JPH06156798A - Sheet transport device - Google Patents

Abstract

PURPOSE:To prevent the generation of the trouble such as jam and skew in the transport of a sheet, as for a sheet transport device for supporting one between a pair of transport rollers by an opening/closing cover. CONSTITUTION:An opening/closing cover supports one roller 36 of a pair of before-read-out transport rollers 36 and 37 through a slidable roller holding member and one roller 40 between a pair of after-read-out transport rollers 40 and 41. The other rollers 37 and 41 are held at the prescribed positions by the respective bearing members 60. On the respective bearing members 60, the engagement recessed parts 60b with which the roller shafts 36a and 40a of the rollers 36 and 40 are engaged when the opening/closing cover is closed is installed. When the rollers 36 and 40 are engaged with the engagement recessed parts 60b, the relative positions of the rollers 36 and 40 for the rollers 37 and 41 are set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a sheet conveying device that is provided in a copying machine, a facsimile machine, a printing machine, or the like and that conveys a sheet through a sheet conveying path with a pair of conveying rollers.

[0002]

2. Description of the Related Art Conventionally, in this type of sheet conveying apparatus, there is one in which a pair of conveying rollers are arranged with a sheet conveying path sandwiched therebetween and one of the pair of conveying rollers is supported by an opening / closing cover. Then, while the sheet is conveyed through the sheet conveying path by the pair of conveying rollers, at the time of conveying the sheet, when a trouble such as a jam occurs in the sheet conveying path, the opening / closing cover is opened to separate the pair of conveying rollers, The sheet conveyance path was opened to facilitate trouble handling.

[0003]

However, in such a conventional sheet conveying apparatus, as shown in FIG. 6, for example, one conveying roller 1 of a pair of conveying rollers 1 and 2 has a predetermined line shown by a solid line with respect to the other. When the sheet is attached at a position deviated from the position, the sheet conveying direction is also deviated from the predetermined direction a to the chain line direction b, which causes a jam or the like during the sheet conveying. Further, if the pair of conveying rollers 1 and 2 are attached so as to be offset in the longitudinal direction of the sheet in the sheet conveying direction (i), the troubles such as skewing of the sheet have occurred.

Therefore, it is an object of the present invention to prevent the occurrence of troubles such as jams and skews during sheet conveyance in such a sheet conveying apparatus.

[0005]

Therefore, the present invention provides
For example, as shown in the following illustrated embodiment, a pair of, for example, pre-reading conveyance rollers 3 sandwiching the sheet conveyance path 29.
6.37 and post-reading conveyance rollers 40 and 41 are arranged, and the pair of conveyance rollers conveys a sheet such as a sheet P or a document G through the sheet conveyance path 29, and the pair of conveyance rollers. One of the rollers, for example, the pre-reading conveyance roller 36 and the post-reading conveyance roller 40 is supported by an opening / closing cover 31, and the opening / closing cover 31 is opened to separate the pair of conveying rollers so that the sheet conveying path 29 can be opened. In the sheet conveying device 20, when the opening / closing cover 31 is closed, one of the pair of conveying rollers, for example, the roller shafts 36a and 40a are engaged, and the other of the pair of conveying rollers, for example, the pre-reading conveying roller 37 and the post-reading conveying. Bearing member 60 that determines the relative position with the roller 41
The other of the pair of conveying rollers is attached to the positioning member as described above, and is provided.

According to a second aspect of the present invention, for example, as shown in the following illustrated embodiment, in the sheet conveying device 20 of the first aspect, a roller holding member 50 is slidably provided on the opening / closing cover 31, and Roller holding member 50
An urging member such as a leaf spring 51 is attached to urging the bearing 53 with the urging member, and the roller holding member 50 rotatably holds one of the pair of conveying rollers via the bearing 53. It is characterized by that.

According to a third aspect of the present invention, for example, as shown in the following illustrated embodiment, in the sheet conveying device 20 of the first aspect, the positioning member is provided with the other of the pair of conveying rollers, for example, a roller shaft. 37a and 41a are provided with fitting holes 60a, and one of the roller shafts 36a and 40a, for example, is provided with an engaging recess 60b with which the roller shafts 36a and 40a are removably engaged.

[0008]

When the opening / closing cover 31 is closed, one roller shaft of the pair of conveying rollers engages with the positioning member to determine the relative position with the other conveying roller.

According to the second aspect of the present invention, for example, when the relative position of one of the pair of conveying rollers to the other is misaligned, when the roller shaft of one of the pair of conveying rollers engages with the positioning member, The holding member 50 is slid to determine the relative position of one conveyance roller with the other. And
One of the pair of conveyance rollers is pressed against the other via the bearing 53 by the urging member.

According to the third aspect of the present invention, when the relevant position is set and the opening / closing cover 31 is closed, one roller shaft of the pair of conveying rollers is removably engaged with the engagement recess 60b.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows a schematic configuration of a facsimile equipped with a sheet conveying apparatus according to an embodiment of the present invention.

Reference numeral 10 in the drawing denotes a facsimile main body. Inside the facsimile main body 10, a drum-shaped photosensitive member 11 is provided at substantially the center. Around the photoconductor 11, in order from the lower charger 12 to the rotation direction (counterclockwise) of the photoconductor 11, the developing unit 13 is on the right side and the transfer unit 1 is on the upper side.
4. A cleaning device 15 is arranged on the left side. An optical writing device 16 is provided below the charging device 12 and the developing device 13. A fixing device 17 is provided on the left side of the transfer device 14. Thus, the recording portion R is formed as a whole. Further, a paper feed cassette 18 accommodating the paper P is provided below the recording unit R, and an original placing table 19 is attached to the front side (right side in the drawing) of the facsimile body 10. Then, on the right side of the recording unit R, the paper P in the paper feed cassette 18 and the document table 19 are placed.
A sheet conveying device 20 for conveying the upper originals G is provided.

In the illustrated facsimile, however, for example, when image information is transmitted from the other party, the paper P is fed from the paper feed cassette 17 by the paper feed roller 23, is fed in the direction of arrow A through the lower transport path 24, and the sheet is further fed. The sheet is conveyed by the conveying device 20 and sent to the recording unit R through the upper conveying path 25.

On the other hand, the surface of the photosensitive member 11 is uniformly charged by the charger 12 while rotating counterclockwise in FIG.
Next, laser light is irradiated by the optical writing device 16 according to the received content to form an electrostatic latent image on the surface thereof, and then the developing device 13
When passing through the position, the electrostatic latent image is sequentially visualized by toner. Then, the visible image is transferred to the paper P by the transfer device 14.
Transfer to. After the transfer, the paper P after the transfer is fixed by the fixing device 17
And the transferred image is fixed by the fixing device 17. After the image is fixed, the paper P is discharged onto the paper discharge unit 27 by the paper discharge roller 26. On the other hand, the surface of the photoconductor 11 has a cleaning device 1
Clean at 5.

By the way, the above-described sheet conveying device 20.
As shown in FIG. 5, the sheet conveying path 29 is formed by connecting the lower conveying path 24 and the upper conveying path 25. Then, the portion above the sheet conveying path 29 is supported by the opening / closing cover 31. The open / close cover 31 is provided so as to be openable / closable around the support shaft 32.

Further, the sheet conveying device 20 is provided with a document insertion port 10a having a document mounting table 19 attached to the right end of the sheet conveying path 29. Then, the document insertion port 10a
The original separation roller 34 is supported on the lower side with the sheet sandwiched therebetween, and the separation pad 35 is supported on the upper opening / closing cover 31 and pressed against the original separation roller 34. Therefore, in the middle of the sheet conveying path 29 where the document insertion opening 10a and the lower conveying path 24 join, a pair of pre-reading conveying rollers 3 are sandwiched therebetween.
Place 6 and 37. The pair of pre-reading conveyance rollers 36
One roller 36 of 37 is supported by the upper cover 31 and the other roller 37 is supported within the facsimile body 10. Then, the pair of pre-reading conveyance rollers 36
On the left side of 37, the document reading unit 38 is provided in the main body 30 of the conveying device, while the document pressing roller 39 is supported by the opening / closing cover 31, and the document pressing roller 39 is in contact with the document reading surface of the document reading unit 38. . Further, on the left side, the sheet conveying path 2
A pair of post-reading conveyance rollers 40 and 41 are arranged with 9 in between. One roller 40 of the pair of post-reading conveyance rollers 40 and 41 is supported by the opening / closing cover 31, and the other roller 41 is supported inside the facsimile main body 10.

Further, in the sheet conveying device 20, a pair of original sheet discharge rollers 42 and 43 are arranged on the left side of the pair of post-reading conveying rollers 40 and 41 with the sheet conveying path 29 interposed therebetween. One roller 42 of the pair of document discharge rollers 42 and 43 is supported by the opening / closing cover 31, and the other roller 43 is supported inside the facsimile main body 10. Furthermore, on the left side of the pair of document discharge rollers 42 and 43, a pair of registration rollers 44 and
45 is arranged. The pair of registration rollers 44 and 45
One roller 44 is supported by the opening / closing cover 31, and the other roller 45 is supported inside the facsimile body 10.

Therefore, in the sheet conveying device 20, the open / close cover 31 is provided with the upward document discharge port 31a in front of the registration roller 44 on the right side thereof. A switching claw 47 for conveying direction is rotatably attached to the document discharge port 31a.

In the sheet transporting device 20, one of the pair of pre-reading transport rollers 36 and 37 and the pair of post-reading transport rollers 40 and 41 is used as one of the transport rollers 36 and 40.
Both are supported by the opening / closing cover 31 via the roller holding member 50. As shown in FIGS. 4 and 3, the roller holding member 50 has a flat plate portion 50a.
Bent plate portions 50b facing downward are formed on the front and rear sides of the sheet conveyance direction B at both edges of a. And the flat plate portion 50a
Is provided with a plurality of elongated holes 50c, and each bending plate portion 50b is provided with a hole 50d. Further, leaf springs 51 (biasing members) are attached to the lower surface of the flat plate portion 50a at both ends thereof. Then, a bearing 53 is movably engaged with each hole 50d of the bending plate portion 50b up and down in the drawing, and the bearing 53 is engaged with the roller shafts 36a and 40a of one of the conveying rollers 36 and 40, respectively.
And one of the conveying rollers 36 and 40 is passed through the bearing 53.
It is rotatably held by the roller holding member 50 via. Then, the leaf spring 51 is pressed against the bearing 53, and the bearing 5
Each of the conveying rollers 36 and 40 is urged downward via the roller 3. Then, each elongated hole 50c of the flat plate portion 50a
The stepped screws 52 are screwed into a plurality of positioning protrusions (not shown) provided on the inner surface of the opening / closing cover 31 correspondingly. Then, the roller holding member 50 is slidably provided on the opening / closing cover 31.

On the other hand, the other reading / conveying rollers 37 and 41
Respectively, as shown in FIG.
It is held at a predetermined position by a bearing member (positioning member) 60 provided inside. Each bearing member 60 is provided with a fitting hole 60a on the lower side and an engaging recess 60b on the upper side. The engagement concave portion 60b is formed in a shape in which the upper side thereof is gradually widened. And the roller shaft 37a-4
1a is fitted into the fitting hole 60a, and the other conveying rollers 37 and 41 are rotatably held by the bearing member 60. Then, when the opening / closing cover 31 is closed as shown in FIG. 5, the roller shafts 36a.
0a are respectively engaged with the engaging recesses 60b of the bearing member 60, and one of the conveying rollers 36 and 40 is connected to the other conveying roller 3
The position relative to the other is determined according to the predetermined position of 7 ・ 41.

Now, when transmitting the image information of the document G to the other party by the above-mentioned illustrated facsimile, as shown in FIG. 5, the switching claw 47 is rotated to the position shown by the dotted line to switch the carrying direction. The original G is inserted from the original table 19 into the original insertion port 10a, and the original G is separated by the original separation roller 34 and the separation pad 35 and fed one by one.
Then, the pair of pre-reading conveyance rollers 36 and 37 feeds the original G to the original reading section 38, conveys the original G on the original reading section 38 while pressing the original pressing roller 39, and at the same time, the original reading section 38 moves the original G on the original G. Read image information. Then, after the image is read, a pair of the original G is read and the conveying rollers 40, 4
The sheet is conveyed by 1 and is discharged from the document discharge port 31a by the pair of document discharge rollers 42 and 43.

Further, in the sheet conveying apparatus 20 of the present invention, when the original G is conveyed and a jam occurs in the sheet conveying path 29, for example, as shown in FIG. Conveyor rollers 36, 37, 40
41 and original document discharge rollers 42 and 43 and registration roller 4
4.45 and the like are separated and the sheet conveying path 29 is opened.
Then, the jam processing is facilitated.

However, after the jam is removed, the opening / closing cover 31
And the pair of reading / conveying rollers 36, 37, 4 when closed.
Roller shaft 36a of one roller 36, 40 of 0.41
40a engages with the engaging recesses 60b of the bearing member 60, respectively. Then, the relative position of each of the rollers 36 and 40 with the other of the rollers 37 and 41 is determined. That is, at that time, if there is a deviation in this relational position, the one roller 36, 40 slides together with the roller holding member 50 by the amount of the deviation, and the one roller 36, 40 moves.
The relative position of each of the other rollers 37 and 41 is determined.

[0024]

Therefore, according to the present invention, in the sheet conveying apparatus in which one of the pair of conveying rollers is supported by the opening / closing cover, when the opening / closing cover is closed, one roller shaft of the pair of conveying rollers is positioned by the positioning member. Since the position relative to the other of the pair of transport rollers is determined by the engagement with the other of the pair of transport rollers, the position relative to the other of the pair of transport rollers is prevented from being displaced. It is possible to prevent a trouble from occurring.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a pair of pre-reading conveyance rollers, a pair of post-reading conveyance rollers, and a bearing member included in a sheet conveying apparatus that is an embodiment of the present invention.

FIG. 2 shows a facsimile equipped with the sheet conveying device,
It is a schematic block diagram which opens and shows an opening / closing cover.

FIG. 3 is a support state diagram of one roller of a pair of pre-reading conveyance rollers included in the sheet conveyance device.

FIG. 4 is an exploded perspective view of a roller holding member of the sheet conveying device and components attached to the roller holding member.

5 is a schematic configuration diagram showing the facsimile machine shown in FIG. 2 with an opening / closing cover closed.

FIG. 6 is an explanatory diagram showing a relative position of one of a pair of conveyance rollers with respect to the other of the pair of conveyance rollers and a state of deviation thereof.

[Explanation of symbols]

 20 Sheet Conveying Device 29 Sheet Conveying Path 31 Opening / Covering Cover 36/37 Pre-Reading Conveying Roller (Conveying Roller) 36a Roller Shaft of One Pre-Reading Conveying Roller 37a Roller Shaft of Another Pre-Reading Conveying Roller 40/41 Post-Reading Conveying Roller ( Transport roller) 40a Roller shaft of one transport roller after reading 41a Roller shaft of the other transport roller after reading 50 Roller holding member 51 Leaf spring (biasing member) 53 Bearing 60 Bearing member (positioning member) 60a Fitting hole 60b Matching recess P Paper (sheet) G Original (sheet)

Front page continuation (72) Inventor Satoshi Narumi 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (3)

[Claims] 1. A pair of conveying rollers are arranged with a sheet conveying path interposed therebetween, the pair of conveying rollers conveys a sheet through the sheet conveying path, and one of the pair of conveying rollers is supported by an opening / closing cover. In a sheet conveying device that opens the opening / closing cover to separate the pair of conveying rollers to open the sheet conveying path, one roller shaft of the pair of conveying rollers is engaged when the opening / closing cover is closed. A sheet conveying device, in which the other of the pair of conveying rollers is attached to a positioning member that defines a position relative to the other of the pair of conveying rollers. 2. A roller holding member is slidably provided on the opening / closing cover, a biasing member is attached to the roller holding member, and the bearing is biased by the biasing member, and the roller holding member is pushed through the bearing. The sheet conveying apparatus according to claim 1, wherein one of the pair of conveying rollers is rotatably held. 3. The positioning member is provided with a fitting hole into which the other roller shaft of the pair of conveying rollers is fitted, and an engaging recess into which the one roller shaft is removably engaged. The sheet conveying device according to claim 1.