JPH08225184A - Sheet conveying device and image forming device - Google Patents

Abstract

PURPOSE: To provide a sheet conveying device in which a sheet failed in conveyance can be easily taken away. CONSTITUTION: A sheet conveying device is provided with plural conveying roller pairs 41, 42, 43, 44 whose driving systems are different from each other, and a knob 41a serving as a rotating means rotating the first conveying roller pair 41 via the first one-way clutch 41c is arranged in the first conveying roller pair 41 among the plural conveying roller pairs. The rotation by means of the knob 41a is transmitted to the second conveying roller pair 42, whose driving system is different from that of the first conveying roller pair 41, via the second one-way clutch 42c by means of the first pulley 41d, the second pulley 42d, and a belt 41e serving as drive transmitting means.

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, a facsimile or a printer, and more particularly to a sheet conveying apparatus applied to the image forming apparatus.

[0002]

2. Description of the Related Art A sheet conveying device applied to an image forming apparatus such as a copying machine, a facsimile, a printer, etc. will be described with reference to FIG.

FIG. 8 is a sectional view showing the overall construction of a copying machine A as an image forming apparatus to which a conventional sheet conveying apparatus 101 is applied.

In FIG. 8, a copying machine A'is based on an electrophotographic system, and an image of a document placed on a document placing section 170 is sensed by an optical system 180 in a photosensitive drum 131 in an image forming section 130 as an image forming means. Image.

The sheet S'includes cassettes 151, 152,
Sheets S ′ selected by the user or the apparatus are separately loaded on the sheets 153 and 154 by size, material, and the like, and are conveyed to the image forming unit 130 via the supply conveying unit 150.

The sheet S'conveyed is transferred to the image forming unit 1
The image is transferred at 30, and the image is fixed by the fixing unit 132, and is normally discharged to the discharge tray 160.

In this way, the sheet S ′ is discharged onto the discharge tray 160.
When the flapper 133 is in the position indicated by the broken line, it is conveyed to the sheet conveying device 101 on the downstream side thereof and the intermediate tray 1 is discharged.
The sheet S ′ is placed on 10.

Particularly, in this copying machine A ', an intermediate tray 110 is provided to enable double-sided image formation and multiple image formation.

FIG. 9 is a plan view of the double-sided conveyance section 140 provided at the bottom of the intermediate tray 110 when it is pulled out from the copying machine A '.

In FIG. 9, conveying roller pairs 141, 14
2, 143 and 144 are arranged in the same plane, and the four conveying roller pairs 141, 142, 143 and 144 are arranged.
Among them, the first transport roller pair 141 has an independent drive system (not shown), and the second transport roller pair 142, the third transport roller pair 143, and the fourth transport roller pair 144 are provided at the ends. It is connected by a pulley and a belt, and is driven by a drive system (not shown) different from the first conveying roller pair 141
It is a structure that is driven simultaneously.

Also, the first conveying roller pair 141 and the second conveying roller pair 141
The conveying rollers 142 are provided with knobs 141a and 142a as rotating means, respectively. When the knobs 141a are rotated, the first conveying roller pair 141 is rotated and the knobs 142 are rotated.
When a is turned, the second conveying roller 142 and the third conveying roller pair 1
43 and the fourth conveying roller pair 144 are rotated together by the pulley and the belt provided at the end.

[0012]

However, the above-mentioned conventional example has the following problems.

When the sheet S'is not properly conveyed by the double-sided conveying section 140, the user first turns the knob 141a of the first conveying roller pair 141 on the downstream side to cause the double-sided conveying section 14 to move.
The sheet S ′ on the downstream side of 0 is further transported to the downstream side.

Next, the knob 142a of the second conveying roller pair 142 located on the upstream side of the double-sided conveying section 140 is rotated to rotate both the third conveying roller pair 143 and the fourth conveying roller pair 144, and the upstream side of the double-sided conveying section 140. The sheet S ′ on the side is conveyed to the downstream side.

Subsequently, the knob 141a of the downstream first transport roller pair 141 is rotated again to transport the sheet S'on the downstream side of the double-sided transport section 140 to the further downstream side.

For example, the knob 1 is provided before the knob 141a.
When the sheet 42 'is rotated, the sheet S'on the downstream side interferes with the sheet S'on the upstream side, and the sheet S'cannot be conveyed even if the knob 142a is rotated.

As described above, the user has two knobs 14
While paying attention to 1a and 142a, the sheet S'of the double-sided conveyance section 140 was removed by spending a great deal of man-hours.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a sheet conveying apparatus capable of easily removing a sheet having a conveyance failure. .

[0019]

In order to achieve the above object, according to the present invention, in a sheet conveying apparatus having a plurality of conveying roller pairs having different driving systems, a first conveying of the plurality of conveying roller pairs is performed. The roller pair is provided with a rotating means for rotating the first conveying roller pair via the first one-way clutch, and the rotation by the rotating means is applied to the second conveying roller pair having a drive system different from that of the first conveying roller pair to the second one-way clutch. Drive transmission means for transmitting the transmission through

In a sheet conveying apparatus having a plurality of conveying roller pairs having different drive systems, a rotating means for rotating the first conveying roller pair via the first one-way clutch to the first conveying roller pair among the plurality of conveying roller pairs. And a plurality of drive transmitting means for transmitting the rotation by the rotating means to a plurality of conveying roller pairs having a drive system different from that of the first conveying roller pair via a one-way clutch, respectively.

[0021]

In the sheet conveying device configured as described above,
A rotation means for rotating the first conveyance roller pair via a first one-way clutch is provided for the first conveyance roller pair among the plurality of conveyance roller pairs, and the rotation by this rotation means is different from that of the first conveyance roller pair in the drive system. Since the drive transmission means for transmitting to the second conveying roller pair via the second one-way clutch is provided, by rotating one rotating means, a plurality of conveying roller pairs having different drive systems are rotated.

Of the plurality of conveying roller pairs, the first conveying roller pair is provided with a rotating means for rotating the conveying roller pair via the first one-way clutch, and the rotation by the rotating means is formed by a drive system with respect to the first conveying roller pair. By providing a plurality of drive transmission means for transmitting to each of a plurality of different conveyance roller pairs via the one-way clutch, by rotating one rotation means, a plurality of conveyance roller pairs having different drive systems are rotated.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

(First Embodiment) In this embodiment, a copying machine will be described.

FIG. 1 is a sectional view showing the overall construction of a copying machine A as an image forming apparatus of this embodiment.

In FIG. 1, a copying machine A is of an electrophotographic type, and an original image placed on an original placing portion 70 is transferred by an optical system 80 onto a photosensitive drum 31 in an image forming portion 30 as an image forming means. Form an image.

The sheet S includes cassettes 51, 52, 53,
The sheets S are separately stacked in size, material, and the like, and the sheets S selected by the user or the apparatus are transported to the image forming unit 30 via the supply transport unit 50.

The conveyed sheet S is transferred to the image forming unit 30.
Then, the image is fixed by the fixing unit 32, and is normally discharged to the discharge tray 60.

The sheet S is discharged to the discharge tray 60 in this way when the flapper 33 is at the position shown by the broken line, and when it is at the position shown by the solid line, it is transferred to the sheet conveying device 1 on the downstream side. The sheet S is conveyed and placed on the intermediate tray 10.

Particularly, in this copying machine A, double-sided image formation,
An intermediate tray 10 is provided to enable multiple image formation.

FIG. 2 is a plan view of the double-sided conveyance section 40 provided at the lower portion of the intermediate tray 10 when it is pulled out from the copying machine A ′, and FIG. 3 is a configuration diagram of the double-sided conveyance section 40.

In FIG. 2 and FIG. 3, a pair of transport rollers 4
1, 42, 43, 44 are arranged on the same plane,
Of the four conveyance roller pairs 41, 42, 43, 44, the first conveyance roller pair 41 has a first clutch 41b as an independent drive system, and the second conveyance roller pair 42,
The conveying roller pair 43 and the fourth conveying roller pair 44 are connected by a pulley and a belt provided at the ends, and three of them are simultaneously driven by a second clutch 43b which is a drive system different from the first conveying roller pair 41. It is a configuration that is done.

In this embodiment, the first clutch 41b and the second clutch 43b are both driven by the motor M. Of course, it may be configured to be driven by different motors.

The second clutch 43b for driving the second conveying roller pair 42, the third conveying roller pair 43, and the fourth conveying roller pair 44 is provided at the end of the third conveying roller pair 43, but is not limited to this. Instead, the second transport roller pair 42 and the fourth transport roller pair 44 may be used.

Further, the first one-way clutch 41 is provided at the end of the first conveying roller pair 41 opposite to the first clutch 41b.
A knob 41a is provided via c, and this knob 41a
By rotating the first conveying roller pair 41 to the sheet S.
However, the rotation of the first conveying roller pair 41 by the first clutch 41b is not limited to the knob 41.
It does not transmit to a.

Further, the second conveying roller pair 42 also has the second one-way clutch 4 at the end opposite to the second clutch 43b.
2c is provided, and the first pulley 41 as a drive transmission means is provided.
d, the second pulley 42d and the belt 41e are connected to the knob 41a of the conveying roller pair 41.
By rotating 1a, the second conveying roller pair 42 can be rotated in the conveying direction of the sheet S, but the rotation of the second conveying roller pair 42 by the second clutch 42b is not transmitted to the knob 41a side. ing.

With this configuration, the knob 41a
When the sheet S is rotated in the sheet S conveying direction, not only the first sheet conveying roller pair 41 but also the second sheet conveying roller pair 42, the third sheet conveying roller pair 43, and the fourth sheet conveying roller pair 44 are rotated in the sheet S conveying direction. It will be.

As a result, if the sheet S becomes poorly conveyed and a jam or the like occurs in the double-sided conveying section 40, the jammed sheet S can be conveyed and discharged simply by rotating the knob 41a.

FIG. 4 is a schematic view showing the conveyance state of the sheet S in the double-sided conveyance section 40, which will be described below.

In FIG. 4, a sensor 45 is provided upstream of the first transport roller pair 41, a sensor 46 is provided immediately downstream of the second transport roller pair 42, and immediately downstream of the fourth transport roller pair 44. Sensors 47 are provided on the respective sides, and the sheet S ′ can be detected at the respective positions of these sensors 45, 46, 47.

For example, when the sheet S is fed from the cassette 52 shown in FIG. 1, when the carrying operation is started,
First, it is detected by the sensor 46. After the sheet S is detected, the leading end hits the second transport roller 42, a loop is formed, and skew feeding correction is performed. Then, after a predetermined time, the second clutch 43b is driven and the second transport roller 42
And then the first clutch 41b is driven,
It is transported by the first transport roller 41.

Next, the sheet S ₂ placed in the intermediate tray 10 is conveyed and, for example, as shown in FIG. 4A, the sheet S ₂ does not reach the sensor 46 within a predetermined time and is not detected. When a jam occurs, the second clutch 43b stops driving, and the second conveying roller pair 42 and the third conveying roller pair 4
Since the rotation of the third and fourth conveying roller pairs 44 is stopped,
Sheet S ₂ is stopped, the sheet S ₁ on the upstream side of the sheet S ₂ is driven by the first clutch 41b, and is conveyed by the first conveying roller 41. Therefore, the waste of the sheet S is eliminated.

Further, the sheet S ₃ placed on the intermediate tray 10 is conveyed and, for example, as shown in FIG. 4B, the sheet S ₃ does not reach the sensor 45 within a predetermined time and is not detected. In the case of, the driving of both the first clutch 41b and the second clutch 43b is stopped, and the "right door 73, front door 7" is displayed on the display unit 71 in the perspective view of the copying machine A shown in FIG.
Please open 2. Is displayed, and when it is opened as shown in FIG. 5, this time, "Please rotate the knob (41a)." Is displayed, and when the knob 41a is rotated, as described above, all the (four) conveyance roller pairs 41 are conveyed. , 42, 43, 44 rotate, the sheet S ₃ is ejected as shown in FIG. 4C, and is removed by the user.

Further, if the knob 41a is continuously rotated, the sheet S ₄ on the downstream side cannot be detected by the sensor 47. In this state, the sheet S ₄ can be pulled out without being broken even when the double-sided conveying section 40 is pulled out. , "Please pull out both sides conveyance part (40)." Is displayed, and Fig. 6
As shown in FIG. 5, the user can pull out the double-sided conveyance section 40 and smoothly remove the sheet S ₄ .

The sheet S ₄ on the downstream side has a knob 41a.
Although it can be discharged by continuing to rotate, usually follow the indication of "Please pull out the double-sided conveyance section (40)" to smooth the jam processing.

In this embodiment, a plurality of conveying roller pairs using two drive systems have been described, but the present invention is not limited to this, and the same applies to a system using three, four or more drive systems. By using the one-way clutch and the drive transmission means, all the conveying roller pairs can be rotated by one knob (rotating means).

Furthermore, in this embodiment, the first pulley 41d, the second pulley 42d, and the belt 41e are used as the drive transmission means, but the present invention is not limited to this, and similar effects can be obtained with gears, gears and chains, etc. To be

(Second Embodiment) FIG. 7 is a plan view showing a second embodiment of the present invention in a state where a double-sided conveyance section 40 is pulled out.

Before describing FIG. 7, the drawbacks of FIG. 6 will be described below.

In FIG. 6, a cover 48 supporting four pairs of transport rollers 41, 42, 43, 44 is provided on the upper surface of the double-sided transport section 40, and a window 49 is provided in this cover 48.

At the time of the jam treatment shown in the above-mentioned first embodiment, the double-sided conveying section 40 is pulled out from the copying machine A, but at this time, the position of the sheet S inside cannot be confirmed by the cover 48, so that A window 49 is provided on the cover 48, but it is difficult to confirm because the window 49 is small.

If the window 49 is made larger, the sheet S can be confirmed, but when the sheet S is conveyed, the leading end is caught by the frame of the window 49 and becomes a jam.

In the second embodiment, as shown in FIG.
The cover 48 'supporting the four conveying roller pairs 41, 42, 43, 44 is made of a transparent member, and the sheet S
In addition to facilitating the confirmation of the position of the sheet, the window 49 is not necessary, the sheet S is not caught when being conveyed, and a jam can be prevented.

[0054]

As described above, according to the present invention,
A rotation means for rotating the first conveyance roller pair via a first one-way clutch is provided for the first conveyance roller pair among the plurality of conveyance roller pairs, and the rotation by this rotation means is different from that of the first conveyance roller pair in the drive system. Since the drive transmitting means for transmitting to the second pair of conveying rollers via the second one-way clutch is provided, by rotating one rotating means, it is possible to rotate a plurality of pairs of conveying rollers having different drive systems, resulting in poor conveyance. It is possible to easily transport and discharge the sheet.

A rotating means for rotating the first conveying roller pair through a first one-way clutch is provided for the first conveying roller pair among the plurality of conveying roller pairs, and the rotation by the rotating means drives the first conveying roller pair. By providing a plurality of drive transmission means for transmitting via a one-way clutch to a plurality of transport roller pairs having different systems, it is possible to rotate a plurality of transport roller pairs having different drive systems by rotating one rotating means. It is possible to easily convey and eject a sheet that has become defective in conveyance.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a double-sided conveyance section applied to the sheet conveying apparatus according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a double-sided conveyance unit of the present invention.

4 (a), (b), and (c) are schematic views showing a sheet conveyance state in a double-sided conveyance section of the present invention.

FIG. 5 is a perspective view showing an image forming apparatus of the present invention.

FIG. 6 is a plan view showing a state in which a double-sided conveyance unit is pulled out from the image forming apparatus according to the first embodiment of the present invention.

FIG. 7 is a plan view showing a state in which a double-sided conveyance section is pulled out from the image forming apparatus according to the second embodiment of the present invention.

FIG. 8 is a schematic diagram showing an overall configuration of a conventional image forming apparatus.

FIG. 9 is a plan view showing a double-sided conveyance section applied to a conventional sheet conveyance device.

[Explanation of symbols]

 A copy machine (image forming apparatus) S, S'sheet 1,101 sheet conveying device 10,110 intermediate tray 30,130 image forming unit (image forming means) 40,140 double-sided conveying unit 41,141 first conveying roller pair 41a , 141a Knob (rotating means) 41b First clutch 41c First one-way clutch 41d First pulley (drive transmission means) 41e Belt (drive transmission means) 42,142 Second conveying roller pair 42c Second one-way clutch 42d Second pulley ( Drive transmission means) 43,143 third conveying roller pair 43b second clutch 44,144 fourth conveying roller pair 48,48 'cover

Claims (3)

[Claims] 1. A sheet conveying device having a plurality of conveying roller pairs having different drive systems, wherein a first conveying roller pair is a first one of the plurality of conveying roller pairs.
Rotating means for rotating the first conveying roller pair via the one-way clutch is provided, and the rotation by the rotating means is applied to the second conveying roller pair whose drive system is different from that of the first conveying roller pair.
A sheet conveying device, characterized in that a drive transmitting means for transmitting through a one-way clutch is provided. 2. A sheet conveying apparatus having a plurality of conveying roller pairs having different drive systems, wherein a first conveying roller pair is a first one of the plurality of conveying roller pairs.
A plurality of rotating means for rotating the first conveying roller pair via the one-way clutch are provided, and a plurality of rotations transmitted by the rotating means are transmitted to the plurality of conveying roller pairs each having a different drive system from the first conveying roller pair via the one-way clutch. 2. A sheet conveying device, characterized in that the drive transmitting means is provided. 3. An image forming apparatus, comprising: the sheet conveying apparatus according to claim 1; and an image forming unit that forms an image on a sheet.