JP2019179262A - Drive transmission device and image forming apparatus including the drive transmission device - Google Patents

Abstract

To provide a drive transmission device that can reduce an occupied space in an outer diameter direction of a rotation shaft.SOLUTION: A drive transmission device comprises: a first input-side rotating body 11 and a second input-side rotating body 12 on an input-side rotation shaft 1; an input-side clutch 5; a first output-side rotating body 21 and a second output-side rotating body 22 on an output-side rotation shaft 2; an output-side clutch 6; and a drive gear 3 that transmits a driving force to the first input-side rotating body 11 and first output-side rotating body 21, where the first input-side rotating body 11 and first output-side rotating body 21 rotate in the opposite directions, while the second input-side rotating body 12 and second output-side rotating body 22 rotate in the same direction, and the direction of rotation of the second input-side rotating body 12 and second output-side rotating body 22 is changed to the normal/reverse directions in association with changing operations of the clutches 5, 6, and where the output-side rotation shaft 2 transmits a driving force to a paper ejection roller 161 that can rotate in the normal/reverse directions, and a normal rotation drive transmission path normally rotating the paper ejection roller 161 and a reverse drive transmission path reversely rotating the paper ejection roller 161 merge on the output-side rotation shaft 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drive transmission device capable of switching between forward rotation and reverse rotation of an output rotation, and an image forming apparatus including the drive transmission device.

2. Description of the Related Art Conventionally, there is known a drive transmission device that receives output rotation from one motor and transmits the rotation by rotating it forward and backward to an output shaft (for example, Patent Document 1).
This prior art has two paths as drive transmission paths from a drive input gear meshed with a gear to which rotation is input from a motor to a drive output gear that transmits the rotation to the driven body.
The first path is a path that is transmitted from the drive input gear to the drive output gear via a forward rotation clutch that is fastened at the time of forward rotation output and released at the time of reverse rotation output.
The second path is a path that is transmitted from the drive input gear to the drive output gear via the counter gear, and further via a reverse rotation clutch that is released at the time of forward rotation output and released at the time of reverse rotation output.
As described above, since the number of intervening gears is different between the first path and the second path, the rotation of the drive output gear is rotated forward and backward while driving one motor in a single rotation direction. It can be transmitted selectively.

However, in the above-described prior art, the counter gear and both clutch input gears are provided in the outer diameter direction of the drive input gear, and the output gears of both clutches are provided in the outer diameter direction. The structure is provided with a drive output gear.
As described above, since the two gears including a plurality of gears are arranged in the outer diameter direction of the rotation shaft from the drive input gear, there is a problem that the occupied space in the outer diameter direction of the device increases. It was.

  The present invention has been made paying attention to the above-described conventional problems, and provides a drive transmission device capable of reducing the occupied space in the outer diameter direction of a rotating shaft and an image forming apparatus including the drive transmission device. It is in.

In order to achieve the above object, the present invention provides:
A first rotation axis;
A first rotating body and a third rotating body provided on the first rotating shaft;
A first drive switching unit that switches between drive transmission and drive cutoff between the first rotating shaft and the first rotating body or between the first rotating shaft and the third rotating body;
A second rotation axis;
A second rotating body and a fourth rotating body provided on the second rotating shaft;
A second drive switching unit that switches between drive transmission and drive cutoff between the second rotary shaft and the second rotary body, or between the second rotary shaft and the fourth rotary body;
A drive transmission rotating body that transmits a driving force from a driving source to the first rotating body and the second rotating body;
The first rotating body and the second rotating body are configured to rotate in opposite directions, while the third rotating body and the fourth rotating body are configured to rotate in the same direction. And
Drive transmission in which the rotation direction of the third rotating body and the fourth rotating body is switched between forward and reverse directions in accordance with the switching operation of the first drive switching unit and the second drive switching unit when the drive source is operated. A device,
The second rotating shaft is configured to transmit a driving force to a driven rotating body capable of rotating in the forward and reverse directions, and a forward rotation driving transmission path for rotating the driven rotating body in a forward direction, and the driven rotating body The reverse rotation drive transmission path for reversing the rotation is a drive transmission device characterized by merging at the second rotation shaft.

According to the drive transmission device of the present invention, the output side rotation shaft on the output side transmits the drive only from the input side rotation shaft, and the input side drive switching unit and the output side drive switching unit are the shafts of both rotation shafts. Provided between the directions.
For this reason, the number of gears engaged in the radial direction can be reduced and the occupied space in the outer radial direction can be reduced compared to the case where the rotational direction of the drive transmission is switched due to the difference in the number of gears that perform the drive transmission arranged in the radial direction. Is possible.

FIG. 1 is a configuration explanatory view showing a schematic configuration of an image forming apparatus to which the drive transmission device of Embodiment 1 of the present invention is applied. 2A and 2B are explanatory diagrams showing a drive transmission state at the time of forward rotation output of the drive transmission device of the first embodiment. FIG. 2A shows a state seen from a direction along the rotation axis, and FIG. The state seen from radial direction is shown. FIG. 3 is an explanatory diagram showing a drive transmission state at the time of reverse rotation output of the drive transmission device of the first embodiment, where (a) shows a state seen from a direction along the rotation axis, and (b) shows a diameter of the rotation shaft. The state seen from the direction is shown. FIG. 4 is an explanatory view showing a drive transmission state at the time of forward rotation output of the drive transmission device of the second embodiment, and shows a cross-sectional state seen from the radial direction of the rotating shaft. FIG. 5 is an explanatory diagram showing a drive transmission state at the time of reverse rotation output of the drive transmission device of the second embodiment, and shows a cross-sectional state viewed from the radial direction of the rotating shaft.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a schematic configuration of an image forming apparatus 100 including a drive transmission device A according to the first embodiment of the present invention.
As shown in FIG. 1, the image forming apparatus 100 includes an automatic document feeder 110, a reading device 120, an image forming device 130, a fixing device 140, a paper feeding device 150, a paper discharging device 160, and a refeeding device 170. Yes.

  In this embodiment, the automatic document feeder 110 has a document feeding mechanism that supports sheet-through reading. The reading device 120 is a well-known device that reads a document fed to the reading position by the automatic document feeder 110 while it is being conveyed.

  The image forming device 130 is a known device including a photoconductor, a charging charger, an optical writing unit, a developing unit, a transfer unit, a cleaning unit, and a charge eliminating unit. In other words, the image forming device 130 forms a latent image on the photosensitive member to which a potential is applied by the charging charger by the optical writing unit, and a toner image obtained by developing the latent image on the recording paper by the transfer unit. Transcript to. The toner remaining without being transferred is cleaned by the cleaning unit, and the potential remaining on the surface of the photoreceptor is returned to zero potential by the slow current unit.

The fixing device 140 includes a fixing roller having a pair of a pressure roller and a heat roller.
The paper feeding device 150 pulls out the recording papers collected in the paper feeding cassette one by one and sends them to the transfer unit side of the image forming device 130.
The paper discharge device 160 can discharge the recording paper conveyed from the fixing device 140 to the paper discharge tray 163 and switch back to the paper refeed device 170 side.
That is, the paper discharge device 160 includes a pair of paper discharge rollers 161 and 161. When a paper discharge sensor (not shown) detects a nip state in which the end of the recording paper is sandwiched between the paper discharge rollers 161 and 161, The paper discharge rollers 161 and 161 are reversed to be supplied to the paper refeed device 170.

  The sheet re-feed device 170 forms a recording sheet that has been imaged by the image forming device 130 and is nipped between the discharge rollers 161 and 161 of the discharge device 160 on the back surface thereof via a switchback path 171 indicated by a dotted line. The transfer direction is supplied to the image forming apparatus 130. The pair of paper discharge rollers 161 and 161 have a structure in which both of them rotate reversely with respect to the rotation input by meshing the external gear.

In the image forming apparatus 100 described above, the drive transmission device A according to the first embodiment is used for forward and reverse rotation of the paper discharge roller 161 of the paper discharge device 160 described above.
Hereinafter, the drive transmission device A will be described with reference to FIGS.
As shown in FIGS. 2 and 3, the drive transmission device A includes an input-side rotary shaft 1 that is rotationally input from a motor (not shown), and an output-side rotary shaft 2 that rotates and outputs to the paper discharge roller 161. Yes.

  The input-side rotating shaft 1 includes a first input-side rotating body 11 and a second input-side rotating body 12 coaxially, and a rotation center shaft 31 of a drive gear 3 that is rotationally input from a motor (not shown) that is a drive source. Is arranged parallel to the axial direction.

The first input-side rotating body 11 is an external gear that is coupled to the input-side rotating shaft 1 so as to be integrally rotatable, and a gear 11 a that meshes with the drive gear 3 is formed on the outer periphery.
The second input-side rotator 12 is a pulley that transmits drive to the belt 4 by friction, and is provided with an input-side clutch 5 interposed between the input-side rotary shaft 1 and the pulley. Therefore, the second input-side rotating body 12 rotates integrally with the input-side rotating shaft 1 when the input-side clutch 5 is engaged, and idles with respect to the input-side rotating shaft 1 when the input-side clutch 5 is released.
That is, the input-side clutch 5 is provided on the input-side rotary shaft 1 as an input-side drive switching unit that switches between a drive transmission state and a transmission cutoff state between the first input-side rotator 11 and the second input-side rotator 12. ing.

  The output-side rotating shaft 2 is disposed in parallel with the input-side rotating shaft 1 at a position in the outer diameter direction of the input-side rotating shaft 1. Further, the rotation of the output-side rotary shaft 2 is transmitted to the paper discharge roller 161.

Further, a first output side rotating body 21 and a second output side rotating body 22 are provided coaxially with the output side rotating shaft 2.
The first output-side rotator 21 is constituted by an external gear having a gear 21 a meshing with the gear 11 a of the first input-side rotator 11 on the outer periphery, and is provided on the output-side rotary shaft 2 via the output-side clutch 6. ing. Therefore, the first output-side rotator 21 rotates integrally with the output-side rotary shaft 2 when the output-side clutch 6 is engaged, and idles with respect to the output-side rotary shaft 2 when the output-side clutch 6 is released.
That is, the output-side clutch 6 is provided on the output-side rotary shaft 2 as an output-side drive switching unit that switches between a drive transmission state and a transmission cutoff state between the first output-side rotator 21 and the second output-side rotator 22. ing.

  The second output side rotator 22 is a pulley that transmits drive to the belt 4 by friction, and is arranged at the same height in the axial direction so as to be able to transmit rotation via the second input side rotator 12 and the belt 4. It is provided integrally with the side rotary shaft 2. Note that gears may be formed on the inner circumference of the belt 4 and the outer circumferences of the rotating bodies 12 and 22 to form a meshing structure.

(Operation of Embodiment 1)
(For normal output)
At the time of forward rotation that rotates the output side rotating shaft 2 in the same direction as the drive gear 3 to which the rotation of the motor (not shown) is transmitted, the input side clutch 5 is released (OFF) and the output side clutch 6 is engaged ( ON).

  2A and 2B show how the driving force is transmitted during the forward rotation output. The rotation of the driving gear 3 in the direction of the arrow s11 is transmitted to the first input-side rotator 11, The input side rotating shaft 1 is transmitted in the reverse direction in the direction of the arrow s12. At this time, since the input side clutch 5 is released, the second input side rotating body 12 rotates idly with respect to the input side rotating shaft 1.

  On the other hand, on the output-side rotating shaft 2, the rotation of the first input-side rotating body 11 is transmitted to the first output-side rotating body 21, and the first output-side rotating body 21 rotates in the direction of the arrow s14, that is, rotates forward. . Further, the rotation of the first output-side rotating body 21 is transmitted to the output-side rotating shaft 2 via the output-side clutch 6, and the output-side rotating shaft 2 also rotates forward in the direction of the arrow s14.

  Therefore, the paper discharge roller 161 (see FIG. 1) connected to the output side rotation shaft 2 also rotates forward. At this time, the second output-side rotating body 22 rotates integrally with the output-side rotating shaft 2, and the rotation is transmitted to the second input-side rotating body 12 via the belt 4. At this time, since the second input-side rotating body 12 is disconnected from the input-side rotating shaft 1 by the input-side clutch 5 as described above, the second input-side rotating body 12 idles with respect to the input-side rotating shaft 1 rotating in the arrow s12 direction. Rotate in the direction of arrow s12b.

(During reverse output)
At the time of reverse rotation output in which the output side rotating shaft 2 is rotated in the reverse direction to the drive gear 3 to which the rotation of the motor (not shown) is transmitted, the input side clutch 5 is engaged (ON) and the output side clutch 6 is released (OFF) )
FIGS. 3A and 3B show how the driving force is transmitted during the reverse rotation output, and the rotation of the drive gear 3 in the direction of the arrow s11 is the first input side rotation as in the case of the normal rotation output. Transmitted to the body 11, the input side rotating shaft 1 is transmitted in the reverse direction in the direction of the arrow s12.
Since the input side clutch 5 is engaged during the reverse rotation output, the second input side rotating body 12 rotates integrally with the input side rotating shaft 1 in the direction of the arrow s12.

Further, the rotation of the second input-side rotator 12 is transmitted to the second output-side rotator 22 via the belt 4, and the second output-side rotator 22 and the output-side rotating shaft 2 are in the direction of the arrow s13. That is, it rotates in the direction opposite to the rotation direction (s11) of the drive gear 3. The paper discharge roller 161 connected to the output side rotation shaft 2 is also reversely rotated.
In the output-side rotating shaft 2, the rotation of the first input-side rotator 11 is transmitted to the first output-side rotator 21, and the first output-side rotator 21 rotates in the direction of the arrow s14, that is, rotates forward. . However, at this time, since the output side clutch 6 is released, the first output side rotating body 21 rotates idly with respect to the output side rotating shaft 2.

(Effect of Embodiment 1)
The effects of the first embodiment are listed below.
a) The drive transmission device of Embodiment 1 is
An input side rotating shaft 1 in which a first input side rotating body 11 and a second input side rotating body 12 are held coaxially;
The first output-side rotator 21 and the second input-side rotator 12 which are arranged at the outer diameter direction position of the first input-side rotator 11 and are transmitted in the reverse rotation direction from the first input-side rotator 11. A second output-side rotating body 22 that is disposed at the outer radial position and is transmitted in the same direction of rotation from the second input-side rotating body 12;
The input side rotary shaft 1 and the first input switching unit are provided on the input side rotary shaft 1 as an input side drive switching unit that switches between the drive transmission state and the transmission cutoff state between the first input side rotary body 11 and the second input side rotary body 12. Two input side clutches 5 provided between the two input side rotating bodies 12,
The output-side rotary shaft 2 and the second output-shaft are provided on the output-side rotary shaft 2 as an output-side drive switching unit that switches between the drive transmission state and the transmission cutoff state between the first output-side rotary body 21 and the second output-side rotary body 22. 1 output side clutch 6 provided between the output side rotating body 21;
It is characterized by having.
Thus, the input side rotating shaft 1 provided with both input side rotating bodies 11 and 12 coaxially and the output side rotating shaft 2 provided with both output side rotating bodies 21 and 22 coaxially arranged in parallel in the radial direction. And between the both 1 and 2, it was set as the structure which does not interpose the structure provided with rotating shafts, such as a gear which performs drive transmission.
Accordingly, it is possible to reduce the space occupied in the radial direction as compared with the case where the drive transmission member including the rotary shaft is interposed in the radial direction in addition to the rotary shafts 1 and 2. As a result, the degree of freedom in installation in the image forming apparatus 100 can be improved.

b) The drive transmission device of Embodiment 1 is
A discharge roller 161 is provided as a driven rotating body that is driven and transmitted from the output-side rotating shaft 2;
The output side clutch 6 as the output side drive switching unit is characterized in that it switches between a drive transmission state and a transmission cutoff state between the first output side rotating body 21 and the output side rotating shaft 2.
Therefore, the output side rotating shaft 2 can be rotated in the opposite direction to the input side rotating shaft 1 with the input side clutch 5 in the transmission cut-off state (released) and the output side clutch 6 in the drive transmission state (fastened). On the other hand, the output side rotating shaft 2 can be rotated in the same direction as the input side rotating shaft 1 by setting the input side clutch 5 in the drive transmission state (fastened) and the output side clutch 6 in the transmission cut-off state (released).
In this way, it is possible to transmit the driving force (rotation) to the paper discharge roller 161 as a non-drive rotator by rotating the rotation direction of the output side rotating shaft 2 forward and backward.

c) The drive transmission device of Embodiment 1 is
Means in which the drive transmission means of the first input-side rotator 11 and the first output-side rotator 21 meshes gears 11a and 21a as external gears formed on the outer circumferences of both rotators 11 and 21. And
The drive transmission means for the second input-side rotator 12 and the second output-side rotator 22 is a belt 4 wound around both.
Therefore, in the drive transmission via the first input-side rotator 11 and the first output-side rotator 21, the rotation is transmitted from the input-side rotating shaft 1 to the output-side rotating shaft 2 as a reverse rotation. On the other hand, in the drive transmission via the second input-side rotator 12 and the second output-side rotator 22, the rotation is transmitted from the input-side rotating shaft 1 to the output-side rotating shaft 2 as rotation in the same direction.
As described above, when the first input-side rotator 11 and the first output-side rotator 21 are used as the drive transmission system, and when the second input-side rotator 12 and the second output-side rotator 22 are used. Thus, the rotational direction between the rotary shafts 1 and 2 can be changed to the opposite direction.
In addition, when driving is transmitted through the belt 4, it is possible to expect quietness in a high-speed rotation region as compared with driving transmission through a plurality of gears.

d) The output-side rotary shaft 2 of the drive transmission device A of the first embodiment is characterized in that the drive transmission can be transmitted to the paper discharge roller 161 of the image forming apparatus 100.
Therefore, when the rotation direction of the discharge roller 161 is switched between forward rotation and reverse rotation, the rotation direction can be switched without changing the rotation direction of the motor, and the space occupied in the radial direction of the drive transmission device A can be suppressed. be able to.

(Embodiment 2)
Next, the drive transmission device B according to the second embodiment will be described with reference to FIGS.
Since drive transmission device B is a modification of the first embodiment, the same reference numerals as those in the first embodiment are given to the same components as those in the first embodiment, and the description thereof is omitted.

  As shown in FIGS. 4 and 5, the second input-side rotating body 212 provided coaxially with the input-side rotating shaft 201 is configured by an internal gear having a gear 212 a formed inside the outer peripheral edge. . The second input-side rotating body 212 is driven by the input-side clutch 205 so as to rotate integrally with the input-side rotating shaft 201 (fastened), and the transmission interrupted state where the input-side rotating shaft 201 idles (released). And can be switched.

  On the other hand, the second output-side rotating body 222 provided coaxially with the output-side rotating shaft 202 is constituted by an external gear having a gear 222a formed on the outer periphery, and the gear 222a is a gear of the second input-side rotating body 212. 212a.

(Operation of Embodiment 2)
(For normal output)
At the time of forward rotation that rotates the output side rotation shaft 202 in the same direction as the drive gear 3 to which the rotation of the motor (not shown) is transmitted, the input side clutch 205 is released (OFF) and the output side clutch 6 is engaged ( ON).

  FIG. 4 shows how the driving force is transmitted during the forward rotation output. The rotation of the driving gear 3 in the direction of the arrow s21 is transmitted to the first input-side rotating body 11, and the input-side rotating shaft 201 is , Transmitted in reverse in the direction of arrow s22. At this time, since the input side clutch 205 is released, the second input side rotating body 212 idles with respect to the input side rotating shaft 201.

  On the other hand, on the output side rotating shaft 202, the rotation of the first input side rotating body 11 is transmitted to the first output side rotating body 21, and the first output side rotating body 21 rotates in the direction of the arrow s23, that is, rotates forward. . Further, the rotation of the first output-side rotating body 21 is transmitted to the output-side rotating shaft 202 via the output-side clutch 6, and the output-side rotating shaft 202 also rotates forward.

  Accordingly, the paper discharge roller 161 (see FIG. 1) connected to the output side rotation shaft 202 also rotates forward. At this time, the second output-side rotating body 222 rotates integrally with the output-side rotating shaft 202, and the rotation is transmitted to the second input-side rotating body 212 via the gears 222a and 212a. At this time, since the second input-side rotating body 212 is disconnected from the input-side rotating shaft 201 by the input-side clutch 205 as described above, the second input-side rotating body 212 idles with respect to the input-side rotating shaft 201 and rotates in the arrow s24 direction. To do.

(During reverse output)
At the time of reverse rotation output in which the output side rotating shaft 202 is rotated in the reverse direction to the drive gear 3 to which the rotation of the motor (not shown) is transmitted, the input side clutch 205 is engaged (ON) and the output side clutch 6 is released (OFF). )
FIG. 5 shows a state of transmission of the driving force at the time of the reverse rotation output, and the rotation of the driving gear 3 in the direction of the arrow s21 is transmitted to the first input-side rotator 11 as in the normal rotation. The input side rotating shaft 201 is transmitted in the reverse direction in the direction of the arrow s22.
Since the input side clutch 205 is engaged during the reverse rotation output, the second input side rotating body 212 rotates integrally with the input side rotating shaft 201 in the direction of the arrow s22.

Further, the rotation of the second input-side rotator 212 is transmitted to the second output-side rotator 222 via the gears 212a and 222a, and the second output-side rotator 222 and the output-side rotator 202 are indicated by an arrow s25. , That is, in the direction opposite to the rotation direction of the drive gear 3 (s21). The paper discharge roller 161 connected to the output side rotation shaft 202 is also rotated in the reverse direction.
In the output-side rotating shaft 202, the rotation of the first input-side rotating body 11 is transmitted to the first output-side rotating body 21, and the first output-side rotating body 21 rotates in the direction of the arrow s23, that is, rotates forward. . However, at this time, since the output-side clutch 6 is released, the first output-side rotating body 21 idles with respect to the output-side rotating shaft 202.

Therefore, even in the second embodiment, the effects a) and b) are obtained.
In addition, the drive transmission device B of the second embodiment includes an internal gear in which the drive transmission means of the second input-side rotator 212 and the second output-side rotator 222 is formed on the second input-side rotator 212. , And a gear 222a as an external gear formed on the outer periphery of the second output side rotating body 222 are meshed with each other.
Therefore, the rotation of the input side rotating shaft 201 can be transmitted as the rotation in the same direction to the output side rotating shaft 202 via the second input side rotating body 212 and the second output side rotating body 222.
And since the 2nd input side rotary body 212 is an internal gear, compared with the case where the external gear meshes | engages, low noise and low vibration drive can be anticipated.

As a modification of the second embodiment, as shown in FIG. 5, the output gear 300 is meshed with the second output-side rotator 222, and the output gear 300 is used as a driven rotator. And may be provided coaxially.
Thus, it becomes possible to aim at the improvement of a design freedom by giving a variation to the output form from the output side rotating shaft 2. FIG.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment, A various deformation | transformation and substitution can be added in the range which does not deviate from the summary of this invention.

For example, in the embodiment, the example in which the drive transmission device of the present invention is used for drive transmission between the motor and the paper discharge roller in the image forming apparatus is shown, but the present invention is not limited to this.
Specifically, it is used for rotating an image carrier for visualizing a toner image in a developing unit of an image forming apparatus of an image forming apparatus, used for rotating an intermediate transfer belt in a transfer unit of the image forming apparatus, It can be used to rotate the photoreceptor of the image forming apparatus. Further, it can be used for rotation of a roller of a fixing device of the image forming apparatus.

In the embodiment, the input side drive switching unit is provided between the input side rotary shaft and the second input side rotary body. However, the first input side rotary body and the second input side rotary body are shown. The installation position is not limited to this as long as the drive transmission state and the transmission cutoff state are switched between the two.
For example, the input side drive switching unit may be provided in the middle of the input side rotation shaft, and transmission / cutoff may be performed between the first input side rotation body side and the second input side rotation body side on the input side rotation shaft. Or you may provide an input side drive switching part between a 1st input side rotary body and an input side rotating shaft.
More specifically, in the former case, the input-side rotating shaft 1 in the first embodiment is configured such that the first axis on the first input-side rotating body 11 side and the second input-side rotating body 12 side in the axial direction Two axes are arranged in series in the axial direction. Then, transmission / interruption of the driving force can be performed between the first shaft and the second shaft by the input side drive switching unit such as the input side clutch 5.
In the latter case, the structure shown in the first embodiment will be described. An input side drive switching unit such as the input side clutch 5 is provided between the input side rotating shaft 1 and the first input side rotating body 11, and both The driving force can be transmitted / cut off between 1 and 11.

In the embodiment, the output side drive switching unit is provided between the output side rotary shaft and the second output side rotary body. However, the first output side rotary body and the second output side rotary body are shown. As long as the drive transmission state and the transmission cut-off state are switched to each other, the present invention is not limited to this.
For example, the output side drive switching unit may be provided in the middle of the output side rotation shaft, and transmission / cutoff may be performed between the first output side rotation body side and the second output side rotation body side on the output side rotation shaft.
More specifically, the output-side rotating shaft 2 shown in the first embodiment includes the first shaft on the first output-side rotating body 21 side in the axial direction and the second shaft on the second output-side rotating body 22 side. Are arranged in series in the axial direction. Then, transmission / interruption of the driving force can be performed between the first shaft and the second shaft by the input side drive switching unit such as the output side clutch 6.
Or you may provide an output side drive switching part between a 2nd output side rotary body and an output side rotating shaft. In this case, the output-side rotating shaft is always rotated in the same direction as the first output-side rotating body, and the output from the output-side rotating shaft is performed from the second output-side rotating body.
More specifically, with the structure shown in the first embodiment, an input side drive switching unit such as the output side clutch 6 can be provided between the output side rotating shaft 2 and the second output side rotating body 22. . In this case, since the rotation direction of the output side rotating shaft 2 is one direction, the output from the output side rotating shaft 2 is the second output side as described in the modification of the second embodiment. This is performed from the rotating body 22. As described in the second embodiment, the rotation output can be a belt, a chain, or the like in addition to the meshing with the output gear 300.

  Furthermore, the rotation transmission means between the first input-side rotator and the first output-side rotator and the rotation transmission means between the second input-side rotator and the second output-side rotator are limited to those shown in the embodiment. Not. For example, it is also possible to use a belt or the like for driving transmission between the first input side rotating body and the first output side rotating body. In this case, in order to rotate in the reverse direction, the belt is crossed between the two rotating bodies and wound around each rotating body. An external gear can also be used for the rotation transmission means between the second input side rotator and the second output side rotator. In this case, in order to rotate both rotating bodies in the same direction, an external gear is interposed between them.

DESCRIPTION OF SYMBOLS 1 Input side rotating shaft 2 Output side rotating shaft 4 Belt 5 Input side clutch (input side drive switching part)
6 Output side clutch (Output side drive switching part)
11 First input-side rotator 12 Second input-side rotator 21 First output-side rotator 22 Second output-side rotator 100 Image forming apparatus 161 Paper discharge roller (driven rotator)
201 Input side rotary shaft 202 Output side rotary shaft 205 Input side clutch (input side drive switching unit)
212 Second input side rotating body 212a gear (internal gear)
222 Second output side rotating body 222a gear (external gear)
300 Output gear (driven rotor)
A Drive transmission device B Drive transmission device

JP 2010-023983 A

Claims (9)

A first rotation axis;
A first rotating body and a third rotating body provided on the first rotating shaft;
A first drive switching unit that switches between drive transmission and drive cutoff between the first rotating shaft and the first rotating body or between the first rotating shaft and the third rotating body;
A second rotation axis;
A second rotating body and a fourth rotating body provided on the second rotating shaft;
A second drive switching unit that switches between drive transmission and drive cutoff between the second rotating shaft and the second rotating body or between the second rotating shaft and the fourth rotating body;
A drive transmission rotating body that transmits a driving force from a driving source to the first rotating body and the second rotating body;
The first rotating body and the second rotating body are configured to rotate in opposite directions, while the third rotating body and the fourth rotating body are configured to rotate in the same direction. And
Drive transmission in which the rotation direction of the third rotating body and the fourth rotating body is switched between forward and reverse directions in accordance with the switching operation of the first drive switching unit and the second drive switching unit when the drive source is operated. A device,
The second rotating shaft is configured to transmit a driving force to a driven rotating body capable of rotating in the forward and reverse directions, and a forward rotation driving transmission path for rotating the driven rotating body in a forward direction, and the driven rotating body The reverse transmission transmission path for reversing the rotation is a drive transmission device characterized by merging at the second rotation shaft. The drive transmission device according to claim 1,
Both of the first rotating body and the second rotating body are external gears. The drive transmission device according to claim 2, wherein
The drive transmission device according to claim 1, wherein the first rotating body and the second rotating body are drivingly connected by mutually engaging external teeth. In the drive transmission device according to any one of claims 1 to 3,
The third transmission body and the fourth rotation body are coupled to each other by being wound around a belt. In the drive transmission device according to any one of claims 1 to 4,
The first drive switching unit switches drive transmission and drive cutoff between the first rotating shaft and the third rotating body. The drive transmission device according to claim 5, wherein
The second drive switching unit switches between drive transmission and drive cutoff between the second rotating shaft and the second rotating body. The drive transmission device according to any one of claims 1 to 6,
The drive transmission device, wherein the driven rotating body is a paper discharge roller of an image forming apparatus. In the drive transmission device according to any one of claims 1 to 7,
The drive transmission device, wherein the first drive switching unit and the second drive switching unit are electromagnetic clutches.   An image forming apparatus comprising the drive transmission device according to claim 1.