JP2022135238A - Oneway clutch - Google Patents

Abstract

To prevent vibration and noise resulting from the deterioration of a coaxial relationship between an inner member and an outer member, in an inscription gear type oneway clutch.SOLUTION: In a oneway clutch having a first rotation member having an inner gear and a first outer gear, a planetary gear rotatable and revolvable with respect to an axial line of the first rotating member, and a second rotating member having a lock part and a second outer gear, and rotatable with the axial line as a center, the first rotating member has a first recess, and the second rotating member has a first protrusion engaged with an internal peripheral face of the first recess. When molding the second rotating member, the second outer gear and the first protrusion are molded by using the same mold part at molding, and when the first rotating member and the second rotating member are engaged with each other, they are positioned by the fitment of the internal peripheral face of the first recess and an external peripheral face of the first protrusion.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a one-way clutch, and more particularly to an internal gear type one-way clutch.

2. Description of the Related Art Conventionally, as an internal gear type one-way clutch, one described in Patent Document 1 is known. This one-way clutch has a tubular outer member having an internal gear on its inner circumference, a planetary gear meshing with the internal gear, and an inner member accommodated inside the outer member.

The inner member is provided with a locking edge portion that meshes with the teeth of the planetary gear, and the engagement between the planetary gear and the locking edge portion restricts relative rotation between the inner member and the outer member. On the other hand, when the outer member tries to rotate in a specific direction with respect to the inner member, relative rotation between the inner member and the outer member is permitted by separating the planetary gear from the locking edge portion.

On the other hand, the components of the one-way clutch are molded from resin, and are generally molded by injection molding. Injection molding generally uses a mold having a first mold section (core section) and a second mold section (cavity section). A molded article is formed by pouring a resin into the mold with the first mold part and the second mold part closed and cooling the resin. The molded article is then removed by opening the first mold part relative to the second mold part.

JP 2017-198295 A

However, in the configuration of Patent Document 1, the inner member is provided with a cylindrical portion on the side wall from the side wall, which is a flange adjacent to the gear portion, toward the outer member side. In other words, since the gear portion and the cylindrical portion of the inner member are provided through a flange that is larger than the outer diameter of the gear, the gear portion and the cylindrical portion of the inner member are formed by the first mold portion ( core portion) and the second mold portion (cavity portion) are molded separately.

In general, since the first mold portion and the second mold portion are adjusted, the positional accuracy is high. In this case, the relative position accuracy between the gear of the inner member and the cylindrical portion varies.

As a result, the relative positions of the gear of the outer member and the gear of the inner member are deteriorated, and there is a possibility that the one-way clutch will vibrate when operated and abnormal noise will occur accordingly. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a one-way clutch capable of reducing the occurrence of vibration and noise.

One aspect of the present invention is a first rotating member having an internal gear on an inner peripheral portion and a first external gear on an outer peripheral portion, and a first rotating member that meshes with the internal gear, is rotatable and revolves around the axis of the first rotating member. a planetary gear, a locking portion that engages with the planetary gear to stop rotation, and a second external gear on the outer peripheral portion, and a second rotating member that can rotate about the axis; Relative rotation of the first rotating member and the second rotating member is restricted when the planetary gear and the locking portion are engaged, and the first rotation is performed when the planetary gear and the locking portion are disengaged. A one-way clutch that allows relative rotation of a member and a second rotating member, wherein the first rotating member is a first concave portion provided around the axis, and the second rotating member is a portion of the first concave portion. and a first convex portion that engages with the inner peripheral surface, and the second external gear and the first convex portion are molded by the same mold portion of the mold when molding the second rotary member. , when the first rotating member and the second rotating member are engaged, the first rotating member and the It is characterized in that the coaxial position of the second rotating member is determined.

According to the present invention, it is possible to realize a one-way clutch that can reduce the occurrence of vibration and noise.

1 is an exploded view of a one-way clutch according to an embodiment; (a) A schematic diagram showing a disengaged state of the one-way clutch according to the embodiment, (b) A schematic diagram showing a connected state of the one-way clutch according to the embodiment. (a) An exploded perspective view showing how the outer member and the inner member are positioned according to the embodiment from the outer member side, (b) showing how the outer member and the inner member are positioned according to the embodiment from the inner member side. Disassembled perspective view Schematic cross-sectional view showing the configuration of the mold for the inner member according to the example. Schematic diagram showing a configuration example of an internal gear type one-way clutch. Sectional view of an image forming apparatus having a one-way clutch according to an embodiment FIG. 2 is a schematic diagram showing a sheet conveying section of an image forming apparatus including a one-way clutch according to an embodiment;

EMBODIMENT OF THE INVENTION Hereafter, the form for implementing this invention is demonstrated, referring drawings. First, the basic configuration of the internal gear type one-way clutch will be described.

A one-way clutch 100 shown in FIG. 5 includes an outer member 110 having an internal gear 114 , an inner member 120 rotatable relative to the outer member 110 , and planetary gears 130 meshing with the internal gear 114 . The inner member 120 is arranged inside the cylindrical outer member 110 , and the planetary gear 130 is housed in a recess 126 provided in the inner member 120 . The inner member 120 also has locking edges 127 that are engageable with the teeth of the planetary gear 130 .

As will be described below, the one-way clutch 100 connects an outer member 110 and an inner member 120, which are coaxial rotating members, while allowing relative rotation in a specific direction. Hereinafter, the rotation direction of the outer member 110 with respect to the inner member 120 will be referred to as "first direction R1" or "second direction R2."

However, "the direction of rotation of the outer member 110 with respect to the inner member 120" refers to the direction of relative rotation of the inner member 120 and the outer member 110 with the inner member 120 as a reference. Therefore, the case where the outer member 110 rotates with respect to the inner member 120 includes the case where the inner member 120 is rotating and the outer member 110 is stopped, and the case where both are rotating at different angular velocities. The first direction R1 is the clockwise direction in FIG. 5, and the second direction R2 is the direction of rotation opposite to the first direction R1, that is, the counterclockwise direction in FIG.

When outer member 110 is about to rotate in first direction R1 with respect to inner member 120, one-way clutch 100 is engaged. That is, the planetary gear 130 engages with the locking edge 127 (broken line position) as the internal gear 114 rotates in the first direction R1, and the rotation of the planetary gear 130 stops. Restricting the rotation of planetary gear 130 fixes the relative position between locking edge 127 and the teeth of internal gear 114 meshing with planetary gear 130 . That is, the outer member 110 is restricted from rotating relative to the inner member 120 in the first direction R1.

When outer member 110 rotates in second direction R2 with respect to inner member 120, one-way clutch 100 is disengaged. That is, the planetary gear 130 rotates along with the internal gear 114 rotating in the second direction R2 at a position separated from the locking edge 127 (solid line position). This allows the internal gear 114 to rotate with respect to the locking edge 127, allowing the outer member 110 to rotate relative to the inner member 120 in the second direction R2.

<Example>
First, a one-way clutch according to a first embodiment (embodiment) will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is an exploded view of the one-way clutch 1. FIG. 2(a) and 2(b) are schematic diagrams showing the state inside the clutch in the disengaged state and the connected state, respectively.

As shown in FIG. 1, the one-way clutch 1 includes an outer member 10, an inner member 20, and planetary gears 30. As shown in FIG. The outer member 10 is the first rotating member of this embodiment, and the inner member 20 is the second rotating member of this embodiment.

The outer member 10 and the inner member 20 are arranged coaxially, that is, on a common axis X1. Hereinafter, unless otherwise specified, the direction of the axis X1 will be referred to as the "axial direction". In addition, when viewed from the axial direction, the direction along a straight line passing through the axis X1 is defined as a "radial direction", and the direction along an arc centered on the axis X1 is defined as a "rotational direction".

The outer member 10 and the inner member 20 constitute a clutch case containing the main components of the one-way clutch 1, and are engaged so as to be relatively rotatable about the axis X1 in a configuration described later.

The planetary gear 30 has teeth 31 meshing with the internal gear 14 (see FIGS. 2(a) and 2(b)) of the outer member 10 and is accommodated between the side walls 11, 21 of the outer member 10 and the inner member 20. . The planetary gear 30 has a boss portion 33 that protrudes in the axial direction, and the boss portion 33 is fitted into an elongated hole 22 formed in the side wall 21 of the inner member 20 . The elongated hole 22 extends in the circumferential direction about the axis X1, and holds the planetary gear 30 in a state in which it can rotate about a rotation axis X2 parallel to the axis X1 and can revolve about the axis X1. . The long hole 22 is the opening of this embodiment. The opening is not limited to a through hole, and may be a groove having a depth that allows the boss portion 33 to be fitted therein.

The inner member 20 is provided with a locking edge 27 that can be engaged with the planetary gear 30 as shown in FIG. The inner member 20 has a convex portion 28 that protrudes axially from the side wall 21 and radially from the boss 23 , and the locking edge 27 is provided at the radially outer end of the convex portion 28 . The planetary gear 30 is movable with respect to the inner member 20 between a position where it engages with the locking edge 27 (engaged position) and a position where it disengages from the locking edge 27 (disengaged position). The locking edge 27 is the locking part of this embodiment. The locking portion is not limited to the shape of the locking edge 27 shown in the figure, and may be of any type that stops the rotation of the planetary gear 30 when engaged with the planetary gear 30 .

Next, operation of the one-way clutch 1 will be described with reference to FIG.

FIG. 2(a) shows a released state in which the connection between the outer member 10 and the inner member 20 is released. In this state, planetary gear 30 is disengaged from locking edge 27 . When the outer member 10 rotates in the second direction R2 with respect to the inner member 20, the planetary gear 30 rotates along with the rotation of the internal gear 14 while being separated from the locking edge 27, and the outer member 10 rotates along with the inner member. 20 to idle. That is, the one-way clutch 1 is configured to allow relative rotation of the outer member 10 with respect to the inner member 20 in the second direction R2.

FIG. 2(b) shows a connected state in which the outer member 10 and the inner member 20 are connected. In this state, the planetary gear 30 is engaged with the locking edge 27 to stop rotating, and the outer member 10 and the inner member 20 are connected via the planetary gear 30 . That is, the one-way clutch 1 is configured to restrict relative rotation of the outer member 10 with respect to the inner member 20 in the first direction R1.

Next, the positioning structure between the outer member 10 and the inner member 20 will be described with reference to FIG. FIG. 3 is a schematic diagram showing how the outer member and the inner member are positioned. 3A is an exploded perspective view seen from the outer member 10 side, and FIG. 3B is an exploded perspective view seen from the inner member 20 side.

The outer member 10 has two positioning shapes for radial positioning with the inner member 20 . One is an outer member side cylindrical shape 13 which is a second recess provided on the opposite side of the axial direction inner member 20 from the side wall 11, and the other is provided on the axial direction inner 20 member side of the internal gear 14. It is the outer member side cylindrical surface 19 which is the first concave portion.

The inner member 20 has two positioning shapes for positioning with the outer member 10 . One is an inner member side cylindrical surface 29 which is a first convex portion formed of a plurality of curved surfaces having a smaller diameter than the tooth crest of the external gear 25 which is a second external gear, and the other is an inner member side cylindrical surface 29 which extends from the side wall 21 to the outer member 10 side shaft. It is an inner member side boss 23 that is a second convex portion extending in the direction. In this embodiment, when the diameter of the inner member side cylindrical surface 29 is larger than the root circle of the external gear 25 and smaller than the addendum circle, the inner member side cylindrical surface 29 is formed as shown in FIG. It is a compound cylindrical surface composed of a plurality of curved surfaces as many as the number of teeth of the gear 25 .

In positioning the outer member 10 and the inner member 20, the outer member side cylindrical shape 13 and the inner member 20 side boss 23, as well as the inner peripheral surface of the outer member side cylindrical surface 19 and the outer peripheral surface of the inner member side cylindrical surface 29 are aligned. They are configured to be fitted to each other. By fitting these two portions together, the outer member 10 and the inner member 20 are engaged so as to be relatively rotatable about the axis X1.

Next, the positioning shape of the inner member 20 will be described with reference to FIG. FIG. 4 is a schematic cross-sectional view showing the molding side configuration of the inner member 20. As shown in FIG.

As described above, the inner member 20 has two positioning shapes (the inner member side cylindrical surface 29 and the inner member side boss 23 ) for radial positioning with the outer member 10 .

The inner member 10 is molded by an inner member mold 40 , and the inner member mold 40 is composed of a second mold portion (cavity portion) 41 and a first mold portion (core portion) 42 .

In the inner member molding die 40 , the external gear 25 and the two positioning shapes are designed to be formed by the same mold portion of the inner member molding die 40 . In this embodiment, considering the shape of the inner member 10 as a whole, the external gear 25 and these two positioning shapes are formed by the core portion 42 . However, it may be formed by the cavity portion 41 .

However, the external gear 25 in the inner member 10 and the positioning shapes thereof are different from each other in the mold 40 for the inner member (for example, the external gear 25 in the cavity portion 41 and the two positioning shapes in the core portion 42). If it is a formed shape, it will be generated by scraping due to wear or the like. In addition, the relative positional accuracy of the relative positional relationship between the external gear 25 and the positioning shapes at these two locations deteriorates due to play in the alignment portion between the cavity portion 41 and the core portion 42 .

Therefore, the outer gear 25 of the inner member 10 and the two positioning shapes are formed by the same mold portion of the inner member molding die 40 along the entire circumference in the rotational direction, so that the coaxial accuracy of the inner member 10 with respect to the outer member 20 is high. Accuracy can be achieved. As a result, it is possible to improve the meshing error of the inner member side gear with respect to the outer member side external gear/inner gear, and to reduce torque fluctuation, vibration, and noise.

<First modification>
In the above-described embodiment, the diameter of the inner member side cylindrical surface 29 is larger than the root circle of the external gear 25 and equal to or smaller than the addendum circle of the external gear 25. As shown in FIG. A system that is a compound cylindrical surface composed of a plurality of curved surfaces as many as the number of teeth of the gear 25 has been described.

As a first modification, the outer diameter of the cylindrical surface 29 on the inner member side may be equal to or less than the diameter of the bottom of the external gear 25 . In this case, the inner member side cylindrical surface 29 becomes a single cylindrical surface. In this embodiment as well, the external gear 25 of the inner member 10 and the two positioning shapes can be formed by the same mold portion of the inner member molding die 40 along the entire circumference in the rotational direction. It is possible to realize high coaxial precision.

<Second modification>
As a second modification, the outer diameter of the inner member side cylindrical surface 29 may be the same diameter as the tip of the external gear 25 . In this case as well, the inner member side cylindrical surface 29 is a compound cylindrical surface composed of a plurality of curved surfaces having the same number of teeth as the external gear 25 . In this embodiment as well, the external gear 25 of the inner member 10 and the two positioning shapes can be formed by the same mold portion of the inner member molding die 40 along the entire circumference in the rotational direction. High coaxial accuracy can be achieved.

<Example of application to image forming apparatus>
As an example of the drive transmission device including the one-way clutch 1 described in the above embodiment, a device for transmitting power of a motor to roller members for conveying sheets inside an image forming apparatus will be described. An image forming apparatus generally refers to a device such as a printer, a copying machine, a multifunction machine, or the like, which conveys a sheet as a recording medium and forms an image on the sheet.

An image forming apparatus 200 shown in FIG. 6 is an electrophotographic full-color laser printer that forms an image on a sheet P that is a recording medium. As the sheet P, paper such as plain paper and envelopes, glossy paper, plastic film such as overhead projector sheets, and cloth can be used. An apparatus main body 201 of the image forming apparatus 200 includes four image forming units PY, PM, PC, and PK for forming yellow, magenta, cyan, and black toner images, and an image forming engine 210 having an intermediate transfer belt 221. is accommodated. The image forming units PY to PK have a photosensitive drum 211 as an image bearing member, and form a toner image on the photosensitive drum 211 . The toner image carried on the photosensitive drum 211 is transferred onto the sheet P via an intermediate transfer belt 221, which is an intermediate transfer member.

Since the image forming units PY to PK are configured in the same manner except that the color of the toner used for development is different, the image forming unit configuration and toner image forming process (image forming operation) will be described using the image forming unit PY for yellow as an example. will be explained. In addition to the photosensitive drum 211, the image forming unit PY has a charging roller 212 as charging means, an exposure device 213Y as exposure means, a developing device 214 as developing means, and a drum cleaner. The photosensitive drum 211 is a drum-shaped photosensitive member having a photosensitive layer on its outer peripheral portion, and rotates along the rotation direction R1 of the intermediate transfer belt 221 . The charging roller 212 uniformly charges the surface of the photosensitive drum 211, and the exposure device 213Y irradiates the photosensitive drum 211 with a laser beam modulated according to image information to form an electrostatic latent image on the surface of the photosensitive drum 211. image writing operation is performed. The developing device 214 accommodates a developer containing toner, and supplies toner to the photosensitive drum 211 to develop the electrostatic latent image into a toner image. The toner image formed on the photosensitive drum 211 is primarily transferred onto the intermediate transfer belt 221 by a primary transfer roller 225 which is a primary transfer device. Residual toner remaining on the photosensitive drum 211 after transfer is removed by a drum cleaner.

The intermediate transfer belt 221 is wound around a secondary transfer inner roller 222, a tension roller 223, a tension roller 224, and a primary transfer roller 225, and rotated counterclockwise in the drawing. The image forming operation described above is carried out in parallel in each of the image forming units PY to PK, and a full-color toner image is formed on the intermediate transfer belt 221 by multiple-transferring four-color toner images so as to overlap each other. . This toner image is borne on the intermediate transfer belt 221 and conveyed to a transfer portion (secondary transfer portion) configured as a nip portion between the secondary transfer roller 243 and the secondary transfer inner roller 222 . The toner image carried on the intermediate transfer belt 221 is secondarily transferred onto the sheet P when a bias voltage having a polarity opposite to the charging polarity of the toner is applied to the secondary transfer roller 243 as transfer means. Residual toner remaining on the intermediate transfer belt 221 after transfer is removed by a belt cleaner 226 .

The sheet P to which the toner image has been transferred is delivered to the fixing device 250 . The fixing device 250 has a pair of fixing rollers 251 for nipping and conveying the sheet P and a heat source such as a halogen lamp, and applies pressure and heat to the toner image carried on the sheet P. FIG. As a result, the toner particles are melted and fixed, and a fixed image fixed on the sheet P is obtained.

Next, the operation of conveying the sheet P by the image forming apparatus 200 will be described. The feeding cassettes 231 and 232 accommodate the sheets P and are detachably attached to the apparatus main body 201 . Sheets P stored in the feeding cassettes 231 and 232 are fed one by one by the feeding unit 240 . The feeding unit 240 includes a pickup roller 40a that feeds the sheet P from the feeding cassettes 231 and 232, and a feeding roller 40b that receives and conveys the sheet P from the pickup roller 40a. The feeding unit 240 also includes a separating roller 40c that separates the sheet P conveyed by the feeding roller 40b from other sheets P. As shown in FIG. Note that the feeding unit 240 is an example of a feeding unit that feeds the sheet P, and is a feeding unit of a belt system that conveys the sheet P by attracting it to a belt member with a suction fan, or a friction separation system that uses a pad. may be used. A user can directly set a sheet P on a manual feed tray 233 provided on the side of the apparatus main body 201, and the sheet P set on the manual feed tray 233 is fed by a feeding unit.

A sheet P sent out from the feeding unit 240 is conveyed to a registration roller pair (hereinafter referred to as a registration roller pair) 242 via a pre-registration roller pair (hereinafter referred to as a pre-registration roller pair) 241 . The pair of registration rollers 242, which is an example of registration means, corrects the skew of the sheet P by coming into contact with the leading edge of the sheet P, that is, the downstream end in the sheet conveying direction. After that, the registration roller pair 242 feeds the sheet P to the secondary transfer portion at a timing that matches the progress of the image forming operations of the image forming portions PY to PK. The sheet P on which the toner image has been transferred in the secondary transfer portion and the image has been fixed by the fixing device 250 is delivered to the sheet discharge portion 260, and after the fixing, the transfer path of the sheet P can be switched by the roller pair 261. It is conveyed towards member 264 .

When the image formation on the sheet P is completed, the sheet P with the image formed on the first side (front side) is discharged to the discharge tray 280 by the discharge roller pair 262 . When an image is to be formed on the second surface (back surface) of the sheet P, the sheet P is transferred to the reverse conveying section 270 via the conveying roller pair 263 by the switching member 264 . The reversing conveying unit 270 includes a reversing roller pair 271 that reversely conveys (switches back) the sheet P, and a double-sided path 279 that guides the sheet P switched back by the reversing roller pair 271 toward the registration roller pair 242 . The reversing roller pair 271 conveys the sheet P toward the discharge space above the discharge tray 280 by a predetermined distance, and then conveys the sheet P in the opposite direction, thereby sending the sheet P to the double-sided path 279 . A plurality of conveying roller pairs (272, 273, 274) are arranged on the double-sided path 279 as will be described later in detail, and convey the sheet P toward the registration roller pair 242 again. Then, the sheet P on which the image is formed on the second side by passing through the secondary transfer portion and the fixing device 250 is discharged to the discharge tray 280 by the discharge roller pair 262 .

Note that the image forming engine 210 is an example of image forming means, and may be of a direct transfer system in which a toner image formed on a photoreceptor is directly transferred onto a sheet in a transfer unit, for example. Further, the configuration of the image forming means may be an inkjet method or an offset printing method.

As shown in FIG. 7, the image forming apparatus 200 includes a feeding path 249, an image forming path 259, and a double-sided path 279 as a sheet conveying section for feeding and conveying the sheet P. FIG. Sheet transport spaces in these paths are configured by guide members supported by the apparatus main body 201 .

A feeding path 249 is a conveying path for feeding the sheet P, and a feeding unit 240 and a pre-registration roller pair 241 are arranged. The feeding unit 240 is driven by the feeding motor M1, and the pre-registration roller pair 241 is driven by the pre-registration motor M2.

The image forming path 259 is a conveying path for forming an image while conveying the sheet P, and a registration roller pair 242, a secondary transfer roller 243, a secondary transfer inner roller 222, and a fixing roller pair 251 are arranged. The registration roller pair 242 is driven by a registration motor M3, the secondary transfer inner roller 222 is driven by an ITB (Intermediate Transfer Belt) motor M4, and the fixing roller pair 251 is driven by a fixing motor M5.

The double-sided path 279 is a conveying path for conveying the sheet P fed from the image forming path 259 again toward the image forming path 259 when performing double-sided printing. A pair 273 and a third double-sided roller pair 274 are arranged. The reversing roller pair 271 receives and reverses the sheet P from the image forming path 259 and feeds it to the double-sided path 279 . The reverse roller pair 271 can also discharge the sheet P to a discharge tray 280 above the discharge tray 280 where the discharge roller pair 262 discharges the sheet P. FIG. The first to third double-sided roller pairs 272 to 274 are arranged in this order along the direction from the reversing roller pair 271 to the registration roller pair 242 on the double-sided path 279 (hereinafter referred to as "sheet conveying direction" unless otherwise specified). be done.

The reverse roller pair 271 and the first double-sided roller pair 272 are driven by a reverse motor M7, and the second double-sided roller pair 273 and the third double-sided roller pair 274 are driven by a double-sided motor M8. Between the first pair of double-sided rollers 272 and the second pair of double-sided rollers 273 in the sheet conveying direction, a double-sided sensor 276 is arranged as detecting means capable of detecting the sheet. Further, a registration sensor 244 is arranged as another detecting means at a position near the upstream side of the registration roller pair 242 . For these sensors, for example, a photoelectric sensor capable of detecting light shielding by a sheet can be used.

The one-way clutch 1 of the above embodiment can be suitably arranged as part of a drive transmission device for transmitting driving force from the double-sided motor M8 to the second double-sided roller pair 273. As shown in FIG. Specifically, a motor gear is attached to the shaft of a double-sided motor M8, which is a drive source, and connected to the external gear 25 of the inner member of the one-way clutch of this configuration via a pulley. After that, it is connected to the gear mounted on the shaft of the second pair of double-sided rollers via the external gear 15 of the outer member. This makes it possible to have a one-way function for the second pair of double-sided rollers.

The above configuration is one application example of the one-way clutch 1 in the image forming apparatus, and can be applied to other parts of the image forming apparatus. For example, the one-way clutch 1 can be arranged between the feeding motor M1 and the pickup roller 40a and the feeding roller 40b of the feeding unit 240 (see FIGS. 6 and 7). As a result, for example, even if the driving of the feeding motor M1 is stopped after the sheet reaches the downstream roller pair (for example, the pre-registration roller pair 241) from the feeding roller 40b, the one-way clutch 1 is slipped to continue feeding the sheet. It is possible to Alternatively, it may be arranged as part of a transmission device that transmits driving force from the reversing motor M7 to the first double-sided conveying roller 272. FIG.

In addition, the image forming apparatus includes an apparatus main body including an image forming means, a sheet processing apparatus for performing processes such as binding on sheets on which images have been formed, and an image reading apparatus for reading an image of an original document while conveying the sheet to be an original document. may be attached. In such accessory equipment, the one-way clutch of this embodiment may be arranged in a drive transmission path for transmitting a driving force from a drive source to a driven object such as a roller for conveying a sheet.

Furthermore, the one-way clutch according to the present disclosure can be applied as a device that couples two rotating members while allowing relative rotation in a predetermined direction in any machine including devices other than image forming devices.

1 one-way clutch 10 first rotating member (outer member)
11 outer member side wall 13 second recess (outer member side cylindrical shape)
14 internal gear 15 first external gear 19 first recess (outer member side cylindrical surface)
20 Second rotating member (inner member)
22 opening (long hole)
23 Second protrusion (inner member side boss)
25 second external gear 27 locking portion (locking edge)
29 First convex portion (inner member side cylindrical surface)
30 planetary gear X1 axis line X2 rotation axis of planetary gear 40 molding die for inner member 41 second mold portion (cavity portion) for inner member
42 First mold part (core part) of inner member

Claims (6)

a first rotating member having an internal gear on its inner circumference and a first external gear on its outer circumference;
a planetary gear meshing with the internal gear, capable of rotating on its own axis and revolving about the axis of the first rotating member;
a second rotating member having a locking portion that engages with the planetary gear to stop its rotation and a second external gear on an outer peripheral portion and that is rotatable about the axis;
with
Relative rotation of the first rotating member and the second rotating member is restricted when the planetary gear and the locking portion are engaged, and the first rotation is performed when the planetary gear and the locking portion are disengaged. A one-way clutch that allows relative rotation between a member and a second rotating member,
The first rotating member includes a first concave portion provided around the axis;
The second rotating member has a first convex portion that engages with the inner peripheral surface of the first concave portion,
When molding the second rotating member, the second external gear and the first convex portion are molded by the same mold portion of the molding die,
When the first rotating member and the second rotating member are engaged with each other, the inner peripheral surface of the first concave portion and the outer peripheral surface of the first convex portion are fitted to each other so that the first rotating member and the second rotating member are engaged. A one-way clutch characterized in that the coaxial positions of the two rotating members are positioned. 2. A one-way clutch according to claim 1, wherein the outer diameter of said first projection is smaller than the outer diameter of the tip of said second external gear of said second rotating member. 2. A one-way clutch according to claim 1, wherein the outer diameter of said first convex portion is the same diameter as the addendum of the external gear of said second rotating member. The second rotating member has a second protrusion extending axially from a side wall of the first protrusion, and the first rotating member has a second recess that engages the outer peripheral surface of the second protrusion. wherein the coaxial positions of the first rotating member and the second rotating member are positioned by fitting the outer peripheral surface of the second convex portion and the inner peripheral surface of the second concave portion. The one-way clutch according to any one of claims 1 to 3. 5. The method according to claim 4, wherein when molding the second rotating member, the second external gear, the first projection and the second projection are formed by the same mold portion of a mold. One-way clutch as described. An image forming unit that forms an image on a sheet, a sheet conveying unit that conveys the sheet toward the image forming unit, and the one-way clutch according to any one of claims 1 to 5 in the sheet conveying unit. An image forming apparatus comprising:

Images