JP2021130541A - Sheet conveying device, image formation device - Google Patents

Abstract

To improve operability of a sheet conveying device and an image formation device provided with this.SOLUTION: A sheet conveying device (600) and an image formation device provided with this has a first guide means (610) which has a conveying means (622a, 622b), a pair of guides (611a, 611b), of which at least one is a first movable guide (611b) rotatable with respect to the first axis (613) and can open a first conveying path (610A) by rotating the first movable guide and a second guide means (620) of which at least one has a pair of guides (621a, 621b) that are second movable guides (621b) rotatable with respect to the second axis (623)and can open a second conveying path (620A) by rotating the second movable guide. The second movable guide has a contact part (624) arranged on the rotation trajectory (OB) of the first movable guide and rotates while the first movable guide rotates in a state of being in touch with the contact part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sheet transporting device for transporting sheets and an image forming apparatus including the same.

In a paper transport device for transporting paper in an image forming apparatus such as a printer, a horizontal transport path for guiding the paper substantially horizontally and a vertical transport path for guiding the paper substantially vertically are arranged close to each other to reduce the size of the device. There is one that realized. Further, each of the horizontal transport path and the vertical transport path is provided with a guide member for guiding the paper so that the opening direction of the guide member of the vertical transport path is different from the opening direction of the guide member of the horizontal transport path. Is located in. By providing a lock mechanism for locking the guide member, it is possible to stabilize the nip pressure of the roller pair that conveys the paper. In this case, in order to remove the jammed paper, it is necessary to move the guide member of the horizontal transport path and the guide member of the vertical transport path after unlocking the lock mechanism.

On the other hand, Patent Document 1 discloses a configuration including a guide member that can be unlocked by interlocking a plurality of locking mechanisms. In the configuration of Patent Document 1, while a plurality of lock mechanisms can be interlocked and unlocked to open the transport path, a plurality of lock mechanisms cannot be interlocked and locked. Therefore, when removing the jammed paper, it is necessary to confirm whether or not all the guide members are locked, and there is a problem that the operability is not good.

Japanese Unexamined Patent Publication No. 2011-11838

The present invention has been made to solve the above problems, and an object of the present invention is to improve operability in a sheet transfer device and an image forming device including the same.

In order to solve the above problems, one aspect of the present invention is a first aspect of a sheet transporting device and an image forming apparatus including the same, in which a transporting means for transporting sheets and at least one of them is rotatable with respect to a first axis. A first guide means which has a pair of guides which are movable guides and can open a first transport path in which a sheet is transported by the transport means by rotating the first movable guide, and at least one of the guide means. It has a pair of guides that are second movable guides that can rotate with respect to a second axis in a direction different from that of the first axis, and by rotating the second movable guide, it is adjacent to the first transport path. The second movable guide includes a second guide means capable of opening the second transport path, and the second movable guide has a contact portion arranged on the rotation locus of the first movable guide, and the first movable guide has a contact portion. Is characterized in that it rotates as it rotates in a state of being in contact with the contact portion.

According to the present invention, operability can be improved in a sheet transfer device and an image forming device including the sheet transfer device.

FIG. 6 is a schematic configuration diagram of an image forming apparatus including the sheet transporting apparatus of the first embodiment. Sectional drawing (a, b) of the sheet transfer apparatus of Example 1. FIG. The upper perspective view (a, b) of the sheet transfer apparatus of Example 1. FIG. FIG. 3 is a schematic cross-sectional view of the sheet transport device of the second embodiment.

Hereinafter, examples of the present disclosure will be described with reference to the drawings. In the following description, an electrophotographic full-color printer having a plurality of photosensitive drums is taken as an example of the image forming apparatus, but in addition to this, a monochrome printer and an image forming means having an image forming means such as an inkjet method are formed. It may be configured to include an apparatus.

<Overall configuration of image forming device>
First, the configuration of the image forming apparatus 100 including the conveying path portion 600 as the sheet conveying device of the first embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of the image forming apparatus 100 of this embodiment. FIG. 1 shows a schematic configuration of an image forming apparatus 100 in a state where the front door of the apparatus main body 400 of the image forming apparatus 100 is opened. By opening the front door of the apparatus main body 400, the user of the image forming apparatus 100 can access the internal configuration of the apparatus main body 400.

An image forming unit 410 as an image forming means of this embodiment is provided inside the apparatus main body 400 of the image forming apparatus 100. The image forming unit 410 has image forming units Pa, Pb, Pc, and Pd that form an image based on an image signal. As a flow of image formation, the control unit 309 first converts an image signal into a PWM (pulse width modulation controlled) laser beam. The polygon scanner 310 as the exposure apparatus of this embodiment scans a laser beam according to an image signal. Then, the laser beam is irradiated to the photosensitive drums 20a, 20b, 20c, and 20d as the image carriers in the image forming portions Pa, Pb, Pc, and Pd. The image forming unit Pa is an image forming means for generating a yellow (Y) toner image, and the image forming unit Pb is an image forming means for generating a magenta (M) toner image. Further, the image forming unit Pc is an image forming means for generating a toner image of cyan (C), and the image forming unit Pd is an image forming means for generating a toner image of black (Bk). Since the configurations of the image forming units Pa, Pb, Pc, and Pd are standardized, the flow of image formation in the image forming unit Pa will be described below as an example, and the image forming units Pb, Pc, and Pd will be described. Is omitted.

In the image forming unit Pa, first, the surface of the photosensitive drum 20a is charged to a predetermined potential by the primary charging device 21a. Next, a laser beam is irradiated from the polygon scanner 310 to the photosensitive drum 20a charged to a predetermined potential, and an electrostatic latent image is formed on the surface of the photosensitive drum 20a. The electrostatic latent image on the photosensitive drum 20a is developed in the developing device 22a, and a yellow toner image is formed on the surface of the photosensitive drum 20a. Reference numeral 23dia is a transfer roller. A transfer roller 23a is arranged on the back surface of the intermediate transfer belt 204. By applying a primary transfer bias having a polarity opposite to that of the toner by the transfer roller 23a, the toner image on the photosensitive drum 20a is intermediate. It is transferred to the transfer belt 204. The toner remaining on the photosensitive drum 20a without being transferred is removed by the cleaner 27a. The toner image transferred to the intermediate transfer belt 204 is sequentially conveyed to the image forming portions Pb, Pc, and Pd, and the toners of the respective colors formed on the image forming portions Pb, Pc, and Pd in the order of Y, M, C, and Bk. The image is transferred. As a result, a four-color image is formed on the intermediate transfer belt 204. A secondary transfer electric field having a polarity opposite to that of the toner is applied to the toner image on the intermediate transfer belt 204 in the secondary transfer unit 25 composed of the secondary transfer roller pairs 205 and 206. As a result, the toner image is secondarily transferred to the sheet P. The sheet P fed from the feeding unit 420 is conveyed from the registration unit 208 toward the secondary transfer unit 25 at the timing when the toner image on the intermediate transfer belt 204 is aligned with the toner image.

After that, the toner image of the sheet P is heated and pressurized by the fixing device 500 as an image heating device and fixed to the sheet P. The sheet P on which the toner image is fixed is discharged to the discharge tray 601 via the transport path unit 600, or the reverse induction path portion 700 for reverse discharge of the sheet P and formation of a double-sided image on the sheet P. It is transported toward one of the above. In this embodiment, the first guide unit 610 and the second guide unit 620 (FIGS. 2 (a,)) are arranged inside the apparatus main body 400 of the image forming apparatus 100 having such a configuration so that they can be opened and closed in different directions. b) and) are provided. The transport path portion 600 is located inside the apparatus main body 400 and downstream of the fixing device 500 in the transport direction of the sheet P. The transport path portion 600 is provided with a first guide portion 610 as a first guide means of this embodiment and a second guide portion 620 as a second guide means. Inside the apparatus main body 400, a clearance is provided around the first guide portion 610 and the second guide portion 620 so as not to come into contact with the fixing device 500 or the image forming unit 410. The first guide portion 610 and the second guide portion 620 are configured to be rotatable within this clearance range. The detailed configuration of the first guide unit 610 and the second guide unit 620 will be described later.

The image forming apparatus 100 may be configured to include an image reading apparatus 300 arranged above the apparatus main body 400. The image reading device 300 reads a document such as a sheet placed on the platen glass 302 by the optical unit 300A. In the optical unit 300A, the light emitted from the light source 303 is reflected on the sheet, and the reflected light of the sheet is imaged on the CCD sensor 305 via the optical system member 304 such as a lens. The optical unit 300A converts the image of the sheet scanned and read in the direction of the arrow SC in FIG. 1 into image signal data for each line. The image signal obtained by the CCD sensor 305 is transmitted to the apparatus main body 400, and the control unit 309 performs image processing corresponding to the image forming units Pa, Pb, Pc, and Pd. Further, the control unit 309 can use the information received from the print server or the like connected to the image forming apparatus 100 as the image signal.

<Structure of sheet transfer device>
Next, the configuration of the first guide unit 610 and the second guide unit 620 and the mode of jam processing when jam occurs in the transport path unit 600 will be described. FIG. 2A is a cross-sectional view of the transport path portion 600 in a state where the first transport path 610A and the second transport path 620A to which the sheets are transported are formed, and FIG. 2B is a cross-sectional view of the first transport path 610A. It is a cross-sectional view of the transport path portion 600 in a state where the second transport path 620A is open. Further, FIG. 3A is a perspective view of the transport path portion 600 in a state where the first transport path 610A and the second transport path 620A through which the sheets are transported are formed, and FIG. 3B is the first transport. It is a perspective view of the transport path portion 600 in a state where the road 610A and the second transport path 620A are open. In addition, in FIG. 2 (a, b) and FIG. It is shown by a broken line as 610A and the second transport path 620A. That is, if the first transport path 610A and the second transport path 620A are transport paths in which the sheet is transported in the first guide section 610 and the second guide section 620, FIGS. 2 (a, b) and 3 (a). , B) may be other than the position and shape shown by the broken line.

As described above, the transport path portion 600 is composed of a first guide portion 610 and a second guide portion 620 adjacent to the first guide portion 610. In the sheet transport direction CA, the first guide portion 610 is arranged at a position upstream of the second guide portion 620. The first guide portion 610 includes a transport roller 612a that conveys the sheet, and a driven roller 612b that is attached to the upper guide 611b and forms the transport roller 612a and the nip portion. The driven roller 612b is installed on the upper guide 611b in a state of being urged toward the transport roller 612a at a constant pressure by an urging member (not shown). The first transport path 610A to which the sheet is conveyed in the first guide portion 610 is formed by a pair of guides, the upper guide 611b and the lower guide 611a. In this embodiment, at least one of the upper guide 611b and the lower guide 611a is a first movable guide that is rotatable with respect to the shaft 613. 2 (a, b) and 3 (a, b) show a configuration in which the upper guide 611b is rotatable with respect to the shaft 613 as the first shaft of the present embodiment. The first movable guide of the embodiment is the upper guide 611b. The arrow UP in FIG. 2A indicates the rotation direction of the upper guide 611b. The shaft 613 is arranged on the back side of the device main body 400 when the device main body 400 (see FIG. 1) is viewed from the front to the back. Further, the shaft 613 is arranged in a direction parallel to the sheet transport direction CA. When removing the sheet remaining in the first guide portion 610, the upper guide 611b is operated by operating the grip portion 615 provided on the front side of the apparatus main body 400 and on the front side of the first guide portion 610. Rotates in the direction of the arrow UP. When the upper guide 611b rotates, the distance between the lower guide 611a and the upper guide 611b becomes large, and as a result, the user accesses the first transport path 610A from the front side of FIG. 2B. It will be in a possible open state. As described above, the first guide portion 610 of the present embodiment has an upper guide 611b and a lower guide 611a, which are a pair of guides whose at least one is rotatable with respect to the shaft 613. Then, the first guide portion 610 can open the first transport path 610A by rotating the upper guide 611b with respect to the shaft 613.

The second guide portion 620 includes a transport roller 622a that conveys the sheet, a transfer roller 622a, and a driven roller 622b that forms a nip portion. The transport means of this embodiment is composed of a transport roller 612a, a driven roller 612b, a transport roller 622a, and a driven roller 622b. Further, the transfer roller pair of this embodiment is composed of a transfer roller 622a and a driven roller 622b. The driven roller 622b is installed on the upper guide 621b in a state of being urged toward the transport roller 622a at a constant pressure by an urging member (not shown). The second transport path 620A to which the sheet is conveyed in the second guide portion 620 is formed by a pair of guides, the upper guide 621b and the lower guide 621a. In this embodiment, at least one of the upper guide 621b and the lower guide 621a is a second movable guide that is rotatable with respect to the shaft 623. FIG. 2A and 2B show a configuration in which the upper guide 621b is rotatable with respect to the shaft 623 as the second axis of the present embodiment. In this case, the second movable guide of the present embodiment is The upper guide 621b. The arrow OP in FIG. 2A indicates the rotation direction of the upper guide 621b. As shown in FIG. 2B, the upper guide 621b is rotated so that the upstream end of the transport direction CA of the second guide portion 620 is opened wider than the downstream end, and the transport direction. The user can access the second transport path 620A from the upstream end of the CA. Further, the second guide portion 620 is provided downstream of the first guide portion 610 in the sheet transport direction CA. Further, the axis 623 as the second axis of this embodiment is in the direction orthogonal to the axis 613, and the end portion of the second guide portion 620 opposite to the end portion on the side adjacent to the first guide portion 610. It is provided in. That is, the shaft 623 is arranged along the direction orthogonal to the sheet transport direction CA, in other words, the width direction of the sheet.

Further, the second guide portion 620 has an urging member 625 and an abutting member 621c between the lower guide 621a and the upper guide 621b. When the device main body 400 (see FIG. 1) is viewed from the front to the back, the urging members 625 are installed on the front side and the back side of the device main body 400, respectively. 2 (a, b) and 3 (a, b) show the urging member 625 arranged on the front side of the apparatus main body 400. Further, the abutting member 621c is provided on either one of the upper guide 621b and the lower guide 621a. FIG. 2A and 2B show a configuration in which the abutting member 621c is provided on the upper guide 621b. The urging member 625 as the urging means of this embodiment is an elastic body such as a spring, and the second guide portion 620 is attached in the direction in which the second transport path 620A is formed by the upper guide 621b and the lower guide 621a. It is gaining momentum. As a result, the upper guide 621b can be rotated to a position where the upper guide 621b and the lower guide 621a form the second transport path 620A and a position where the user can access the second transport path 620A in an open state. Is. The position of the upper guide 621b when the second transport path 620A is formed by the upper guide 621b and the lower guide 621a is the first position of this embodiment, and the upper guide 621b when the second transport path 620A is opened. Is the second position of this embodiment. In this embodiment, the upper guide 621b is urged toward the lower guide 621a until the abutting member 621c abuts on the lower guide 621a by the urging member 625 to form the second transport path 620A. That is, the upper guide 621b is urged toward the first position by the urging member 625. Further, when the abutting member 621c abuts on the lower guide 621a, a constant pressure acts on the nip portion between the transport roller 622a and the driven roller 622b.

In addition, either one of the upper guide 621b and the lower guide 621a may be rotatable, and either one may be fixed. 2 (a, b) and 3 (a, b) show a configuration in which the upper guide 621b is rotated and the lower guide 621a is fixed. Further, the upper guide 621b is provided with a contact member 624 as a contact portion of this embodiment. The contact member 624 is arranged on the rotation locus OB when the first guide portion 610 rotates in the upper guide 621b (see FIGS. 2 (a and 2)). Further, the contact member 624 is arranged at a position closer to the axis 613 of the first guide portion 610 than the center of the upper guide 621b in the width direction (see FIGS. 3A and 3B).

With such a configuration, when the user operates the upper guide 611b in the direction of the arrow UP, the upper guide 611b rotates in contact with the contact member 624, and the upper guide portion 620 is above the second guide portion 620. The guide 621b rotates. As a result, in the first guide portion 610, the first transport path 610A is opened by opening from the front side centering on the shaft 613. Then, in the process of opening the first transport path 610A, the contact member 624 provided on the second guide portion 620 comes into contact with the upper guide 611b of the first guide portion 610. At this time, it is assumed that the upper guide 611b is operated so as to open in the direction of the arrow UP from the position where the contact member 624 and the upper guide 611b are in contact with each other. Then, the contact between the contact member 624 and the upper guide 611b causes the upper guide 621b to rotate in the direction of the arrow OP in conjunction with the first guide portion 610. As a result, the nip between the transport roller 622a and the driven roller 622b of the second guide portion 620 is released, and the user can access the second transport path 620A. That is, the second transport path 620A is opened in the second guide portion 620. As a result, the nip between the transport roller 622a and the driven roller 622b is released in conjunction with the opening of the first transport path 610A in the first guide portion 610, and the second transport in the second guide portion 620. Road 620A is in an open state. As described above, in the present embodiment, even when a jam that straddles the first transport path 610A and the second transport path 620A occurs, the operability is improved when the first transport path 610A and the second transport path 620A are opened. Therefore, the operational burden on the user can be reduced.

Further, after removing the jammed sheet, when the first guide portion 610 is closed from the back side centering on the shaft 613 in the direction opposite to the arrow UP in FIG. 2 (a), the contact member 624 and the upper guide 611b The contact with is released. In this embodiment, the upper guide 621b and the lower guide 621a are urged in the direction in which the second transport path 620A is formed. As a result, when the contact state between the contact member 624 and the upper guide 611b is released, the second guide portion 620 is referred to as the arrow OP in FIG. It will be closed in the opposite direction. As a result, the second guide portion 620 is closed and the second transport path 620A is formed in conjunction with the closing of the first guide portion 610 and the formation of the first transport path 610A. That is, in this embodiment, the second transport path 620A is formed in the second guide portion 620 in conjunction with the rotation of the upper guide 611b so that the first transport path 610A is formed. As described above, in the transport path portion 600 of the present embodiment, the first guide portion 610 and the second guide portion 620 can be interlocked and opened / closed simply by operating the upper guide 611b.

The urging member 625 may be arranged at a position where the distance from the shaft 623 to the shaft 623 as the rotation center of the upper guide 621b is larger than the distance from the shaft 623 to the transport roller 622a (FIGS. 2A and 2b). And FIG. 3 (a, b)). As a result, the nip pressure of the nip portion between the transport roller 622a and the driven roller 622b can be made larger than the urging force of the urging member 625. Further, the contact member 624 may be arranged closer to the shaft 613 than the center of the upper guide 611b when viewed in the width direction W of FIGS. 3A and 3B. As a result, since the principle of leverage can be used, the first guide section 610 and the second guide section 620 are interlocked with each other and the first transport path 610A and the second transport path 620A are opened by applying a small force. It becomes possible to do.

Specifically, for example, the first guide portion 610 forms the first transport path 610A with a force of 2.0 kg, and the second guide portion 620 forms the second transport path 620A with a force of 1.0 kg. And. In this case, assuming that the first guide section 610 and the second guide section 620 are simply interlocked to open the first transport path 610A and the second transport path 620A, the user applies a force of 3.0 kg to the upper part. It is necessary to operate the guide 611b. That is, in this case, the force applied by the user is 150% of that when only the first transport path 610A is opened.

On the other hand, a case where the distance of the urging member 625 with respect to the shaft 623 is larger than the distance of the transport roller 622a with respect to the shaft 623 will be considered. If the ratio of the distance of the urging member 625 to the shaft 623 and the distance of the transport roller 622a to the shaft 623 is 1: 2, the urging force of the urging member 625 is 0.5 kg. Further, the position of the contact member 624 with respect to the shaft 623 is farther than the position of the urging member 625 with respect to the shaft 623. Here, assuming that the ratio of the distance of the contact member 624 to the shaft 623 and the distance of the urging member 625 to the shaft 623 is 1: 2, the second guide portion 620 is opened in conjunction with the operation of the upper guide 611b. The force required for this is 2.25 kg. That is, in this case, the force applied by the user is only 112.5% when only the first transport path 610A is opened.

Further, the position of the contact member 624 with respect to the shaft 613 in the width direction W is arranged closer to the shaft 613 than the position of the grip portion 615 with respect to the shaft 613 of the first guide portion 610. It is assumed that the ratio of the distance of the contact member 624 to the shaft 613 in the width direction W and the distance of the grip portion 615 to the shaft 613 is 1: 4. In this case, the force required to open the second guide portion 620 in conjunction with the operation of the upper guide 611b is 2.0625 kg. That is, in this case, the user can open the first transport path 610A and the second transport path 620A in conjunction with each other by applying a force about 3% larger than when only the first transport path 610A is opened. It is possible.

As described above, in the present embodiment, when the first transport path 610A and the second transport path 620A provided in the sheet transport path in the transport path unit 600 are opened, the operation of the first guide unit 610 is performed. The second guide portion 620 can be rotated in conjunction with the above. As a result, it is not necessary to operate the first guide section 610 and the second guide section 620 independently, and the force required for the operation is small. Therefore, the operability is improved and the first transport path 610A and the second transport path 610A and the second transport are performed. It is possible to open the road 620A. Further, the transport path portion 600 can stabilize the nip pressure on the sheet transported through the first transport path 610A and the second transport path 620A without providing a lock mechanism or the like. As a result, it is possible to reduce the man-hours required for the user to open and close the first transport path 610A and the second transport path 620A.

<Structure of sheet transfer device>
In this embodiment, as the transport means for transporting the sheet, the first belt 616b that rotates in contact with the upper surface of the sheet in the first transport path 610A and the first belt 616b that rotates in contact with the lower surface of the sheet in the first transport path 610A. A configuration further including the two belts 616a will be described. In the description of this embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 4, the sheet transporting means of this embodiment has a belt transport unit 616 composed of a first belt 616b and a second belt 616a. A clearance is provided around the first guide portion 610, the second guide portion 620, and the belt transport unit 616 inside the apparatus main body 400 so as not to come into contact with the fixing device 500 or the image forming unit 410. The first guide portion 610, the second guide portion 620, and the belt transport unit 616 are configured to be rotatable within this clearance range. The belt transport unit 616 is arranged on the heat sink 617 as a cooling device. The first belt 616b abuts on the upper surface of the sheet to be transported along the first transport path 610A and rotates. The second belt 616a rotates in contact with the lower surface of the sheet transported along the first transport path 610A. The first belt 616b and the second belt 616a rotate in a state where the sheet is brought into contact with the heat sink 617 by the pressure roller 618, so that the sheet can be conveyed in the conveying direction CA while being cooled. Further, in the present embodiment, in the sheet transport direction CA, the upper guide 611b and the lower guide 611a are arranged on the downstream side of the heat sink 617 to form the first guide portion 610. The first guide portion 610 of this embodiment also has a shaft as in the first embodiment, and when viewed from the front to the back of the device main body 400 (see FIG. 1), the upper guide is on the front side of the device main body 400. The distance between the 611b and the lower guide 611a becomes large, and the first transport path 610A is opened. Further, in the present embodiment, the first belt 616b can rotate about the shaft 613 together with the upper guide 611b as the first movable guide of the present embodiment. Instead of making the first belt 616b rotatable around the shaft 613 together with the upper guide 611b, the second belt 616a rotates around the shaft 613 together with the lower guide 611a as the first movable guide of this embodiment. It may be a movable configuration. That is, either one of the first belt 616b and the second belt 616a can rotate about the shaft 613 together with the first movable guide of this embodiment.

In this embodiment as well, similarly to the first embodiment, the contact member 624 is provided on the rotation locus OB of the upper guide 611b in the upper guide 621b of the second guide portion 620. With such a configuration, in the second guide section 620 of this embodiment as well as in the first embodiment, the second transport path 620A is opened in conjunction with the first guide section 610. That is, the upper guide 621b rotates in conjunction with the rotation of the first belt 616b and the upper guide 611b together, and the second transport path 620A is opened. The first guide section 610 and the second guide section 620 are rotated so that the first transport path 610A and the second transport path 620A are formed from the state where the first transport path 610A and the second transport path 620A are opened. The operation of causing is the same as that of the first embodiment. In this embodiment, with such a configuration, the nip between the transport roller 622a and the driven roller 622b is released in conjunction with the opening of the first transport path 610A, and the second transport path 620A is opened. Can be done. Further, the second transport path 620A is formed in the second guide portion 620 in conjunction with rotating the upper guide 611b or the first belt 616b so that the first transport path 610A is formed. That is, even in the transport path portion 600 of this embodiment, the second guide portion 620 can be opened and closed simply by operating the upper guide 611b or the first belt 616b, and the operability can be improved.

<Other Examples>
When a clearance for rotating the plurality of guide members is provided between the periphery of the plurality of guide members and other parts inside the device main body 400 in the other plurality of guide members inside the device main body 400. Similarly, the configurations of Examples 1 and 2 can be applied to the above.

100: Image forming apparatus / 410: Image forming unit (image forming means) / 600: Transfer path portion (sheet transport device) / 610: First guide portion (first guide means) / 610A: First transport path / 611b: Upper guide (first movable guide, pair of guides) / 611a: Lower guide (pair of guides) / 612a: Conveying roller, 612b: Driven roller (conveying means) / 613: Shaft (first shaft) / 616: Belt transport Unit / 616b: 1st belt / 616a: 2nd belt / 620: 2nd guide unit (2nd guide means) / 620A: 2nd transport path / 621b: Upper guide (2nd movable guide, pair of guides) / 621a : Lower guide (pair of guides) / 621c: Abutting member / 622a: Conveying roller, 622b: Driven roller (conveying means, conveying roller pair) / 623: Shaft (second shaft) / 624: Contact member (contact) Part) / 625: Biasing member (urging means) / CA: Transport direction / W: Width direction

Claims (9)

The means of transporting the sheet and
A first transport in which at least one has a pair of guides that are first movable guides that can rotate with respect to the first axis, and the sheet is transported by the transport means by rotating the first movable guide. The first guide means that can open the road,
At least one of them has a pair of guides which are second movable guides that can rotate with respect to a second axis in a direction different from the first axis, and by rotating the second movable guide, the first transport A second guide means capable of opening a second transport path adjacent to the road is provided.
The second movable guide has a contact portion arranged on the rotation locus of the first movable guide, and as the first movable guide rotates in contact with the contact portion. Rotate,
A sheet transfer device characterized by this. The transport means has a first belt that abuts on the upper surface of the sheet and rotates in the first transport path, and a second belt that abuts and rotates on the lower surface of the sheet in the first transport path.
Either one of the first belt and the second belt can rotate around the first axis together with the first movable guide.
The sheet transport device according to claim 1. The second movable guide can be rotated to a first position for forming the second transport path and a second position for opening the second transport path.
The second guide means has an urging means for urging the second movable guide toward the first position.
The sheet transport device according to claim 1 or 2, wherein the sheet transport device is characterized by the above. The first axis is arranged parallel to the sheet conveying direction.
The second axis is arranged in the width direction of the sheet orthogonal to the transport direction.
The sheet transport device according to claim 3, wherein the sheet transport device is characterized by this. The transport means has a transport roller pair that transports the sheet in the second transport path.
The distance from the second axis to the urging means in the transport direction is larger than the distance from the second axis to the transport roller pair in the transport direction.
The sheet transport device according to claim 4, wherein the sheet transport device is characterized by this. The first guide means is arranged upstream of the second guide means in the transport direction.
The sheet transport device according to claim 4 or 5. The contact portion is arranged closer to the first axis than the center of the second movable guide in the width direction.
The sheet transport device according to any one of claims 4 to 6, wherein the sheet transport device is characterized by this. One of the pair of guides of the second guide means has an abutting member that forms the second transport path by abutting the other of the pair of guides of the second guide means.
The sheet transport device according to any one of claims 1 to 7, wherein the sheet transport device is characterized by this. An image forming means for forming an image on a sheet and
The sheet transport device according to any one of claims 1 to 8, which transports a sheet on which an image is formed by the image forming means.
An image forming apparatus comprising.

Images