JP2000038245A - Paper ejection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate processing of a discharge roller for transporting a paper at the time of paper discharge and a convex portion for pushing out a rear end of the paper without reducing the paper discharge efficiency, and to reduce the manufacturing cost. To provide a paper discharge device capable of reduction. SOLUTION: A discharge roller 76 for conveying a sheet in a predetermined sheet conveyance direction and an extrusion roller 80 having a convex portion 78 for pushing the rear end of the sheet when discharging the sheet are formed separately.
After the paper discharge roller 76 is fitted to the roller shaft 82 and the polishing process is performed, the extruded sheet 80 formed by stamping an elastic sheet such as rubber formed in a sheet shape is attached to a predetermined position while being elastically deformed. The configuration was adopted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharging device used in an image forming apparatus or the like, and more particularly, to a sheet discharging roller for conveying a sheet when the sheet is discharged, and a convex portion for pushing out the rear end of the sheet. And a paper discharge device.

[0002]

2. Description of the Related Art Conventionally, in an electronic apparatus equipped with an image forming apparatus such as a printer, a copying machine, a facsimile, etc., a sheet discharging apparatus for discharging a sheet subjected to image recording processing or image reading processing to the outside of the apparatus body has been known. In order to improve the sheet discharging efficiency of the sheet, at least one convex portion projecting outward from the peripheral surface thereof is integrally formed with a sheet discharging roller which is transported by rotating while being in contact with the sheet. Then, a sheet is conveyed in a predetermined sheet conveying direction by a sheet discharging roller, and the sheet is discharged by pushing a rear end of the sheet through a convex portion.

FIG. 4A is a plan view showing the appearance of a paper discharge roller member constituting a part of a paper discharge mechanism provided in a conventional paper discharge device of this type, and FIG. 4B is a paper discharge roller. FIG. 4C is a schematic enlarged sectional view cut in parallel with the longitudinal direction of the member and enlarged, and FIG. 4C is a schematic enlarged sectional view cut and enlarged at right angles to the longitudinal direction of the paper discharge roller member. As shown in FIG. 4A, the discharge roller member is a discharge roller 1 that conveys a sheet by rotating while contacting the sheet surface of the sheet.
02 and a plurality of protrusions 10 formed integrally with the end of the paper discharge roller 102 and pushing out the rear end of the paper when the paper is discharged.
4 and a roller shaft 10 that supports the discharge roller 102
6 and a paper discharge drive gear 108 provided at the end of the roller shaft 106 to receive the power of a paper discharge drive motor (not shown).
It is composed of Further, a cutout is formed so as to form a space 110 between the inner peripheral surface of the convex portion 104 and the outer peripheral surface of the roller shaft 106, whereby the convex portion formed integrally with the end of the paper discharge roller 102 is formed. As shown in FIG. 4 (b), an inner peripheral surface near 104 is a roller shaft 106.
It is configured not to abut.

[0004] The paper discharging roller member configured as described above is
When the convex portion 104 receives a pressing force from the paper toward the axial direction of the roller shaft 106 when discharging the paper, the inner portion of the convex portion 104 is
6 is formed so as to partially enter the space 110 formed therebetween, so that unnecessary pressure is not applied to the sheet, so that traces of the convex portions 104 are prevented from being left on the sheet. Excessive deformation of the convex portion 104 is prevented, and the durability of the discharge roller 102 and the convex portion 104 formed integrally with the discharge roller 102 can be improved.

[0005]

However, in such a conventional paper discharging apparatus, after the paper discharging roller 102 is fitted to the roller shaft 106, the paper discharging roller is required to stably discharge the paper. Although the surface of the paper discharge roller 102 where the paper 102 comes into contact with the paper is polished,
2 and the projection 104 are integrally formed, so that the projection 10
4, the surface of the paper discharge roller 102 needs to be polished, resulting in an increase in manufacturing cost. The inner peripheral surface near the convex portion 104 formed integrally with the end of the paper discharge roller 102 is configured such that the roller shaft 106 and the paper discharge roller 102 do not come into contact with each other by providing a space 110. In order to achieve this, it is necessary to process the inside of the discharge roller 102, and as a result, the discharge roller 102
Processing becomes difficult and the cost rises.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a discharge roller for transporting a sheet and a convex portion for pushing out the rear end of the sheet without decreasing the sheet discharge efficiency. It is an object of the present invention to provide a sheet discharge device which facilitates processing and enables reduction in manufacturing cost.

[0007]

According to another aspect of the present invention, there is provided a sheet discharging device configured to contact a paper surface of a sheet and rotate to convey the sheet by rotating the sheet discharging roller;
Having at least one protrusion protruding outward from the peripheral surface,
In a sheet discharging apparatus having an elastic roller that pushes a rear end of a sheet to be discharged by a convex portion, and a roller shaft that supports the discharging roller and the elastic roller, the elastic roller strikes from an elastic sheet. It is characterized by being subjected to blanking and arranged on a roller shaft in parallel with a paper discharge roller.

According to this paper discharge device, a paper discharge roller for transporting the paper by rotating in contact with the paper surface of the paper, and at least one convex portion on the peripheral surface, and An elastic roller that extrudes a rear end by a convex portion is formed separately, and the elastic roller is manufactured by punching an elastic sheet. Therefore, when polishing the surface of the paper discharge roller, there is no need to grind while avoiding a convex portion that pushes out the rear end of the paper, and since the elastic roller is processed by punching the elastic sheet, Processing becomes very easy, and the manufacturing cost can be remarkably reduced.
On the other hand, the elastic roller is disposed on the roller shaft in parallel with the paper discharge roller, so that the rear end of the paper conveyed by the paper discharge roller can be stably pushed out, and the paper can be discharged well. It is possible to do.

Further, in the paper discharging device according to the second aspect, in the paper discharging device according to the first aspect, the elastic sheet is
The thickness is 1 mm to 5 mm.

According to this sheet transporting apparatus, in addition to the effect of the sheet discharging apparatus according to the first aspect, the thickness of the elastic sheet is set to 1 mm to 5 mm. When processing the body roller, the punching of the elastic roller becomes difficult due to the elastic force of the elastic sheet, and the shape of the elastic sheet is not distorted during the punching processing. Can be processed. In addition, the elastic roller processed and assembled to the roller shaft,
The thickness is 1 mm with respect to the longitudinal direction of the roller shaft.
5 mm, the elastic sheet can be easily attached to the roller shaft while elastically deforming the elastic sheet, and does not apply an excessive pressing force to the sheet when the sheet is ejected. The sheet can be discharged without leaving a trace of the copy.

Further, the paper discharge device according to a third aspect of the present invention,
3. The sheet discharging device according to claim 1, wherein
The hole diameter of the elastic roller is smaller than the shaft diameter of the roller shaft.

According to this paper discharge device, in addition to the effect of the paper discharge device according to claim 1 or 2, furthermore, since the hole diameter of the elastic roller is smaller than the shaft diameter of the roller shaft, The elastic roller can be attached to the roller shaft via the elastic force of the elastic roller without providing a locking portion or the like for restricting the displacement of the elastic roller, and in this regard, the manufacturing cost can be reduced. Become.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a perspective view of main components of a facsimile apparatus provided with a sheet discharge device of the present invention. As shown in FIG. 1, the main case of the facsimile apparatus 1 includes a main lower case 1a and a main upper case 1b. The main lower case 1a includes an exposure unit 2, a process unit 3, and a fixing unit 4. And a paper feed unit 5 as a paper feed unit for supplying paper P (see FIG. 2) as a recording medium. Further, the main upper case 1b is provided with a reading unit 6 as a reading unit for reading a document image, a document table 7 on which a read document is placed, and an operation unit 8 for giving various operation instructions. In addition, the main upper case 1b
Is supported on the rear side of the main lower case 1a so as to cover the upper side of the main lower case 1a and to be able to pivot up and down largely. Both the main lower case 1a and the main upper case 1b are made of synthetic resin. It is configured.

The recording drive system unit 9 includes a recording motor and a gear train (not shown), and transmits power to the recording unit 45, the paper supply unit 5, and a paper discharge device 70 (see FIG. 2) described later. Main lower case 1a not shown
Is mounted and fixed in a storage recess provided on the left side of the.

On the other hand, above the bottom cover 10 made of a metal plate which covers the lower surface of the main lower case 1a, the facsimile machine 1
Control board 11 and low-voltage power supply board 1 for controlling various operations of
2. NCU (Network Co.) for enabling conversation and facsimile data transmission / reception with another telephone device or facsimile device via high-voltage power supply board 13 and a telephone line.
ntrol Unit) substrate 14 and the like are provided.

A handset 64 for carrying out a conversation with another telephone device via a telephone line is placed on a receiving stand 65 projecting outward from the left side surface of the main lower case 1a. Is configured.

Next, the details of the reading device and the recording device of the facsimile apparatus 1 configured as described above will be described with reference to the schematic side sectional view of the facsimile apparatus shown in FIG.

First, details of the reading device will be described.
The reading unit 6 provided on the main upper case 1b
A guide member 42 for guiding a document in the document transport direction, and a horizontally long CI provided on the document transport path of the guide member 42.
An image reading scanner 34 composed of an S (Contact Image Sensor); and a separation roller 3 provided near the document table 7.
5, a pair of a document upstream conveyance roller 43 and a document downstream conveyance roller 44 provided in a pair on the upstream side and the downstream side in the document conveyance direction with the image reading scanner 34 interposed therebetween, respectively.
The separation roller 35, a document upstream conveyance roller pair 43, and a reading motor (not shown) that rotationally drives the document downstream conveyance roller pair 44, and the like. The document upstream transport roller pair 43 and the document downstream transport roller pair 44 are
The upper and lower original transport rollers 36 and 39 and the lower and upper original transport rollers 37 and 40 respectively form a pair of upper and lower rollers. The rollers transport the original while nipping the original between these rollers. It is carried out.

The originals placed on the original placing table 7 by the reading device having such a configuration are separated one by one via separation rollers 35, and the original upstream conveying roller pair 43 and the original downstream conveying roller pair 44 are separated. The document is conveyed in the document conveying direction via the document, and the image is read one line at a time in the width direction of the document while being in close contact with the image reading scanner 34 by the document pressing member 38. The lower surface of the document pressing member 38 having a downwardly convex curved shape is formed in white, and is used as a white level reference color when reading a document.

Next, details of the recording apparatus will be described.
The leading end side of the sheets P set in a state of being stacked in the feeder unit case 5a of the sheet supply unit 5 is fed by a support plate 15 urged by an urging spring 15a in the feeder unit case 5a. , And are separated one by one by a paper feed roller 16 and a separation pad 17 which rotate by receiving a driving force from the recording drive system unit 9 (see FIG. 1). The separated paper P is fed to the upper side of the process unit 3 by a pair of upper and lower resist rollers 18 and 19 provided with a pair of upper and lower resists. (Developer) to form an image. Next, the paper P is transferred to the fixing unit 4.
After the toner image is thermally fixed by the heating roller 21 and the pressing roller 22 provided in the fixing unit 4, the sheet ejection driving unit 7 provided in the sheet ejection device 70 is provided.
2 and the paper discharge follower 74,
The paper is discharged from the facsimile machine 1 to the outside of the facsimile machine 1 and discharged to a discharge tray (not shown).

Here, the toner image is provided on a process unit 3 provided substantially at the center of a main lower case 1a having an open top box shape, and on the upper surface side of a bottom plate portion of the main lower case 1a provided below the process unit 3. And an exposure unit 2 fixed with screws or the like to a stay unit integrally formed with the exposure unit 2. The exposure unit 2 is provided with a laser emission unit (not shown), a polygon mirror 23, a plurality of lenses 24, a plurality of reflection mirrors 25, and the like, which are provided on a lower surface side of an upper support plate 2a made of a synthetic resin. And passes through a glass plate 47 that covers a horizontally long scanner hole formed in the upper support plate 2a so as to extend along the axis of the photoconductor drum 26, and on the outer circumferential surface of the photoconductor drum 26 provided in the process unit 3 It is configured to expose a laser beam.

The process unit 3 includes a photosensitive drum 26, a transfer roller 27 that rotates while being in contact with the upper surface of the photosensitive drum 26, and a scorotron-type charger 28 provided below the photosensitive drum 26. A developing device 46 provided with a developing roller 29 and a supply roller 30 provided on the upstream side of the photosensitive drum 26 in the sheet conveying direction.
And a toner cartridge 3 as a toner supply unit provided upstream of the developing device 46 in the sheet transport direction.
1 and a cleaning device 32 provided downstream of the photosensitive drum 26 in the sheet transport direction.

The process unit 3 configured as described above
Then, on the outer peripheral surface of the photosensitive drum 26, the charger 28
An electrostatic latent image is formed on the charged layer formed through the above by scanning the laser beam from the exposure unit 2.

The toner provided in the toner cartridge 31 is agitated by a stirrer (not shown) and discharged, and then is supplied to the developing roller 2 via a supply roller 30.
9 is carried on the outer peripheral surface, and the thickness of the toner layer is made uniform by a blade (not shown). The toner carried on the developing roller 29 adheres to the electrostatic latent image formed on the outer peripheral surface of the photosensitive drum 26, and is then transferred to the paper P passing between the transfer roller 27 and the photosensitive drum 26. By doing
An image is formed on the sheet P using toner. The toner remaining on the photosensitive drum 26 is removed by the cleaning device 32.
Collected via

Further, since the toner cartridge 31 is detachably attached to the process unit 3,
When the toner is insufficient, the toner can be easily replenished by replacing the toner cartridge 31.
Similarly, since the process unit 3 is detachably attached to the main lower case 1a, the photosensitive drum 2
When the device 6 or the like needs to be replaced due to its service life or the like, the device can be maintained only by replacing the process unit 3, so that the configuration is excellent in maintainability.

Next, a paper discharge device 7 for discharging the paper P recorded by the recording device to the outside of the facsimile machine 1
0 will be described with reference to FIGS. 2 and 3. The paper discharge device 70 includes a paper discharge drive 72 driven by the driving force of the recording drive system unit 9 (see FIG. 1) via a gear train (not shown), a paper discharge drive 72 or a paper discharge drive. The sheet P is discharged to the outside of the facsimile apparatus 1 while being pinched by a sheet discharge follower 74 driven via the sheet P conveyed by the sheet 72.

FIG. 3A is a plan view showing the appearance of a paper discharge drive 72 provided in the paper discharge device 70, and FIG. FIG. 3C is an enlarged schematic cross-sectional view in which the sheet is cut at right angles to the longitudinal direction of the paper discharge drive 72 and enlarged. As shown in FIG. 3A, the paper discharge drive 72 is
A discharge roller 76 that conveys the sheet P by rotating while being in contact with the surface of the sheet P, and a convex portion 78 that protrudes outward from the peripheral surface. Extrusion roller 80 extruded by 78, roller shaft 82 supporting discharge roller 76 and extrusion roller 80, and driving force from recording drive system unit 9 (see FIG. 1) provided at the end of roller shaft 82. And a paper discharge drive gear 84 that is driven by the motor.

Here, the extruding roller 80 is formed by punching an elastic body such as rubber formed in a sheet shape having a thickness of 2 mm.
The width W of the extrusion roller 80 with respect to the longitudinal direction of FIG.
Has a width of 2 mm. The hole diameter r (5.5 mm) provided at the center of the extrusion roller 80 is processed so as to be smaller than the shaft diameter R (6.0 mm) of the roller shaft 82.

In the method of manufacturing the paper discharge drive 72 configured as described above, first, a plurality of paper discharge rollers 76 are provided on the roller shaft 82, and the interval between the paper discharge rollers 76 is the pushing roller 80.
Are fitted while providing a predetermined interval so as to have a width W or more. A polishing process is performed on the surfaces of the plurality of paper discharge rollers 76 fitted to the roller shaft 82 while rotating the roller P about the roller shaft 82 in order to stably convey the paper P. After the polishing process is performed, the extruding roller 80 formed by the above-described processing method is elastically deformed from the end of the roller shaft 82, and passes over the paper discharge rollers 76, and between the respective paper discharge rollers 76. After sliding to the position where the provided extruding roller 80 is disposed, the roller shaft 8 is tightened by the tightening force of the hole diameter r of the extruding roller 80 provided smaller than the shaft diameter R of the roller shaft 82.
2 attached.

As described above, since the surface of the discharge roller 76 is polished in a state where the discharge roller 76 is fitted to the roller shaft 82, the extrusion roller 80 is attached to the roller shaft 82. When the surface of the roller 76 is polished, there is no need to polish while avoiding the convex portions 78 provided on the extrusion roller 80, and the processing becomes very easy.

Further, since the extrusion roller 80 is formed by punching an elastic body such as rubber formed in a sheet shape having a thickness of 2 mm, the extrusion roller 80 can be easily processed and has high precision. Processing can be performed.

Further, since the hole diameter r of the extrusion roller 80 is formed smaller than the shaft diameter R of the roller shaft 82, the hole diameter r of the extrusion roller 80 can be surely secured without a member or processing for fixing the extrusion roller 80 on the roller shaft 82. Since it can be fixed on the roller shaft 82, the manufacturing cost can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various improvements and modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, a facsimile apparatus provided with a laser printer has been described as an example of a recording device of a recording device. However, the present invention is not limited to this, and an inkjet printer or a thermal printer may be used as a recording device of the recording device. The same effect can be obtained by using the present invention in an image forming apparatus having such a configuration.

In the present embodiment, the discharge rollers 76
And a roller shaft 82 provided with an extrusion roller 80
In the above-described example, a configuration is provided in which a paper ejection drive gear 84 is provided to receive and drive the driving force from the recording drive system unit 9. However, the configuration is not limited to this, and the paper P or the paper ejection follower 74 may be used. A similar effect can be obtained also in the case of a configuration in which driving is performed by enjoying the above driving force.

Further, in the present embodiment, the paper discharging apparatus for discharging the paper P recorded by the recording apparatus to the outside of the facsimile apparatus 1 has been described as an example, but it is needless to say that the present invention is not limited to this. Needless to say, the same effect can be obtained even when the present invention is applied to a document discharging device that discharges a document read by a reading device.

[0037]

As described above, according to the paper discharge device of the first aspect, when polishing the surface of the paper discharge roller, it is necessary to perform the polishing while avoiding the convex portion that pushes out the rear end of the paper. In addition, since the elastic roller is processed by punching the elastic sheet, the processing is very easy and the manufacturing cost can be remarkably reduced. On the other hand, the elastic roller is disposed on the roller shaft in parallel with the paper discharge roller, so that the rear end of the paper conveyed by the paper discharge roller can be stably pushed out, and the paper can be discharged well. It is possible to do.

Further, according to the sheet discharging device of the second aspect, in addition to the effect of the sheet discharging device of the first aspect, furthermore,
When the elastic roller is processed by punching the elastic sheet, the punching of the elastic roller becomes difficult due to the elastic force of the elastic sheet. It can be easily processed without distorting the shape. Further, since the elastic roller processed and assembled to the roller shaft has a thickness of 1 mm to 5 mm with respect to the longitudinal direction of the roller shaft,
The elastic sheet can be easily attached to the roller shaft while elastically deforming the sheet.It does not apply excessive pressing force to the sheet when ejecting the sheet, and removes the sheet without leaving any trace of the convex portion on the sheet. Paper can be discharged.

According to a third aspect of the present invention, in addition to the effects of the first and second aspects of the paper discharging apparatus, furthermore, the paper discharging apparatus restricts the displacement of the elastic roller on the roller shaft. It can be attached to the roller shaft via the elastic force of the elastic roller without providing a stop or the like. In this regard, it is possible to reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of main components of a facsimile apparatus including a sheet discharge device according to an embodiment.

FIG. 2 is a schematic side sectional view of the facsimile apparatus.

FIG. 3 is an explanatory diagram of a paper discharge drive provided in the paper discharge device.

FIG. 4 is an explanatory diagram of a paper discharge roller member provided in a conventional paper discharge device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Facsimile machine 72 Discharge drive 76 Discharge roller 78 Convex part 80 Extrusion roller 82 Roller shaft

Claims (3)

[Claims] 1. A sheet discharge roller for conveying a sheet by rotating while being in contact with a sheet surface of the sheet, and at least one protrusion projecting outward from a peripheral surface,
In a paper discharge device having an elastic roller that pushes a rear end of the discharged paper by a convex portion, and a roller shaft that supports the discharge roller and the elastic roller, the elastic roller includes an elastic member. A sheet discharging device which is punched from a sheet and is arranged on the roller shaft in parallel with the sheet discharging roller. 2. The elastic sheet has a thickness of 1 mm.
2. The sheet discharge device according to claim 1, wherein the distance is from 5 mm to 5 mm. 3. The roller according to claim 1, wherein a hole diameter of the elastic roller is smaller than a shaft diameter of the roller shaft.
Or the sheet discharging device according to claim 2.