JP2003165633A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device capable of improving a jam clearing performance. <P>SOLUTION: This image forming device is provided with a placing base for placing a plurality of sheet materials, raising/lowering means raising/ lowering the placing base, feeding means feeding the placed sheet materials, carrier means carrying the fed sheet materials, pressure-contact means press- contacting the sheet materials to the carrier means, and separating means separating the pressure-contact means from the carrier means. The device is provided with interlocking means operating the separating means by interlocked with the lowering movement of the placing base. <P>COPYRIGHT: (C)2003,JPO

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 provided with a sheet feeding unit for separating and conveying a plurality of stacked sheets one by one.

[0002]

2. Description of the Related Art A conventional image forming apparatus will be described with reference to FIGS. 2, 4, 5, 8 and 9.

In the main body 2 of the image forming apparatus shown in the figure, there is provided a side paper feed deck 201 for separating and feeding a plurality of stacked sheet materials one by one. A storage case 202 capable of storing a plurality of sheet materials is movably supported on the side paper feed deck 201 by slide rails 203, and can be pulled out to the front side outside the apparatus main body 2.

The mounting table 204 on which the sheet material is mounted is supported by a wire 205 and is moved up and down by a drive motor 224. Storage box 2 pulled out of the device body 2
When 02 is inserted into the main body 2, the storage 202 is set on the apparatus main body 2 by the storage lock part 207, and the mounting table 20
4 rises. After that, the paper surface flag 208 comes into contact with and swings to the uppermost paper of the sheet material P on which the paper surface flag 208 is placed, and the paper surface sensor 2
When the sheet material P is detected by 09, the raising of the mounting table 204 is stopped. The sheet material P stored in the storage 202 is fed by the paper feed roller 210 and the transport roller 21.
1. The separation roller 212 guides the apparatus main body 2.

With such a structure, when paper is replenished in the storage box 202 or when a jam occurs in the paper feeding section, when the open / close switch 225 is pressed, the drive motor 224 lowers the mounting table 204 for a predetermined time. After that, the lock solenoid 207a of the storage case lock unit 207 is attracted to release the lock of the storage case 202, and the storage case 202 can be pulled out to the front surface outside the apparatus main body 2. Then, as shown in FIG. 9B, when the storage case 202 is pulled out in the direction of the arrow A from the state in which the storage case 202 is locked to the apparatus main body 2, the release cam 301 fixed to the storage case 202 is separated from the release arm 222. Therefore, the release arm 222 rotates to separate the separation roller 212 from the conveyance roller 211.

[0006]

However, in the above-described conventional example, when the storage case 202 is pulled out while the sheet material P is sandwiched between the conveying roller 211 and the separation roller 212, the operation of pulling out the storage case 202 is interlocked. Release arm 2
22 operates, so that the transport roller 211 and the separation roller 2
The storage box 202 moves before the sheets 12 are separated from each other, and the sheet material P sandwiched therebetween also moves, so that the sheet material P is damaged, and the sheet material P remains in the apparatus main body 2. There was something that happened.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an image forming apparatus capable of improving Jam processability.

[0008]

To achieve the above object, the present invention provides a mounting table for mounting a plurality of sheet materials, an elevating means for elevating and lowering the mounting table, and a stacking of the mounted sheet materials. Feeding means for feeding, feeding means for feeding the fed sheet material, pressure contact means for pressing the sheet material to the feeding means,
An image forming apparatus having a separating means for separating the press contact means from the conveying means is characterized in that interlocking means for operating the separating means in conjunction with the descending operation of the mounting table is provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> Referring to FIG. 2, an automatic document feeder 3 automatically feeds an original document (not shown) to a platen glass 5 on an apparatus main body 2 of a copying machine 1 as an image forming apparatus. The original is scanned by the optical system 6 to form a latent image on the photosensitive drum 9 which is rotatably supported by the drum unit 4 of the image forming unit 7. By developing this latent image, a toner image is formed on the photosensitive drum 9.

A plurality of sheet feeding cassettes 10a, 10b, 10 capable of accommodating a large number of sheet materials P are provided in the apparatus main body 2.
c and 10d are provided, and the sheet material P is fed one by one from the paper feed cassette. Further, the fed sheet material P passes through the vertical path portion 11 and is conveyed to the pre-registration unit 12. Similarly, the side paper feed deck 201
The sheet material P fed from the side paper feed deck 201 passes through the joint path section 224 and is guided to the vertical path section 11.

The sheet material P is skew-corrected by the registration roller pair 13 of the pre-registration unit 12, and then the pre-transfer guide 1
4 is introduced into the image forming section. Therefore, the toner image formed on the photosensitive drum 9 is transferred to the sheet material P by the transfer / separation charger 15 provided in the pre-registration unit 12.
Transcribed on. After that, the sheet material P separated from the photosensitive drum 9 is conveyed to the fixing portion 17 by the conveying portion 16, the toner image on the sheet material P is fixed, and the sheet material P on which the toner image is fixed is discharged to the paper discharging portion 18. Is discharged to the outside of the aircraft.

FIGS. 1, 3, 4, and 5 are views for explaining the details of the side paper feed deck 201 embodying the present invention.

The side paper feed deck 201 has a slide rail 203 provided with a storage box 202 capable of storing a plurality of sheet materials P.
It is movably supported by and can be pulled out to the front side outside the apparatus main body 2. The mounting table 204 on which the sheet material P is mounted is supported by a wire 205, and is vertically moved by rotationally driving the winding pulley 206 by a drive motor 224.

The separating roller 212 is rotatably supported by a pressing arm 213, and the pressing spring 214 presses the separating roller 212 against the conveying roller 211. or,
When a plurality of sheet materials P are delivered by the paper feed roller 210, they are separated one by one by the separation roller 212 and are conveyed by the conveyance roller 210. The gear 215, which is provided coaxially with the winding pulley 206, is connected to the gears 216 and 217 and is similarly rotationally driven by the drive motor 224. The gear 217 and the cam 218 are connected by a torque limiter 219 that transmits only torque equal to or less than a predetermined value.

The first pawl 220 and the second pawl 221 come into contact with the protrusion 218a provided on the cam 218 and contact the cam 21.
8 rotation is restricted. The release arm 222 includes the release spring 2
By swinging the fulcrum 222 around the fulcrum 222a as the shaft rotates along with the rotation of the cam 218, the pressing arm 213 is operated to press and separate the separation roller 212 from the conveyance roller 211.

With such a structure, when the storage box 202 pulled out of the apparatus main body 2 is inserted into the apparatus main body 2, the storage box 202 is set on the apparatus main body 2 by the storage case lock portion 207, and the mounting table 204 is raised. And cam 218
Rotates, the projection 218a hits the second claw 221 and the rotation stops, so that the separation roller 212 is pressed against the transport roller 210.

After that, the paper surface flag 208 contacts and swings with the uppermost paper of the placed sheet material P, and the paper surface sensor 2
When it is detected by 09, the raising of the mounting table 204 is stopped. Then, the sheet material P stored in the storage 202
Is guided to the apparatus main body 2 by the paper feed roller 210 via the conveyance roller 211 and the separation roller 212.

When the open / close switch 225 is pressed when the storage material 202 is replenished with sheet material P or when jam occurs in the side paper feed deck 201, the control means 226 drives the drive motor 224 to load for a predetermined time. While lowering the table 204, the cam 218 is rotated. Cam 21
When the protruding portion 218a hits the first claw 220, the rotation of No. 8 stops, and the release arm 213 separates the separation roller 212 from the transport roller 211. After that, the control means 22
5 is a lock solenoid 207a of the storage lock unit 207
To unlock the storage box 202,
02 can be pulled out to the outside of the apparatus main body 2.

<Second Embodiment> Next, a second embodiment of the present invention will be described.

In the present embodiment, description of the same configuration as that of the first embodiment will be omitted.

6 and 7, the release arm 231 is shown.
Is rotatably supported by a fulcrum 231a, and
The fixed spring 232 abuts the abutting portion 233. When the release solenoid 234 is operated, the release arm 231 rotates to separate the separation roller 212 from the transport roller 211.

With such a structure, when the open / close switch 225 is pressed, the control means 226 causes the release solenoid 234 to operate.
Is operated for a certain period of time, the drive motor 224 is driven, and the mounting table 204 is lowered for a predetermined time. Then, the lock solenoid 207a of the storage lock unit 207 is operated to unlock the storage 202 to store the storage. 202 can be pulled out to the outside of the apparatus main body 2.

In the present embodiment, the separating roller 212 can be separated from the transporting roller 211 before the storage box 202 moves without fail even if the intermediate plate does not move up and down.

[0025]

As is apparent from the above description, according to the present invention, a mounting table for mounting a plurality of sheet materials, an elevating means for raising and lowering the mounting table, and a stacked sheet material are repeated. In the image forming apparatus, there is provided a feeding means for feeding, a conveying means for conveying the fed sheet material, a pressure contact means for press-contacting the sheet material with the conveying means, and a separating means for separating the pressure contact means from the conveying means. Since the interlocking means for operating the means in conjunction with the descending operation of the mounting table is provided, Jam
The effect that the processability can be improved is obtained.

[Brief description of drawings]

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

FIG. 2 is a sectional view of the image forming apparatus according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating drive transmission of the image forming apparatus according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a storage lock unit of the image forming apparatus according to the first embodiment of the present invention.

FIG. 5 is a control system diagram of the image forming apparatus according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram of a sheet feeding unit of the image forming apparatus according to the second embodiment of the present invention.

FIG. 7 is a control system diagram of the image forming apparatus according to the second embodiment of the present invention.

FIG. 8 is a configuration diagram of a sheet feeding unit of a conventional image forming apparatus.

FIG. 9 is a configuration diagram of a paper feeding unit of a conventional image forming apparatus.

[Explanation of symbols]

1 Copier (image forming device) 2 device body 3 Automatic document feeder 4 drum unit 7 Image forming section 10a-10d paper feed cassette 201 Side feed deck 204 mounting table 224 drive motor 210 paper feed roller 211 Conveyor roller 212 Separation roller 223 Release spring 215-217 gears 218 cam 219 Torque limiter 225 open / close switch 226 Control means 234 release solenoid P sheet material

Claims (4)

[Claims] 1. A mounting table for mounting a plurality of sheet materials, an elevating means for elevating and lowering the mounting table, a feeding means for feeding the placed sheet materials, and a conveying means for conveying the fed sheet materials. And a pressing means for pressing a sheet material to the conveying means,
An image forming apparatus comprising: a separating unit that separates a pressing unit from a conveying unit, wherein an interlocking unit that operates the separating unit in conjunction with the descending operation of the mounting table is provided. 2. The image forming apparatus according to claim 1, wherein the separating means retracts from an operating position where the separating means is separated from the conveying means in conjunction with the raising operation of the mounting table. 3. A mounting table for mounting a plurality of sheet materials, an elevating means for elevating and lowering the mounting table, a feeding means for feeding the placed sheet materials, and a conveying means for conveying the fed sheet materials. And a pressing means for pressing a sheet material to the conveying means,
An image forming apparatus, comprising: a separating means for separating the press-contacting means from the conveying means, wherein the control means for operating the separating means by the operation of a switch is provided. 4. The image forming apparatus according to claim 1, wherein the pressing means is a separating means for separating a plurality of sheet materials one by one.