JP2002120955A - Sheet carrying device and image forming device attached with the sheet carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect a rear end position of a sheet material by a sensor even if a rotational position of a carrying passage switching member is switched when the sheet material passes. SOLUTION: The sensor 43 is integrally installed on an upper surface of the carrying passage switching member 34 via a support plate 46 so that the sensor 43 integrally rotates with the carrying passage switching member 34. Thus, even if a switching position of the carrying passage switching member 34 is switched to a switching position rotated in the arrow B direction from a position indicated in Fig. 1 in the middle when the sheet material P passes through the carrying passage switching member 34, a distance between the passing sheet material 1 and the sensor 43 can be kept almost constant. Thus, the rear end position of the sheet material P can be accurately detected by the sensor 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a transport direction switching mechanism for switching the transport direction of a sheet material transported on a transport path by a transport path switching member, and a sensor for detecting the sheet material transported on the transport path. The present invention also relates to a sheet conveying apparatus capable of switching a switching position of the conveying path switching member while a sheet material is passing through the conveying path switching member, and an image forming apparatus including the same.

[0002]

2. Description of the Related Art An image forming apparatus such as a copying machine or a printer includes a transport direction switching mechanism for switching the transport direction of a sheet material transported on a transport path after an image is formed by a branch claw serving as a transport path switching member. Most of the sheet conveying apparatuses are provided with a sensor for detecting a sheet material conveyed along the conveying path.

In such a conventional sheet conveying apparatus, when a sheet material on which an image is formed is conveyed to the sheet conveying apparatus, the sheet is fixed by a sensor fixed to a fixing member such as a guide plate in a conveying path. Detects the leading edge of the material and controls the timing to rotate the transport roller provided downstream from the signal based on the signal, controls the switching timing of the branch claw, and reverse rotation in the case of the reversing part For example, the reversing timing of the reversing transport roller is controlled.

[0004]

However, in the case of such a conventional sheet conveying apparatus, the switching position of the branch pawl is switched while the sheet material is passing through the branch pawl of the sheet conveying apparatus. In some cases, inconvenience may occur.

That is, as shown in FIG. 6, for example, the sheet conveying device is provided in a reversing section for switching the traveling direction of the sheet material P in the reverse direction in order to reverse the sheet material P after image formation on one side. In this case, the sheet material P is conveyed to the receiving port 64b of the conveyance path switching member 64 which operates in the same manner as the branch claw at the pivot position shown in FIG.
Is conveyed in the direction of arrow E by the reversing roller 66 and passes through the conveyance path switching member 64, the switching position of the conveyance path switching member 64 is switched as shown in FIG. If the end is detected by a sensor 63 fixed to a fixed entrance upper guide plate 69 of the sheet conveying device, and the timing of reverse rotation of the reversing roller 66 is controlled based on the detection timing, the reverse There is a problem that a large variation occurs in the reversal timing for rotating the roller 66 in the reverse direction.

[0006] This is because the sensor 63 is connected to the entrance upper guide plate 69.
When the transport path switching member 64 is at the rotation position shown in FIG. 6, the sheet material P is at a position close to the sensor 63 because it is transported along the upper guide plate 69. Therefore, the sheet material P is accurately detected by the sensor 63.

However, when the sheet material P is transferred to the conveyance path switching member 6
When the transport path switching member 64 is switched to the rotation position shown in FIG.
Moves toward the lower entrance guide plate 68 and is pressed against the lower entrance guide plate 68, so that it is largely separated from the sensor 63. Therefore, if the reversal timing of the reversing roller 66 is controlled based on the timing at which the trailing edge of the sheet material P is detected in this state, large variations occur in the timing.

In this case, the rear end of the sheet material P is
Unless the position of the conveyance path switching member 64 is switched until the detection position passes, the variation in the reversal timing of the reversing roller 66 does not occur. However, switching the rotation position of the conveyance path switching member 64 as shown in FIG. 7 while the sheet material P is passing through the conveyance path switching member 64 as described above causes curling after fixing. This is useful for correcting the curl of the sheet material.

That is, when a sheet material immediately after fixing an image is generally fed immediately into a curved conveyance path, the sheet material easily curls, resulting in a paper jam or an ear failure. Although it is easy to break,
If the rotation position of the conveyance path switching member 64 is switched while the sheet material P is passing through the conveyance path switching member 64 in this way, the sheet material P immediately after the fixing can be changed as shown in the drawing. The curl can be removed by being conveyed while being squeezed by the guide plate 64 and the lower entrance guide plate 68 (decurl mechanism).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is intended to change the rotation position of the transport path switching member while the sheet material is passing through the transport path switching member of the transport direction switching mechanism. Even if the sheet material is switched to the extreme side, the position of the rear end of the sheet material conveyed on the conveyance path can be accurately detected by the sensor even after the rotation position of the conveyance path switching member is switched. The purpose is to do.

[0011]

In order to achieve the above object, the present invention provides a transport direction switching mechanism for switching the transport direction of a sheet material transported on a transport path by a transport path switching member, and a transport direction switching mechanism for transporting the sheet material on the transport path. And a sensor for detecting the sheet material to be switched, and wherein the sheet material is capable of switching the switching position of the transport path switching member while the sheet material is passing through the transport path switching member. It is mounted on a member or a member integral with the transport path switching member so as to move integrally with the transport path switching member.

It is preferable that the transport path switching member is rotatably supported around a rotation center of a transport roller guided by the transport path switching member. It is effective that the transport direction switching mechanism is provided in a reversing branching section that switches the traveling direction of the sheet material in the reverse direction in order to reverse the sheet material.

Preferably, the transport roller is a reverse transport roller for switching the traveling direction of the sheet material in a reverse direction in order to reverse the sheet material.
Further, the image forming apparatus may include any one of the above-described sheet conveying apparatuses.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment in which a sheet conveying device according to the present invention is applied to a reversing conveying device together with a control system. FIG. 2 also shows an image forming apparatus equipped with the reversing conveying device, except for the conveying system. FIG.

The image forming apparatus shown in FIG. 2 has a reverse conveying device 2 as a sheet conveying device mounted on the right side of the apparatus main body 1 in FIG. The reversing conveyance device 2 is a device used when forming an image also on the back surface of a sheet material on which an image is formed on the front surface (first surface). 1 and re-feed.

A post-processing device 3 for performing stapling by a stapler 23 is provided on the left side of the apparatus main body 1.
Is installed. Further, above the apparatus main body 1, a transport section 5 for transporting the sheet material to the post-processing apparatus 3 by a plurality of pairs of relay transport rollers, a relay discharge roller 7 for discharging the sheet material to the stacker 6, and The relay conveyance device 4 including the relay branch claw 27 for switching the conveyance path is mounted.

At the lower part of the apparatus main body 1, there is provided a paper feeding device, in which a paper feeding cassette 8 for storing the sheet materials P in a stacked state and a sheet material P in the paper feeding cassette 8 are vertically arranged. A paper feed roller 10 to be sent to the transport path 9 is provided. In the vertical transport path 9, a pair of registration rollers 12, a drum-shaped photoconductor 13 rotating in a direction indicated by an arrow A, and a fixing device 1 are provided.
4 are provided along the conveying direction of the sheet material.

On the downstream side of the fixing device 14 in the sheet conveying direction, a branching claw 15 is disposed so as to be able to switch its turning position. The vertical conveying path 9 is moved in accordance with the turning position of the branching claw 15. The sheet material to be conveyed is selectively conveyed to a paper discharge conveyance path 16 and a re-feed side conveyance path 17.

A pair of discharge rollers 18 are provided at the discharge port of the discharge conveyance path 16, and a pair of branch rollers 19 are provided at the re-feed side conveyance path 17.
Immediately after the above, a branch sensor 20 is provided. further,
On the downstream side of the branch sensor 20 in the sheet material conveyance direction, there are a plurality of paper discharge ports (not shown in FIG. 2), and the sheet material is guided to a paper discharge device mounted on the upper portion of the apparatus main body 1. An enabling branch claw upper 28 is provided.

The post-processing device 3 includes a plurality of paired finisher rollers 21 and the finisher rollers 2.
1 is a finisher discharge tray 22 for stacking the sheet material conveyed by the first and discharged from the finisher discharge port.
A finisher branching claw 24 for switching a sheet material conveyance path, and a conveyance belt 25 stretched between a plurality of rollers.
And The description of the reversing transport device 2 will be described later.

In this image forming apparatus, when the image forming operation is started, the sheet material P in the sheet feeding cassette 8 is separated into one sheet and sent out to the vertical conveying path 9 by the sheet feeding roller 10.
The sheet material P is temporarily stopped by the registration roller 12, and the image forming operation is started at a predetermined timing, so that the sheet material P matches the image on the photoconductor 13 on which the image (toner image) is already formed. At an accurate timing, the sheet is conveyed toward a transfer position where the transfer roller 26 is located.

Then, the image on the photosensitive member 13 is transferred to the sheet material P by the transfer roller 26. After the image is fixed on the sheet material P by the fixing device 14, if the one-side mode in which the image is formed on only one side is selected, the branch claw 15 is rotated in the counterclockwise direction in FIG. Since it is at the position, it is conveyed to the paper discharge conveyance path 16. Then, it is sent to the relay conveyance device 4 by the paper discharge rollers 18.
The sheet material P is sent to the post-processing device 3 by the relay conveyance device 4.
And is discharged from a finisher discharge port to a finisher discharge tray 22 by a plurality of finisher rollers 21.

Alternatively, after passing through the finisher roller 21 on the entrance side, the path is switched by the finisher branching claw 24 and conveyed to the conveyor belt 25 side, where it is conveyed downward by switchback and stopped at a predetermined staple position. After the sheets are bound by the sheet 23, the sheets are discharged from the finisher discharge port to the finisher discharge tray 22. It should be noted that the relay branching claw 27 is
, The sheet material after image formation can be immediately discharged to the stacker 6 by the relay discharge roller 7 without being conveyed to the post-processing device 3.

On the other hand, when the duplex mode for forming an image on both sides of the sheet material is selected, the branch claw 15 is
To the position rotated clockwise. Therefore, the sheet material on which an image is formed on one side is conveyed to the re-feeding side conveyance path 17, and is conveyed into the reverse conveyance device 2 by the conveyance force of the branch roller 19.

After the image is formed on one side, the reversing conveyance device 2 moves from the main assembly 1 to the conveyance path 41 as shown in FIG.
A transport direction switching mechanism 30 for switching the transport direction of the sheet material P fed into the transport path by the transport path switching member 34, and a sensor 43 for detecting the sheet material P transported on the transport path 41 are provided. While passing through the transport path switching member 34, the switching position of the transport path switching member 34 can be switched to the position shown in FIG.

As shown in FIG. 2, the reverse transport device 2 includes a transport system 31 for transporting the sheet material whose transport direction has been switched by the transport direction switching mechanism 30, a switchback transport path 32, and a vertical transport. A road 45 is also provided. The transport path switching member 34 shown in FIG. 1 is supported by a shaft 33 so as to be rotatable about the rotation center of the reversing roller 36, and it is moved by a solenoid 35 to the switching position shown in FIG. It can be switched to the indicated switching position.

The reversing roller 36 is provided at the entrance of the switchback conveyance path 32, and the sheet material conveyed along the conveyance path 41 toward the switchback conveyance path 32 is guided there by the conveyance path switching member 34. I'm going. And
The reversing roller 36 is a transport roller that is rotatable in both forward and reverse directions for reverse transport for switching the traveling direction of the sheet material in the reverse direction in order to reverse the sheet material, and is supported by the shaft 33.

The transport path switching member 34 has one end of a spring 38 attached to a hook 34a formed at one end, and the other end of the spring 38 attached to a fixed portion (not shown) of the reverse transport device 2. . Therefore, when the solenoid 35 is turned off, the conveyance path switching member 34 is brought to the switching position shown in FIG. When the solenoid 35 is turned on, the transport path switching member 34 is rotated in the opposite direction against the urging force of the spring 38, and thus the switching position shown in FIG.

FIG. 4 shows an upper surface of the transport path switching member 34.
As shown in FIG. 7, an opening 34d for transmitting light from the sensor 43, for example, a reflection type photo sensor, is formed. As shown, two mounting holes 46a and 46b are formed in the support plate 46 which is bent at substantially right angles in two steps, and one of the mounting holes 46b is a screw hole.

The sensor 43 includes an element part 43a having a light emitting element and a light receiving element, a holding part 43b for integrally holding the element part 43a, and one end of the holding part 43b and one lead. The holding portion 43b is provided with an engaging projection 43d and a hole 43e corresponding to the mounting holes 46a and 46b.

Then, the engaging projection 43d is connected to the support plate 46.
The sensor 43 is integrated with the support plate 46 by inserting a screw 47 into the hole 43e from below and screwing the screw 47 into the mounting hole 46b of the support plate 46. It is fixed to. The support plate 46 integrally fixes the mounting surface portion 46c to the upper surface of the transport path switching member 34 by, for example, welding. When the support plate 46 is fixed to the transport path switching member 34, the element portion 43a opens the opening 34d. To the position corresponding to.

As described above, in the reversing conveyance device 2, the sensor 43 is integrally attached to the conveyance path switching member 34 via the support plate 46, and the sensor 43 rotates integrally with the conveyance path switching member 34. I have to. In the above-described embodiment, the sensor 43 is fixed to the transport path switching member 34 via the support plate 46, which is an integral member of the transport path switching member 34. A mounting seat may be formed on the upper surface of the member 34 by pressing a press or the like, and the holding portion 43b may be directly fixed to the mounting seat by screwing or the like.

The transport system 31 shown in FIG.
6, a driven roller 37 pressed against it, and a plurality of pairs of transport rollers 31 a, 31 b, and 31 c. The sheet material that has passed the transport direction switching mechanism 30 is transported to the apparatus main body 1 again.

Further, as described above, the reversing conveyance device 2 switches the switching position of the conveyance path switching member 34 to the position shown in FIG. 3 while the sheet material is passing through the conveyance path switching member 34. The switching is controlled by the control device 50 shown in FIG.
The control device 50 includes a central processing unit (CPU) having various determination and processing functions, a ROM storing each processing program and fixed data, a RAM serving as a data memory for storing processing data, and an input / output circuit (I / O).

The control device 50 includes a sensor 4 provided to face the transport path 41 at the entrance of the reverse transport device 2.
3 inputs a signal to detect and output the sheet material. Then, a signal for operating the solenoid 35 is output to the solenoid 35 at a predetermined timing. Although not shown in FIG. 1, various signals are also input from other sensors. Then, a signal for rotating the reversing roller 36 forward or backward is output to the driving system of the transport system 31 (FIG. 2) at a predetermined timing.

In the reversing conveyance device 2, the sheet material on which an image is formed on one side is conveyed to the re-feeding side conveyance path 17 shown in FIG. When the branch sensor 20 detects, the solenoid 35 is turned on, so that the transport path switching member 34 switches from the normal switching position shown in FIG. 3 to the sheet inlet port 34b as shown in FIG. Switch to position.

The solenoid 35 is turned off at a timing after the leading end of the sheet material has passed through the nip between the reversing roller 36 and the driven roller 37. The timing control is performed, for example, after a lapse of a predetermined time after the sensor 43 detects the leading end of the sheet material, that is, the distance from the detection position by the sensor 43 to the nip between the reversing roller 36 and the driven roller 37 and the conveyance of the sheet material. Sensor 43 determined by speed
Is a predetermined time after a time from when the leading edge of the sheet material is detected to when the leading edge reaches the nip is added with a margin time in consideration of variations and the like.

When the solenoid 35 is turned off,
The conveying path switching member 34 is rotated in the direction indicated by the arrow B in FIG. 1 by the urging force of the spring 38, and comes to the switching position shown in FIG. At this time, since the reversing roller 36 continues to rotate in the direction of arrow C, the sheet material P passing through the transport direction switching mechanism 30 is transported by the transport path switching member 3 as shown in the figure.
4 and is conveyed in the direction of arrow E while being squeezed by the entrance lower guide plate 39.

Therefore, in general, when the sheet material immediately after the fixing of the image is immediately sent to the curved conveyance path, the sheet material is easily curled, resulting in a paper jam or a sheet jam. Although the edge of the sheet is likely to be broken or the image is rubbed easily, according to the reversing conveyance device 2, the sheet P immediately after the fixing is conveyed by the conveyance direction switching mechanism 30 as shown in FIG. Since the curl is removed by transporting the member 34 and the lower guide plate 39 while squeezing, the above-described problem can be prevented from occurring.

The timing at which the solenoid 35 is turned off is determined by the sheet material P conveyed to the conveyance direction switching mechanism 30.
Is passed through the nip between the reversing roller 36 and the driven roller 37, so that even if the sheet material P is conveyed while being squeezed, the sheet material P can be conveyed in a stable state. , Skew, paper jam and the like can be suppressed. Then, the rear end of the sheet material P conveyed to the conveyance path 41 in the reverse conveyance device 2 is detected by a sensor 4.
When 3 is detected, the reversing roller 36 temporarily stops rotating in the direction indicated by the arrow C in FIG. 3 and then reversely rotates in the direction indicated by the arrow in FIG.

As a result, the sheet material P is transported in a switchback manner with the rear end side up to the leading end side, and is transported downward in the vertical transport path 45 in FIG. At 31c, the sheet is again conveyed to an image forming section having the photoconductor 13 via the registration roller 12 in the apparatus main body 1, and an image (toner image) is formed on the back surface of the sheet material in the same manner as when an image is formed on the front surface. Is transferred and, after fixing, is discharged to the relay conveying device 4 or the post-processing device 3 according to the selected content.

By the way, in the image forming apparatus according to this embodiment, as described above, the sheet material is
In the course of passing through the transport path switching member 34, the switching position of the transport path switching member 34 is switched to remove the curl by squeezing the sheet material.
Since the normal switching position of No. 4 (the position shown in FIG. 3) is on the switching position side where the solenoid 35 is not energized, the ON time of the solenoid 35 is shortened.
The service life can be extended, and energy can be saved.

In this image forming apparatus, the transport path 41
A sensor 43 for detecting a sheet material conveyed is integrally attached to the conveyance path switching member 34 via a support plate 46,
Since the sheet material is moved integrally with the transport path switching member 34, the sheet material is transported by the transport direction switching mechanism 3 as described above.
Even if the rotation position of the conveyance path switching member 34 is switched while passing through the conveyance path switching member 34 of
Since the sensor 43 moves integrally with the conveyance path switching member 34, as shown in FIG.
3 can always be kept substantially constant.

Accordingly, even if the stop and drive timing of the reversing roller 36 is controlled based on the timing at which the sensor 43 detects the position of the rear end of the sheet material as described above, Stop and drive timings do not vary greatly. In this way, the accuracy of the stop position of the sheet material can be improved in the reversing conveyance device 2, and the length La of the conveyance guide portion 34e of the conveyance path switching member 34 can be shortened. The size can be reduced.

In order to effectively remove the curl formed on the sheet material, the respective transport speeds of the reversing roller 36 and the transport rollers 31a to 31c constituting the transport system 31 are transmitted to the transport direction switching mechanism 30. The conveying speed of the sheet material at the time of feeding, that is, the conveying speed of the branch roller 19 (FIG. 2) of the apparatus main body 1 may be set faster. Then, the back tension is applied to the sheet material that has been conveyed by the branch roller 19 and has reached the nip between the reversing roller 36 and the driven roller 37 at the leading end, so that the curl can be more effectively removed. it can.

Since the degree of curl of the sheet material conveyed to the conveyance direction switching mechanism 30 differs depending on the type of paper, the solenoid 35 is driven to switch the conveyance path switching member 34 to the rotation position shown in FIG. It is effective to make the timing different depending on the paper type. For example, when using a sheet material of a paper type in which the degree of curl tends to be large, the timing at which the solenoid 35 is turned off (the transport path switching member 34 is brought to the rotation position shown in FIG. 3) is determined by the sheet material. Reversing roller 36 and driven roller 3
Immediately after reaching the nip with 7.

Conversely, when using a sheet material of a paper type that tends to have a relatively small degree of curl, the timing for turning off the solenoid 35 is delayed as compared with the above case, and By squeezing only the end with the conveyance path switching member 34 and the lower entrance guide plate 39, it is possible to remove the curl formed on the sheet material by applying a minimum load to the sheet material. it can.

As described above, the sheet conveying apparatus according to the present invention is applied to the reversing conveying apparatus 2, and the curled sheet material is pressed by the conveying path switching member 34 of the conveying direction switching mechanism 30 to remove the curl. Although the example of the case has been described, a configuration in which the rotating position of the member for switching the transport path is switched while the sheet material is passing through the member for switching the transport path is described in a branch in the apparatus main body 1 shown in FIG. Nail 1
5, a transfer direction switching mechanism having branch claws such as the relay branch claw 27 and the finisher branch claw 24.

If so, the finisher discharge tray 22
Since the curl is removed from the sheet material discharged to the stacker 6, the stacking property is improved. Further, the image forming apparatus shown in FIG. 2 is provided with a branch claw upper 28 in the re-feeding side conveyance path 17 in the apparatus main body 1, and the branch claw upper 28 can be mounted above the apparatus main body 1. The sheet material can be selectively guided to a paper ejection device (not shown) equipped with a plurality of paper ejection ports. If the rotation position is switched to make the sheet material stiff as described above,
Paper jams due to curls, broken ears, image distortion, and the like can be reduced as in the case of the inside. Further, the stacking property of the sheet material on the tray of the sheet discharging device is also improved.

[0050]

As described above, according to the present invention, the following effects can be obtained. According to the sheet conveying apparatus of the first aspect and the image forming apparatus of the fifth aspect, the sensor for detecting the sheet material conveyed on the conveying path is attached to the conveying path switching member or a member integral with the conveying path switching member. Since the sheet is moved integrally with the conveyance path switching member, the rotation position of the conveyance path switching member may be switched while the sheet material is passing through the conveyance path switching member of the conveyance direction switching mechanism. Since the sensor moves integrally with the conveyance path switching member, the distance between the sheet material being conveyed and the sensor can be kept substantially constant.

Therefore, even if the timing of stopping or driving the transport rollers on the transport path is controlled based on the timing at which the position of the rear end of the sheet material is detected by the sensor, the stop or drive of the transport rollers can be controlled. Can be prevented from greatly varying. Thereby, the accuracy of the stop position of the sheet material when the transport roller is stopped is improved, and the length of the transport guide portion of the transport direction switching mechanism can be shortened, so that the apparatus can be downsized.

According to the second aspect of the present invention, since the transport path switching member is rotatably supported with the rotation center of the transport roller as a fulcrum, the surface of the transport path switching member for guiding the sheet material can be used. Since the sheet can always be positioned in the tangential direction of the conveyance roller, the sheet material can be stably guided by the conveyance path switching member. Further, it is not necessary to extend the length of the guide portion of the transport path switching member more than necessary, so that the apparatus can be downsized.

According to the third aspect of the present invention, the stop position accuracy of the sheet material to be reversed can be improved, and the length of the reverse conveyance path can be shortened by the reduction in the variation of the stop accuracy. Therefore, the size of the reversing unit can be reduced.

According to the sheet conveying apparatus of the fourth aspect, since the conveying path switching member is rotatable about the rotation center of the reverse conveying conveying roller, the surface of the conveying path switching member for guiding the sheet material is used. Can always be positioned in the tangential direction of the transport roller, so that the sheet material whose traveling direction has been switched to the reverse direction can be stably transported reversely.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment in which a sheet conveying apparatus according to the present invention is applied to a reverse conveying apparatus, together with a control system.

FIG. 2 is a schematic configuration diagram showing an image forming apparatus equipped with the reversing conveyance device, omitting illustrations other than a conveyance system.

FIG. 3 is a schematic diagram showing a state in which a sheet path switching member provided in the reversing sheet conveying device is rotated to switch a sheet material to an extremely high position.

FIG. 4 is a perspective view for explaining a mounting structure of a sensor mounted on the upper surface of the transport path switching member.

5 is a schematic diagram similar to FIG. 3 showing a state in which the conveying direction of the sheet material sent to the reverse conveying device shown in FIG. 1 is reversed.

FIG. 6 is a schematic diagram showing a state where a sheet material is fed into a conventional reverse conveyance device.

FIG. 7 is a schematic diagram similar to FIG. 6, showing a state in which the sheet material is rotated to a position where the sheet material is extremely moved while the sheet material is passing through the conveyance path switching member of the reversing conveyance device. It is.

[Explanation of symbols]

 2: reverse transport device (sheet transport device) 30: transport direction switching mechanism 33: shaft 34: transport route switching member 36: reverse roller (transport roller) 41: transport route 43: sensor 46: support plate P: sheet material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H072 AA09 AA16 AA24 AA32 AB07 BA12 CA01 CA02 CB01 GA08 3F048 AA03 AA05 AB01 BA05 BB02 CC04 DA06 DC14 3F049 AA10 DA11 DA12 EA17 EA27 LA03 LA07 LB03 3F05 EA03 EA03 EA03 EA03 EA03 EA03 LB03

Claims (5)

[Claims] A transport direction switching mechanism for switching a transport direction of a sheet material transported on a transport path by a transport path switching member; and a sensor for detecting the sheet material transported on the transport path. In a sheet conveying apparatus capable of switching a switching position of the conveyance path switching member while passing through the conveyance path switching member, the sensor is attached to the conveyance path switching member or a member integral with the conveyance path switching member. A sheet conveying apparatus, wherein the sheet conveying apparatus moves integrally with a conveying path switching member. 2. The image forming apparatus according to claim 1, wherein the transport path switching member is rotatably supported about a rotation center of a transport roller guided by the transport path switching member. The sheet conveying device according to claim 1, wherein: 3. The sheet conveyance device according to claim 1, wherein the conveyance direction switching mechanism is provided in a reversing branch portion that switches a traveling direction of the sheet material in a reverse direction in order to reverse the sheet material. apparatus. 4. The sheet transport apparatus according to claim 2, wherein the transport roller is a reverse transport transport roller that switches a traveling direction of the sheet material to a reverse direction to reverse the sheet material. 5. An image forming apparatus comprising the sheet conveying device according to claim 1. Description: