JP3359218B2 - Re-feeding apparatus and image forming apparatus provided with the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a re-feeding device for re-forming an image on a sheet material after image formation, an electrophotographic apparatus provided with the re-feeding device, an electrostatic recording device, The present invention relates to an image forming apparatus such as a laser beam printer.

[0002]

2. Description of the Related Art Conventionally, there has been known a re-feeding device which is detachably mounted on an image forming apparatus such as a laser beam printer. This is used, for example, when forming an image on both sides of a sheet material. That is, the sheet material on which image formation has been performed once on one surface in the image forming unit of the image forming apparatus is supplied to the image forming unit again without being discharged to the outside of the image forming apparatus main body, and is supplied to the other surface. An image is formed.
The refeeding device performs a so-called switchback operation of reversing the sheet material when the sheet material after image formation is resupplied to the image forming unit.

[0003]

However, according to the above-described re-feeding device, it is necessary to provide a special sheet-material standby unit in order to perform the switch-back operation of the sheet material. However, the size of the image forming apparatus has become large, which has hindered the downsizing of the entire image forming apparatus.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a re-feeding device capable of downsizing, and an image forming apparatus capable of downsizing by providing the re-feeding device. It is.

[0005]

According to a first aspect of the present invention, there is provided a sheet which is removably mounted on an image forming apparatus main body and has been subjected to image formation by an image forming section in the image forming apparatus main body. In the re-feeding device for feeding the material again to the image forming unit, the re-feeding device connects the downstream side and the upstream side of the image forming unit in the conveying direction of the sheet material at the time of attachment to the image forming apparatus main body. A feeding / conveying path, re-feeding means for re-supplying the image-formed sheet material to the image forming unit via the re-feeding / conveying path when the image forming apparatus is mounted on the image forming apparatus main body; and a frame <br/> over arm member parts constituting the road and refeeding means is assembled, together with a portion of the frame member constituting a part of the refeed conveying path, said resupply Sending device
Forming part of the exterior .

In the present invention according to claim 2, the re-feeding conveyance path has a sheet material standby section for reversing the sheet material at the time of re-supply to the image forming section by a switchback operation. The re-feeding means has a switch-back feeding means for performing a switch-back operation on the sheet material.

According to a third aspect of the present invention, a part of the frame member constitutes the sheet material standby section.

According to a fourth aspect of the present invention, at least a portion of the frame member that forms the sheet material standby portion is made of a metal member.

According to a fifth aspect of the present invention, a ventilation hole is formed in a portion of the frame member that constitutes the re-feeding conveyance path.

[0010]

Next, according to a sixth aspect of the present invention, there is provided an image forming apparatus comprising:
In the apparatus, a sheet conveying means for feeding conveying the sheet material to be used for image formation, an image forming unit for forming an image on the sheet material, and re-feeding device according to any one of claims 1 to 5 , Is provided. Claim 7
The present invention is detachably attached to an image forming apparatus main body.
And an image forming unit in the image forming apparatus main body.
The sheet material on which the image formation has been completed is again
In the re-feeding device for supplying to the forming section, the image forming apparatus
When the sheet is mounted on the main body,
To connect the downstream side and the upstream side of the image forming section.
At the time of mounting on the feeding conveyance path and the image forming apparatus main body.
The sheet material after the image formation is passed through the re-feeding conveyance path.
Re-feeding means for re-supplying the image to the image forming section, and
Frame in which re-feeding conveyance path and re-feeding means are incorporated
And a re-feeding conveyance path is provided in the image forming section.
The sheet material at the time of resupply is
Switchback guide member
And a switch in the switchback guide member.
The backed sheet material is moved in the width direction by the position
And a guide member for guiding while regulating the position of
The re-feeding means includes a switchback for the sheet material.
Switchback feeding means to perform
Then, a part of the frame member is provided on the exterior of the refeeding device.
A guide that forms part of the switchback
A guide that constitutes a member and guides while regulating the position.
The switch member with respect to the frame member.
Assembled above the guide member for
It is characterized by the following.

[Operation] Based on the above configuration, the frame member of the re-feeding device also serves as a part of the re-feeding transport path. The exclusive configuration can be simplified.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. <Embodiment 1> FIG. 1 shows a schematic configuration of a refeeding apparatus and an image forming apparatus according to the present invention. FIG. 3 is a vertical cross-sectional view in a direction along a sheet material conveying direction in a state where a refeeding device is mounted on a laser beam printer as an example of an image forming apparatus.

First, the configuration of a portion of the image forming apparatus excluding the re-feeding device will be described.

An image forming apparatus M shown in FIG. 1 has a feeding / conveying means 2 having a plurality of roller members for feeding / conveying a sheet material S such as paper as an image forming object inside an image forming apparatus main body 1; A scanner unit 3 for performing exposure based on information; an image forming unit 4 having a drum-type electrophotographic photosensitive member (hereinafter referred to as a “photosensitive drum”) 4 a for forming a toner image on the photosensitive drum 4 a; A transfer unit 5 for transferring the formed toner image to the sheet material S, a fixing unit 6 for fixing the transferred toner image to the sheet material S, and the like are provided.

The feeding / conveying means 2 includes a sheet feeding cassette 2a for storing the sheet material S, a sheet feeding roller 2b for feeding the sheet material S from the sheet feeding cassette 2a, and a conveying roller pair for conveying the fed sheet material S. 2c, the image forming unit 4 synchronizes the conveyed sheet material S with the toner image on the photosensitive drum 4a.
Roller pair 2d for supplying the sheet material S, a discharge roller pair 2e for discharging the sheet material S after the toner image is fixed, and a face-down discharge path 2f serving as a guide for the sheet material S conveyed to a face-down discharge tray 7 described later. And a pair of discharge rollers 2g arranged at the exit of the face-down discharge path, and a sheet material discharge port 2h serving as a discharge port of the sheet material S conveyed toward the face-up discharge tray 8 described later.

The scanner unit 3 includes an oscillator that emits laser light on / off based on image information, a polygon mirror that rotates at high speed and scans the photosensitive drum 4a with the laser light, and the like.

The image forming section 4 includes a photosensitive drum 4a and a plurality of process devices for forming a toner image on the surface of the photosensitive drum 4a.
For example, charging means for uniformly charging the photosensitive drum 4a, developing means for attaching toner to the electrostatic latent image formed on the photosensitive drum 4a by the above-described scanner unit 3 and developing it as a toner image, and after transferring the toner image The cleaning unit includes a cleaning unit that removes transfer residual toner remaining on the photosensitive drum 4a. The photosensitive drum 4a and at least one of the above-described plurality of process devices are integrally incorporated in a cartridge container to constitute a process cartridge. This process cartridge is detachably mounted to the image forming apparatus main body 1. Of the above-described process equipment, the remaining ones not incorporated in the process cartridge are disposed on the image forming apparatus main body 1 side.

The fixing means 6 includes a heating roller and a pressure roller for fixing the unfixed toner image transferred from the surface of the photosensitive drum 4a to the sheet material S by heating and pressing the sheet.

A face-down discharge tray 7 and a face-up discharge tray 8 are disposed on the upper and left portions of the main body 1 of the image forming apparatus, respectively. The sheet is discharged with the recording surface on which the image is formed facing down (face down), or is ejected with the recording surface facing up (face up). Of these paper discharge trays 7 and 8, the face-up paper discharge tray 8 is provided with a shaft 8 with respect to the image forming apparatus main body 1.
It is configured to be openable and closable about a. In addition, a swingable flapper 9 for switching the conveying direction of the sheet material S between the upper face-down discharge path 2f and the left-side sheet discharge port 2h in conjunction with the opening / closing operation of the face-up discharge tray 8 is provided. Has been established. The flapper 9 is disposed at the solid line position in FIG. 1 when the face-up discharge tray 8 is disposed at the closed position indicated by the solid line in FIG. 1 (at the time of face down). Tray 8
Is arranged at the open position indicated by the broken line in the drawing (at the time of face-up), it is arranged at the broken line position in the drawing. A cam member 9b is fixed to one end of the rotation shaft 9a of the flapper 9. In a configuration in which a toner image is formed on the lower surface of the sheet material S by the image forming unit 4 (the lower surface is a recording surface), the face-down discharge tray 7 and the face-up discharge tray 8
Is reversed.

The image forming apparatus main body 1 is provided with a re-feeding device for feeding the sheet material to the image forming unit 4 again in order to perform recording on the other surface of the sheet material recorded on one surface. The feeding device 10 is detachably attached.

Next, the configuration of the sheet re-feeding device 10 will be described. The re-feeding device 10 automatically switches the flapper 9 when the face-up discharge tray 8 is closed, and transfers the sheet material in the conveying direction of the sheet material (the face-down discharge path 2f).
/ Automatic switching means 1 for selecting the re-feeding device discharge path 2h)
1 is provided.

The automatic switching means 11 is provided with a central pivotable a switching lever 11a to pivot 11a _1, and a solenoid 11b for swinging the switching lever 11a,
The above-mentioned flapper 9 is attached to one end of the above-mentioned switching lever 11a.
Cam follower 11 abutting on cam member 9b fixed to
a ₂ is formed, the plunger of the above solenoid 11b is connected to the other end.

In the vicinity of the sheet material receiving port of the re-feeding device 10, a sheet material S conveyed out of the image forming apparatus main body 1 is provided.
A cover member 12 provided with a guide surface 12a for introducing the liquid into the re-feeding device 10 is provided, and the cover member 12 is swingable about a support shaft 12b. A reversible switchback conveyance roller for performing switchback conveyance for reversing the conveyance direction of the sheet material S introduced from the sheet material reception port in the refeed conveyance path of the refeeding device 10. A pair (refeeding means, switchback feeding means) 13 is provided.

The refeeding device 10 includes an opening / closing body 14 which opens a part of the refeeding conveyance path and has guide surfaces 14a and 14e forming a part of the refeeding conveyance path. The opening / closing body 14 is supported rotatably about a support shaft 14b at one end thereof. The above-mentioned cover member 12 is swingably supported at the other end of the opening / closing body 14, the boss 12 c of the cover member 12 and the elongated hole 14 c of the opening / closing body 14 are engaged, and the elastic member 15 In the same figure, it is urged counterclockwise. In the figure, reference numeral 16 denotes a detection sensor that detects the open / closed state of the face-up discharge tray 8 by detecting the swing position of the cover member 12 described above, and 17 guides the leading end of the sheet material S. Inverted flapper 1
8 is a detection sensor that detects the position 8 (the presence or absence of a sheet material) and detects the open / closed state of the opening / closing body 14.

A large number of re-feeding conveyance paths A, B, C, D are formed in the re-feeding device 10 by guide members and the like. The re-feeding conveyance path A includes the above-described cover member 12, the opening / closing body 14, and the curved guide member 19a. As shown in FIGS. 1 and 2, the re-feeding conveyance path B includes a guide member 20 and a structural member (frame member) 30 of the re-feeding device 10, and temporarily stores the sheet material S to be switchback-conveyed. To store. A plurality of ribs 30a are provided on the sheet member guide surface of the structural member 30. Reference numeral 31 denotes a reinforcing member (stay). The re-feeding conveyance path C includes the above-described curved guide member 19a and a guide member 19b similarly curved inside the guide member 19a. The re-feeding conveyance path D is constituted by a guide member 23 having position regulating means (lateral registration regulating means) 22 for regulating the position in the width direction of the sheet material S conveyed by the above-mentioned switchback conveying roller pair 13. . A re-feeding conveyance path E is formed by guide members 21a and 21b near the sheet material entrance on the image forming apparatus main body 1 side (right side in FIG. 1).

In the drawing, reference numeral 24 denotes a pair of skew feeding rollers (re-feeding means) for pressing one side edge of the sheet material S in the re-feeding conveyance path D against the lateral registration regulating means 22 while conveying the sheet material S. is there. Reference numeral 25 denotes a detection sensor for detecting the presence or absence of the sheet material S in the re-feeding conveyance path D. Reference numeral 26 denotes a driving motor as a driving source for driving the switchback conveyance roller pair 13 and the skew feeding roller pair 24, respectively. Reference numeral 28 denotes a substrate on which a power supply, a control circuit, and the like are arranged. These parts are guide members,
It is assembled to the structural member 30 together with various parts such as stays and covers.

Next, the operation of the above-described re-feeding apparatus 10 and the image forming apparatus M having the same will be described with reference to FIGS.

In the image forming apparatus M, a toner image is formed in the image forming section 4. That is, after the surface of the photosensitive drum 4 a of the image forming unit 4 is uniformly charged by the charging unit, the scanner unit 3 irradiates information light (laser light) based on image information to form an electrostatic latent image. Then, the electrostatic latent image is developed as a toner image by attaching toner by developing means. The toner image thus formed on the surface of the photosensitive drum 4a is transferred to the surface of the sheet S. That is, the sheet material S is fed and conveyed from the sheet feed cassette 2a by the sheet feed roller 2b and the feed roller pair 2c, and is further formed by the registration roller pair 2d so as to be synchronized with the toner image on the photosensitive drum 4a. The toner image on the photosensitive drum 4 a is transferred to the surface of the photosensitive drum 4 a by the transfer unit 5 in the image forming unit 4. The sheet material S after the transfer of the toner image is conveyed to the fixing means 6, where it is heated and pressurized to fix and fuse the toner image.

The sheet material S after fixing the toner image is conveyed by a pair of discharge rollers 2e. At this time, when the face-up discharge tray 8 is at the closed position indicated by the solid line in FIG. 1, the flapper 9 is arranged at the solid line position in FIG.
The sheet material S after the fixing is guided to a face-down carrying-out path 2f extending upward by a flapper 9, and a discharge roller pair 2g.
Is discharged onto the face-down paper discharge tray 7.
This is a so-called face-down discharge.

On the other hand, the face-up discharge tray 8
When the flapper 9 is opened in the direction of the arrow (counterclockwise) in FIG. 1 and disposed at the open position of the broken line, the flapper 9 rotates in the direction of the arrow (counterclockwise) in conjunction with this and is disposed at the position of the broken line in FIG. Is done. Thereby, the unloading direction of the sheet material S after fixing is switched from the face-down unloading path 2f to the sheet material outlet 2h, and the sheet material S fixed by the fixing unit 6 is transferred to the sheet material outlet 2h by the flapper 9. The sheet is guided and further discharged onto the face-up sheet discharge tray 8. This is a so-called face-up discharge.

FIG. 3 is an enlarged view showing a state near the sheet material outlet at the time of face-up discharge. When the face-up sheet discharge tray 8 is opened and arranged at the open position in FIG.
0d cam member 12d provided in a part of the cover member 12
As a result, the cover member 12 swings and rotates clockwise in the drawing around the fulcrum 12b against the urging force of the elastic member 15. Then, the cover member 12
Is a sheet material outlet 2h of the image forming apparatus main body 1.
And the re-feeding conveyance path A is closed, the sheet material S discharged face-up is discharged and stacked on the face-up discharge tray 8. At this time, since the protrusion member 12e provided on the cover member 12 enters the detection sensor 16, the face-up paper discharge tray 8 is opened, and it is recognized that the face-up paper discharge state is established. In a state where the face-up discharge tray 8 is at the open position,
The sheet material S cannot be re-fed using the re-feeding device 10. That is, re-feeding (double-sided mode) can be performed only when the face-up paper discharge tray 8 is located at the closed position (face-down paper discharge state).

Next, referring to FIG. 4, with the face-up paper discharge tray 8 in the closed position, the solenoid 1
When the plunger 11b of 1b is shortened in the direction of the arrow in the figure, the switching lever 11a is rotated in the arrow direction (clockwise direction) about the shaft 11a _1. Then by the cam follower 11a ₂ at one end of the switching lever 11a biases the cam member 9b fixed to the flapper 9, the flapper 9 is rotated in the arrow direction (counterclockwise direction) about the rotary shaft 9a, This is the same state as the above-described face-up discharge. That is, the conveying direction of the sheet material S can be switched by the operation of the solenoid plunger 11b while the face-up sheet discharge tray 8 is not opened at the open position but is arranged at the closed position.

After the fixing, the sheet material S conveyed by the discharge roller pair 2e is switched in the conveying direction by the flapper 9 and re-feeded by the re-feeding device 10 through the sheet material outlet 2h of the image forming apparatus main body 1. It is carried into the transport path A. Then, as shown in FIG. 5, the sheet material S passes through the reversing flapper 18 while being guided by the guide surface 14a of the opening / closing body 14 and the guide member 19a, is nipped and conveyed by the switchback conveyance roller pair 13, and is re-fed. It is carried into the transport path B.

The above-described reversing flapper 18 is swingably supported by a support shaft 18a, and the conveyed sheet material S
A guide 18c for guiding the leading end of the sheet material conveyed in a switchback manner;
and a flag portion 18d provided at one end of "a".
When there is no sheet material S in the re-feeding conveyance path A, a part of the reversing flapper 18 comes into contact with a contact portion 14d provided on the opening / closing body 14 as shown in FIG. Hold. Here, as shown in FIG. 5, when the sheet material S passes through the reversing flapper 18, the reversing flapper 18
Rotating counterclockwise around 8a, the flag portion 18d of the flapper 18 is separated from the detection sensor 17. Thereby, it is detected that the sheet material S exists in the re-feeding conveyance path A.

As shown in FIG. 6, the sheet material S is further conveyed while being guided by the guide member 20 and the structural member 30. Thereafter, when the end portion passes through the reversing flapper 18, the flapper 18 is centered on the support shaft 18a. Then, the flag portion 18d enters the detection sensor 17 again. That is, by detecting the rear end of the sheet material S, the drive motor 26 is rotated in the reverse direction, and a so-called switchback operation is started. Switchback transport roller pair 1
7, the sheet material S is guided by the guide surface 18c of the reversing flapper 18 and carried into the re-feeding conveyance path C as shown in FIG. This re-feeding conveyance path C is curved in the conveyance direction of the sheet material S, and the sheet material S that is switchback-conveyed by the switchback conveyance roller pair 13 is:
It is conveyed along guide members 19a and 19b. The leading end of the sheet material S is carried into the re-feeding conveyance path D, and is carried into the position regulating means (lateral registration regulating means) 22. After the position of the sheet material in the width direction is regulated by the position regulating means 22, the sheet material S moves along the transport path E (see FIG. 1) from the rear end side on the surface opposite to the surface on which recording has already been performed. The sheet passes through the image forming unit 4 again. Thereafter, the above-described image forming operation is similarly performed on the sheet material S, an image is recorded and formed on the back surface, and the sheet material S is discharged and stacked on the face-down discharge tray 7 by the discharge roller pair 2g.

According to the refeeding apparatus 10 having the above-described structure, the structural member 30 also serves as a guide member for switching back the sheet material, so that there is no need to provide any other guide member, and the overall structure of the apparatus can be reduced in size. Can be

In this embodiment, the re-feeding conveyance path B is a conveyance path where the sheet material S is temporarily stopped for switch-back conveyance. Since the transport path B is formed by the structural member 30 as described above, the time for which the sheet material S contacts the structural member 30 is prolonged, so that the residual heat of the sheet material S heated during fixing can be efficiently removed. . By the cooling operation of the sheet material S, there is an effect of preventing the temperature inside the image forming apparatus main body 1 as well as the main body of the re-feeding apparatus 10 from being raised.

In this embodiment, the sheet material S
Is transported while always abutting on a guide surface formed at a portion where the structural member 30 is exposed to the outside. As a result, the sheet material S can be cooled more efficiently. <Embodiment 2> If the structural member 30 of the re-feeding device 10 is made of a metal material having a higher thermal conductivity than a resin material, the heat taken from the sheet material S heated by fixing is obtained. Is easily transmitted to the entire structural member 30. That is, the structural member 30 functions as a heat sink, and the sheet material S
And the cooling effect of the re-feeding device 10 is increased. In addition, the sheet material S that has been charged after being printed on one side (image formation) can be neutralized. Therefore, the image quality of the second surface formed thereafter is improved, and the generation of electric noise can be prevented. Further, by using a sheet metal, it is possible to further reduce the size and thickness. <Third Embodiment> Further, as shown in FIG. 8, if a large number of ventilation holes 30b are provided in the portion of the structural member 30 of the refeeding device 10 facing the sheet material S, the structural member 3
The cooling effect of 0 and the sheet material S is further improved by the convection action. In particular, the refeeding conveyance path B is arranged horizontally, and the structural member 3
If the 0 through-hole 30b is exposed outside the image forming apparatus main body 1, the cooling effect is further increased.

[0040]

As described above, according to the present invention,
Since a part of the frame member of the re-feeding device constitutes a part of the re-feeding conveyance path, the configuration of the re-feeding device can be simplified and downsized accordingly.

Further, the image forming apparatus provided with the re-feeding device simplified by this configuration can simplify and reduce the size of the entire image forming apparatus.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a schematic configuration of a refeeding device according to the present invention and an image forming apparatus including the same.

FIG. 2 is a view taken along line XX of FIG. 1;

FIG. 3 is an enlarged vertical cross-sectional view of a main part showing an operation of discharging a sheet material on which an image is formed on one side to a face-up discharge tray.

FIG. 4 is an enlarged longitudinal sectional view of a main part showing an operation of carrying a sheet material having an image formed on one side into a re-feeding device.

FIG. 5 is an enlarged vertical cross-sectional view of a main part showing an operation for switchback conveying a sheet material on which an image is formed on one side by a re-feeding device.

FIG. 6 is an enlarged vertical cross-sectional view of a main part showing an operation for switch-back conveying a sheet material on which an image is formed on one side by a re-feeding device.

FIG. 7 is an enlarged vertical cross-sectional view of a main part showing an operation for switchback-conveying a sheet material having an image formed on one side by a re-feeding device.

FIG. 8 in Embodiment 3 (Embodiment 1)
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Image forming apparatus main body 2 Feeding / conveying means 2f Face-down carrying-out path 2h Sheet material carrying-out port 3 Scanner unit 4 Image forming unit 4a Electrophotographic photosensitive member 5 Transfer means (transfer roller) 6 Fixing means 7 Face-down paper discharge tray 8 Face-up Paper discharge tray 9 flapper 10 re-feeding device 11 automatic switching means 11a switching lever 12 cover member 13 re-feeding means (switch feeding means, switchback transport roller pair) 14 opening / closing body 15 elastic member 16, 17, 25 detection sensor Reference Signs List 18 reverse flapper 19a, 19b, 20, 21a, 21b, 23 guide member 24 re-feeding means (oblique feed roller pair) 30 frame member (structural member) 30b through-hole A, C, D re-feeding conveyance path B re-feeding Feeding / conveying path (sheet material standby unit) M Image forming apparatus S Sheet material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 85/00 B65H 5/38 B65H 29/58

Claims (7)

(57) [Claims] An image forming apparatus which is detachably mounted on an image forming apparatus main body;
Image forming in the main body of the image forming apparatus
The sheet material on which image formation has been completed by the
A refeeding device for supplying the image forming unit with the sheet material when the sheet material is mounted on the image forming apparatus main body;
Downstream and upstream of the image forming section with respect to the transport direction of
And a re-feeding conveyance path connecting the image forming apparatus and the image forming apparatus.
Forming the image of the sheet material via the re-feeding conveyance path
Re-feeding means for re-supplying the parts, and these re-feeding conveyance pathsAndRefeeding meansThe components that make up
AttachedA frame member, and a part of the frame member forms a part of the re-feeding conveyance path.
MakeTogether form a part of the exterior of the refeeding device.
,  A refeeding device characterized by the above-mentioned. 2. The image forming apparatus according to claim 1, wherein the re-feeding conveyance path has a sheet material standby unit for turning over the sheet material when re-supplying the image forming unit by a switchback operation. The refeeding device according to claim 1, further comprising switchback feeding means for performing a switchback operation on the sheet material. 3. The re-feeding device according to claim 2, wherein a part of the frame member constitutes the sheet material standby unit. 4. The re-feeding device according to claim 3, wherein at least a portion of the frame member that forms the sheet material standby unit is formed of a metal member. 5. A ventilation hole is formed in a portion of the frame member which constitutes the re-feeding conveyance path.
Item. A sheet conveying means 6. A sheet conveying a sheet material to be used for image formation, an image forming unit for forming an image on the sheet material, refeeding according to any one of claims 1 to 5 And an image forming apparatus. 7. Removably mountable to the image forming apparatus body
Image forming in the main body of the image forming apparatus
The sheet material on which image formation has been completed by the
In the re-feeding device for supplying to the image forming unit, When the sheet material is attached to the image forming apparatus main body, the sheet material is
Downstream and upstream of the image forming section with respect to the transport direction of
And a re-feeding conveyance path connecting When the image forming apparatus is mounted on the image forming apparatus main body, the image forming apparatus
Forming the image of the sheet material via the re-feeding conveyance path
Re-feeding means for re-supplying the part; A frame in which the re-feeding conveyance path and the re-feeding means are incorporated.
Arm member The re-feeding conveyance path is used when re-supplying the image forming section.
Sheet material is turned upside down by switchback operation.
And a switchback guide member for
Switched back in the guide member for
The position of the sheet is regulated in the width direction by the position regulating means.
And a guide member for guiding while The re-feeding means includes a switchback for the sheet material.
Switchback feeding means to perform
And Part of the frame member is part of the exterior of the refeeding device.
And a guide member for the switchback.
Constitute A guide member for guiding while performing the position regulation,
A guide portion for the switchback with respect to a frame member
Assembled above the timber, A refeeding device characterized by the above-mentioned.