JP2020144172A - Drive device and image forming device - Google Patents

Abstract

To provide a drive device with which it is possible to reduce a load at drive time.SOLUTION: Provided is a drive device 6, wherein an arm unit 642 of a torsion coil spring 64 includes: a first area 644 that comes in contact with a paper feed tray 10 when the paper feed tray 10 is mounted in a device body 2; a second area 646 capable of contacting a rotary shaft 622 of a pendulum gear 62 and coming in contact with the rotary shaft 622 when the paper feed tray 10 is removed from the device body 2, urging the rotary shaft 622 toward a second position side; and a third area 647 capable of contacting the rotary shaft 622 of the pendulum gear 62 and coming in contact with the rotary shaft 622 when the paper feed tray 10 is mounted in the device body 2, urging the rotary shaft 622 toward a first position side. When engaged with a driven gear 63 and driving the driven gear 63, the pendulum gear 62 swings to the first position at which the rotary shaft 622 leaves the second area 646 and the third area 647.SELECTED DRAWING: Figure 8

Description

The present invention relates to a drive device and an image forming device.

Conventionally, an image provided with a paper feed tray that supports paper and is removable from the device body, a transport device that transports the paper supported by the paper feed tray to an image forming unit, and a drive device that drives the transport device. The forming device is known. In the drive device of such an image forming apparatus, when the paper feed tray is pulled out from the main body of the device, the transmission of the driving force to the transfer device by the drive device is canceled and the paper transfer is stopped. ..

For example, the drive device disclosed in Patent Document 1 has a gear train including a plurality of gears for transmitting a driving force from a drive source to a transfer roller. The gear train consists of a drive gear to which the driving force from the drive source is input, a driven gear that rotates integrally with the transport roller that conveys the paper, and an intermediate gear that can transmit the driving force from the drive gear to the driven gear. have. The intermediate gear can move in the direction of the rotation axis, and the meshing position where the driving force is transmitted to the driven gear by engaging with the driving gear and the driven gear is released from the engagement with the driving gear and the driven gear, and the driving force is transmitted to the driven gear. It is configured so that it can be displaced to the non-engagement release position.

Further, the drive device described in Patent Document 1 includes a link member that comes into contact with the paper feed tray when the paper feed tray is mounted on the device main body, a first spring that urges the intermediate gear toward the meshing position side, and an intermediate. It has a second spring that urges the gear to the disengagement position side. Then, when the paper feed tray is mounted on the device main body, the paper feed tray and the link member come into contact with each other, the intermediate gear is displaced to the meshing position by the link member and the first spring, and the paper feed tray is removed from the device main body. The paper feed tray and the link member are separated from each other, and the intermediate gear is displaced to the disengagement position by the link member and the second spring.

Here, when the intermediate gear is displaced to the meshing position and the intermediate gear and the drive gear are engaged, the intermediate gear and the drive gear are positioned in the rotation axis direction in order to position the intermediate gear and the drive gear in the rotation axis direction. Need to be in contact with. When the intermediate gear is brought into contact with the drive gear in this way, it causes an unnecessary load when the gear train is driven.

Japanese Unexamined Patent Publication No. 2011-195319

As described above, in the drive mechanism in which the meshing of a plurality of gears can be separated from each other, the problem that an unnecessary load is generated when the gear train is driven is not only the drive device of the paper transfer device but also other devices. The same may occur in the driving device that drives the above.

Therefore, the present invention provides a drive device capable of reducing the load during drive and an image forming device including the drive device.

The drive device and the image forming device that solve the above problems have the following features.
That is, the drive device (6) of the image forming device (1) includes a device main body (2), a detachable member (10) that can be attached to and detached from the device main body (2), a gear main body (621), and the gear. A pendulum gear (62) having a rotating shaft portion (622) protruding from the main body (621) and capable of swinging in an arc shape between the first position and the second position, and the pendulum gear (62). The drive gear (61) that meshes and inputs a driving force to the pendulum gear (62) and the pendulum gear (62) mesh with the pendulum gear (62) when the pendulum gear (62) swings to the first position. The driving force is input from (62), and when the pendulum gear (62) swings to the second position, the driving force is input from the pendulum gear (62) apart from the pendulum gear (62). A torsion coil spring (64) having a driven gear (63) to be cut off, a first winding portion (641), and an arm portion (642) extending from the first winding portion (641). The arm portion (642) includes a first region (644) that comes into contact with the detachable member (10) when the detachable member (10) is attached to the apparatus main body (2), and the pendulum gear (62). The rotating shaft portion (622) can be brought into contact with the rotating shaft portion (622), and when the detachable member (10) is removed from the apparatus main body (2), the rotating shaft portion (622) is brought into contact with the rotating shaft portion (622). The second region (646) for urging the 622) toward the second position side can be brought into contact with the rotating shaft portion (622) of the pendulum gear (62), and the detachable member (10) can be brought into contact with the rotating shaft portion (622). A third region (647) that comes into contact with the rotating shaft portion (622) when mounted on the apparatus main body (2) and urges the rotating shaft portion (622) toward the first position side. When the pendulum gear (62) is engaged with the driven gear (63) to drive the driven gear (63), the rotating shaft portion (622) has the second region (646) and It swings to the first position away from the third region (647).

Further, the drive device (60) of the image forming apparatus (1) includes a device main body (2), a detachable member (10) that can be attached to and detached from the device main body (2), a gear main body (621), and the gear. A pendulum gear (62) having a rotating shaft portion (622) protruding from the main body (621) and capable of swinging in an arc shape between the first position and the second position, and the pendulum gear (62). The drive gear (61) that meshes and inputs a driving force to the pendulum gear (62) and the pendulum gear (62) mesh with the pendulum gear (62) when the pendulum gear (62) swings to the first position. The driving force is input from (62), and when the pendulum gear (62) swings to the second position, the driving force is input from the pendulum gear (62) apart from the pendulum gear (62). A first torsion coil spring (68) having a driven gear (63) to be cut off, a first winding portion (681), and a first arm portion (682) extending from the first winding portion (681). A second torsion coil spring (69) having a second arm portion (692) is provided, and the first arm portion (682) of the first torsion coil spring (68) has a detachable member (10). The first region (684) that comes into contact with the detachable member (10) when mounted on the apparatus main body (2) can be brought into contact with the rotating shaft portion (622) of the pendulum gear (62). When the detachable member (10) is removed from the apparatus main body (2), it comes into contact with the rotating shaft portion (622) and urges the rotating shaft portion (622) toward the second position side. It has two regions (686), and the second arm portion (692) of the second torsion coil spring (69) can be brought into contact with the rotating shaft portion (622) of the pendulum gear (62). When the detachable member (10) is attached to the apparatus main body (2), it comes into contact with the rotating shaft portion (622) and urges the rotating shaft portion (622) toward the first position side. The pendulum gear (62) has a third region (694), and when the driven gear (63) is driven by engaging with the driven gear (63), the rotating shaft portion (622) is said to be the same. It swings to a first position away from the second region (686) and the third region (694).

According to the present invention, it is possible to reduce the load during driving. In addition, it is possible to reduce the number of parts constituting the device.

It is a central sectional view which shows the image forming apparatus. It is an exploded perspective view which shows the drive device. It is a left side view which shows the drive device. It is a right side view which shows the drive device in the state which the rocking gear is in a 2nd position. It is a front sectional view which shows the drive device. It is a right side view which shows a torsion coil spring. It is a right side view which shows the drive device in the state which a rocking gear is in a 3rd position. It is a right side view which shows the drive device in the state which a rocking gear is in a 1st position. It is a figure which shows how the pendulum gear is pulled to the driven gear side when the driven gear is driven by the pendulum gear. It is a right side view which shows the drive device which concerns on the 2nd Embodiment in the state which the rocking gear is in a 2nd position. It is a right side view which shows the drive device which concerns on the 2nd Embodiment in the state which the rocking gear is in a 3rd position. It is a right side view which shows the drive device which concerns on 2nd Embodiment in the state which a rocking gear is in a 1st position.

Next, a mode for carrying out the present invention will be described with reference to the accompanying drawings.

[Overall configuration of image forming apparatus]
The image forming apparatus 1 shown in FIG. 1 is an embodiment of the image forming apparatus according to the present invention.
In the following description, the right side in FIG. 1 is defined as the front side of the image forming apparatus 1, the left side in FIG. 1 is defined as the rear side of the image forming apparatus 1, and the front side of the paper surface in FIG. 1 is the left side of the image forming apparatus 1, in FIG. The back side of the paper surface is defined as the right side of the image forming apparatus 1. Further, the upper side and the lower side in FIG. 1 are defined as the upper side and the lower side of the image forming apparatus 1, respectively.

The image forming apparatus 1 includes an apparatus main body 2, a feeding unit 3, an image forming unit 5, a paper ejection unit 8, a drive source 4, and a drive device 6. The paper feed unit 3 has a paper feed tray 10 and a paper transport unit 30. The apparatus main body 2 has a tray accommodating portion 2a for accommodating the paper feed tray 10. The drive device 6 drives the paper transport unit 30 by the driving force from the drive source 4.

The apparatus main body 2 is a box body formed in a substantially rectangular parallelepiped shape, and houses a paper feeding unit 3, an image forming unit 5, a drive source 4, and a drive device 6. The tray accommodating portion 2a is arranged in the lower part of the apparatus main body 2 and accommodates the paper feed tray 10 so as to be slidable in the front-rear direction. The paper feed unit 3 is arranged below the image forming apparatus 1, and conveys the paper 18 supported by the paper feed tray 10 to the image forming unit 5 by the paper conveying unit 30. The apparatus main body 2 has a paper transport path P from the paper feed unit 3 to the paper discharge unit 8 via the image forming unit 5.

The paper feed tray 10 is configured to be detachable from the device main body 2 by sliding in the front-rear direction. The paper feed tray 10 is located between a mounting position in which the paper feed tray 10 is housed in the tray accommodating portion 2a and mounted on the device main body 2 and a detaching position in which the paper feed tray 10 is pulled forward from the mounting position and removed from the device main body 2. It is possible to move with. The paper feed tray 10 is an example of a detachable member. A contact piece 10a that comes into contact with the drive device 6 when the paper feed tray 10 is in the mounting position is provided on the side portion of the paper feed tray 10 in the left-right direction.

The paper feed tray 10 has a tray main body 11, a pressure plate 12, and a push-up plate 13. The tray body 11 is formed in a box shape with an open upper surface. The pressure plate 12 is a plate-shaped member arranged on the tray main body 11 and supporting the paper 18 housed in the tray main body 11 from below.

The pressure plate 12 is configured to be displaceable between a downwardly displaced descending position and an ascending position that is above the descending position. The push-up plate 13 is arranged below the pressure plate 12 in the tray main body 11. The push-up plate 13 comes into contact with the pressure plate 12 and pushes up the pressure plate 12 from the descending position to the ascending position.

The pressure plate 12 is rotatably supported by the tray body 11 about the rotation fulcrum 12a at the rear end, and by rotating around the rotation fulcrum 12a, it is between the lowering position and the ascending position. Displace with. The push-up plate 13 is rotatably supported by the tray body 11 about the rotation fulcrum 13a at the rear end, and by rotating around the rotation fulcrum 13a, the pressure plate 12 is raised and lowered. It can be displaced from the position. The driving force from the driving source 4 is transmitted to the push-up plate 13 by the driving device 6, and the pushing-up plate 13 is driven by the transmitted driving force.

The paper transport unit 30 is a transport mechanism that separates and takes out the paper 18 supported by the paper feed tray 10 one by one and transports the paper 18 toward the image forming unit 5. The paper feed roller 31, the separation roller 32, and the separation pad. It includes 33, a pair of transport rollers 34, and a pair of resist rollers 35.

The paper feed roller 31 is a roller for feeding the paper 18 supported by the paper feed tray 10 toward the separation roller 32. The separation roller 32 is arranged downstream of the paper feed roller 31 in the transport direction of the paper 18, and the separation pad 33 is arranged so as to face the separation roller 32 and is urged toward the separation roller 32. There is. The driving force from the drive source 4 is transmitted to the paper feed roller 31 and the separation roller 32 by the drive device 6, and the paper feed roller 31 and the separation roller 32 are driven by the transmitted driving force.

The paper 18 fed toward the separation roller 32 by the paper feed roller 31 is separated one by one between the separation roller 32 and the separation pad 33. The sheets 18 separated one by one are conveyed toward the transfer roller 34 along the transfer path P.

The transport roller 34 is a roller that applies a transport force to the paper 18, and is arranged on the downstream side of the paper 18 in the transport direction with respect to the separation roller 32 and the separation pad 33. The paper 18 conveyed from the separation roller 32 toward the transfer roller 34 is conveyed by the transfer roller 34 toward the resist roller 35 along the transfer path P.

The resist roller 35 is arranged on the downstream side of the paper 18 in the transport direction with respect to the transport roller 34. The resist roller 35 corrects the posture of the paper 18 by temporarily stopping the movement of the tip of the paper 18 to be conveyed. After that, the resist roller 35 conveys the paper 18 toward the transfer position of the image forming unit 5 at a predetermined timing.

The image forming unit 5 is arranged on the downstream side of the paper feeding unit 3 in the conveying direction, and forms an image on the paper 18 conveyed from the paper feeding unit 3.
The image forming unit 5 includes a process cartridge 50 that transfers an image to the surface of the paper 18 conveyed from the paper feeding unit 3, an exposure unit 56 that exposes the surface of the photoconductor drum 54 of the process cartridge 50, and a process cartridge 50. It is provided with a fixing unit 70 for fixing the image transferred to the paper 18.

The process cartridge 50 is arranged above the tray accommodating portion 2a in the apparatus main body 2, and includes a developer accommodating chamber 51, a supply roller 52, a developing roller 53, a photoconductor drum 54, a transfer roller 55, and the like. It has.

The exposure unit 56 includes a laser diode, a polygon mirror, a lens, a reflector, and the like, and by irradiating the photoconductor drum 54 with a laser beam based on the image data input to the image forming apparatus 1, the exposure unit 56 is provided. The surface of the photoconductor drum 54 is exposed.

Toner serving as a developer is stored in the developer storage chamber 51. The toner stored in the developer storage chamber 51 is sent to the supply roller 52 while being stirred by a stirring member (not shown). The supply roller 52 further supplies the toner sent from the developer accommodating chamber 51 to the developing roller 53.

The developing roller 53 is arranged in close contact with the supply roller 52, and carries toner supplied from the supply roller 52 and positively charged by a sliding contact member (not shown). Further, a positive development bias is applied to the developing roller 53 by a bias applying means (not shown).

The photoconductor drum 54 is arranged adjacent to the developing roller 53. The surface of the photoconductor drum 54 is uniformly positively charged by a charger (not shown) and then exposed by the exposure unit 56. The exposed portion of the photoconductor drum 54 has a lower potential than the other portions, and an electrostatic latent image based on the image data is formed on the photoconductor drum 54.
Then, a positively charged toner is supplied from the developing roller 53 to the surface of the photoconductor drum 54 on which the electrostatic latent image is formed, so that the electrostatic latent image is visualized and becomes a developer image. ..

The transfer roller 55 is arranged to face the photoconductor drum 54, and a negative transfer bias is applied by a bias applying means (not shown). With the transfer bias applied to the surface of the transfer roller 55, the paper 18 is conveyed between the photoconductor drum 54 on which the developer image is formed and the transfer roller 55 (transfer position) without sandwiching the paper 18. The developer image formed on the surface of the photoconductor drum 54 is transferred to the surface of the paper 18.

The fixing unit 70 includes a heating roller 71 and a pressing roller 72. The heating roller 71 is rotationally driven by a driving force from the drive source 4, and the heating roller 71 is heated by supplying electric power from a power source (not shown). The pressing roller 72 is arranged to face the heating roller 71, and is brought into close contact with the heating roller 71 to rotate in a driven manner. When the paper 18 on which the developer image is transferred is conveyed to the fixing unit 70, the paper 18 is conveyed while being sandwiched between the heating roller 71 and the pressing roller 72, and the developer image is fixed on the paper 18.

The paper ejection unit 8 is arranged on the downstream side of the image forming unit 5 in the transport direction of the paper 18, and ejects the paper 18 on which the image is formed by the image forming unit 5 to the outside of the apparatus main body 2. The paper ejection unit 8 includes a pair of paper ejection rollers 81 and a paper ejection tray 82. The paper ejection roller 81 ejects the paper 18 conveyed from the fixing unit 70 toward the outside of the apparatus main body 2. The paper ejection tray 82 is formed on the upper surface of the apparatus main body 2, and the paper ejecting tray 82 supports the paper 18 ejected to the outside of the apparatus main body 2 by the paper ejection roller 81.

[First Embodiment of Drive Device]
Next, the drive device 6 according to the first embodiment will be described.
The drive device 6 is configured so that the drive force from the drive source 4 is input and the input drive force can be output to the paper feed roller 31 or the like of the paper transport unit 30.

As shown in FIGS. 2 to 5, the drive device 6 includes a drive gear 61, a pendulum gear 62, a driven gear 63, a torsion coil spring 64, and a gear cover 65. The device main body 2 has a support frame 21 arranged at one side end in the left-right direction in the device main body 2 and extending in the front-rear direction and the up-down direction, and the drive device 6 is supported by the support frame 21. .. In the present embodiment, the support frame 21 is arranged at the left end portion in the apparatus main body 2.

The drive gear 61 is supported by the support frame 21, and is a gear to which the driving force from the drive source 4 is input. The drive gear 61 is configured to be rotatable in the forward rotation direction and the reverse rotation direction by inputting a driving force from the drive source 4. The drive gear 61 meshes with the pendulum gear 62 and inputs a driving force to the pendulum gear 62.

The pendulum gear 62 is supported by the support frame 21, and is configured to swing in an arc shape between the first position (position shown in FIG. 8) and the second position (position shown in FIG. 4). The pendulum gear 62 has a gear body 621 and a rotating shaft portion 622 protruding from the side surface 621a of the gear body 621 on the gear cover 65 side and the side surface 621b on the support frame 21 side. The axis center of the rotating shaft portion 622 is the rotating shaft center C1 of the pendulum gear 62.

The driven gear 63 is supported by the support frame 21, engages with the pendulum gear 62 when the pendulum gear 62 swings to the first position, and separates from the pendulum gear 62 when the pendulum gear 62 swings to the second position. It is configured to do. When the driven gear 63 meshes with the pendulum gear 62, a driving force is input from the pendulum gear 62 to the driven gear 63, and when the driven gear 63 is separated from the pendulum gear 62, the driving force from the pendulum gear 62 to the driven gear 63 Input is blocked. The driven gear 63 is connected to the paper feed roller 31, and the driving force transmitted to the driven gear 63 is output to the paper feed roller 31.

The gear cover 65 is arranged in the left-right direction so as to face the support frame 21 on the side opposite to the support frame 21 side with the drive gear 61, the pendulum gear 62, and the driven gear 63 interposed therebetween. In the present embodiment, the gear cover 64 is arranged on the left and right outside of the support frame 21, and the drive gear 61 and the pendulum gear 62 are covered from the left and right outside by the gear cover 65.

The gear cover 65 has one side surface 65a on the left and right inner sides, and has another side surface 65b on the left and right outer sides opposite to the one side surface 65a. One side surface 65a of the gear cover 65 faces the drive gear 61 and the pendulum gear 62. The gear cover 65 supports the drive gear 61 and the pendulum gear 62 on one side surface 65a.

The gear cover 65 has a support hole 651. The support hole 651 penetrates the gear cover 65 in the rotation axis C1 direction, and is formed in an elongated hole shape extending along the circumferential direction of the drive gear 61. The rotating shaft portion 622 of the pendulum gear 62 is slidably inserted into the support hole 651. By sliding the rotating shaft portion 622 in the support hole 651, the pendulum gear 62 can swing between the first position and the second position. Further, the pendulum gear 62 is supported on one side surface 65a of the gear cover 65 by inserting the rotating shaft portion 622 into the support hole 651.

As shown in FIGS. 2 to 6, the torsion coil spring 64 is an urging member that presses the pendulum gear 62 in the swing direction, and is composed of an elastic linear member. The torsion coil spring 64 includes a first winding portion 641, an urging arm portion 642 extending from the first winding portion 641 in one direction, and a engaging arm portion 642 extending from the first winding portion 641 in a direction different from the one direction. It has a stop arm portion 643. The urging arm portion 642 is an example of an arm portion extending from the first winding portion.

The first winding portion 641 is formed by spirally winding a linear member around a first axis center C2 parallel to the rotation axis C1. The torsion coil spring 64 is arranged between the support frame 21 and the gear cover 65, and the first winding portion 641 is supported by the support portion 211 formed on the support frame 21.

The urging arm portion 642 extends in one direction orthogonal to the axis center C2. In the present embodiment, the urging arm portion 642 extends downward from the first winding portion 641. The locking arm portion 643 extends in another direction orthogonal to the axis center C2. In the present embodiment, the locking arm portion 643 extends rearward from the first winding portion 641. The locking arm portion 643 is locked to the locking portion 212 formed on the support frame 21.

At the tip of the urging arm portion 642, which is the end opposite to the first winding portion 641 side, the contact piece 10a of the paper feed tray 10 when the paper feed tray 10 is mounted on the apparatus main body 2. A first region 644 is provided that comes into contact with.

When the paper feed tray 10 is attached to the apparatus main body 2 and the contact piece 10a comes into contact with the first region 644, the urging arm portion 642 is pushed backward by the contact piece 10a and displaced to the rear position ( Position shown in FIG. 7). In a state where the urging arm portion 642 is displaced to the rear position, the torsion coil spring 64 has an urging force in the direction in which the urging arm portion 642 is displaced forward. When the paper feed tray 10 is removed from the apparatus main body 2 and the contact piece 10a is separated from the first region 644, the urging arm portion 642 is displaced to the front position in front of the rear position by the urging force of the torsion coil spring 64. (Position shown in FIG. 4).

A second winding portion 645 is provided in the middle of the urging arm portion 642 between the first winding portion 641 and the first region 644. The second winding portion 645 is formed by spirally winding a linear member around a second axis center C3 parallel to the rotation axis C1. The number of turns of the linear member in the second winding portion 645 is formed to be smaller than the number of windings of the linear member in the first winding portion 641.

The rotating shaft portion 622 of the pendulum gear 62 penetrates through the second winding portion 645. The rotating shaft portion 622 penetrates the second winding portion 645 with a gap G in a direction orthogonal to the rotation axis C1 direction of the rotating shaft portion 622.

The second winding portion 645 of the urging arm portion 642 has a second region 646 and a third region 647. The second region 646 can come into contact with the rotating shaft portion 622 of the pendulum gear 62, and when the paper feed tray 10 is removed from the device main body 2 and moves to the detached position, the second region 646 comes into contact with the rotating shaft portion 622 and the rotating shaft. This is an area for urging the portion 622 toward the second position side. The third region 647 can come into contact with the rotating shaft portion 622 of the pendulum gear 62, and when the paper feed tray 10 is mounted on the apparatus main body 2 and moves to the mounting position, the third region 647 comes into contact with the rotating shaft portion 622 and the rotating shaft. This is an area for urging the portion 622 toward the first position side.

The second region 646 and the third region 647 of the urging arm portion 642 are arranged on the inner peripheral surface of the second winding portion 645. The second region 646 is located at the rear of the second winding portion 645, the third region 647 is located at the front of the second winding portion 645, and the second region 646 is located behind the third region 647. Have been placed.

In the drive device 6 configured in this way, as shown in FIG. 4, the paper feed tray 10 is removed from the device main body 2 and moved to the detached position, and the contact piece 10a is the first region of the urging arm portion 642. When separated from 644, the urging arm portion 642 is displaced to the front position. When the urging arm portion 642 is displaced to the front position, the second region 646 comes into contact with the rotating shaft portion 622 and urges the rotating shaft portion 622 toward the second position side. The pendulum gear 62 whose rotating shaft portion 622 is urged by the second region 646 swings to the second position. When the pendulum gear 62 is in the second position, the rotating shaft portion 622 of the pendulum gear 62 and the second region 646 of the urging arm portion 642 are in contact with each other.

When the pendulum gear 62 swings to the second position, the driven gear 63 is separated from the pendulum gear 62, and the input of the driving force from the pendulum gear 62 to the driven gear 63 is cut off. As a result, when the paper feed tray 10 is removed from the device main body 2, the driving force is not input to the paper feed roller 61, and the drive of the paper feed roller 61 is stopped.

On the other hand, when the paper feed tray 10 is mounted on the apparatus main body 2 and moves to the mounting position, and the contact piece 10a comes into contact with the first region 644 of the urging arm portion 642, the urging arm portion 642 is displaced to the rear position. To do. When the urging arm portion 642 is displaced to the rear position, the third region 647 comes into contact with the rotating shaft portion 622 and urges the rotating shaft portion 622 toward the first position side.

The pendulum gear 62 whose rotating shaft portion 622 is urged by the third region 647 swings to the third position. As shown in FIG. 7, the third position is a position between the first position and the second position, at a position where the tooth tip 62a of the pendulum gear 62 and the tooth tip 63a of the driven gear 63 can be engaged with each other. is there. When the pendulum gear 62 is in the third position, the rotating shaft portion 622 of the pendulum gear 62 and the third region 647 of the urging arm portion 642 are in contact with each other.

In this way, when the pendulum gear 62 is rotated to the third position by the driving force from the drive gear 61, the tooth tips 62a of the pendulum gear 62 and the tooth tips 63a of the driven gear 63 come together. Engage. When the pendulum gear 62 rotates while the tooth tips 62a of the pendulum gear 62 and the tooth tips 63a of the driven gear 63 are engaged, the pendulum gear 62 is pulled in a direction approaching the driven gear 63, and as shown in FIG. The driven gear 63 is driven by swinging to the first position where the gear 62 and the driven gear 63 are completely engaged with each other. When the pendulum gear 62 swings from the third position to the first position, the rotating shaft portion 622 moves from the state of being in contact with the third region 647 of the second winding portion 645 toward the second region 646 side, and the second Separated from the three regions 647.

Here, as shown in FIG. 9A, the pendulum gear 62 has a pitch circle radius Rp and a tooth tip circle radius Rt, and the distance from the pitch circle Cp to the tooth tip 62a in the radial direction of the pendulum gear 62. D is a value obtained by subtracting the pitch circle radius Rp from the tooth tip circle radius Rt (D = Rt−Rp). The pendulum gear 62 is configured to move to the driven gear 63 side by a distance D when swinging from the third position to the first position.

When the pendulum gear 62 is in the third position, the rotating shaft portion 622 is in contact with the third region 647 with a gap G between it and the second region 646 of the second winding portion 645. In this case, the gap G is a value obtained by subtracting the outer diameter of the rotating shaft portion 622 from the inner peripheral diameter of the second winding portion 645. Further, the gap G between the rotating shaft portion 622 and the second winding portion 645 is formed to be larger than the distance D from the pitch circle Cp in the radial direction of the pendulum gear 62 to the tooth tip 62a.

Therefore, as shown in FIG. 9B, when the pendulum gear 62 swings from the third position to the first position, the rotation shaft portion 622 moves toward the second region 646 side, but the second The rotating shaft portion 622 is held in a state separated from the second region 646 without reaching the region 646. That is, in the pendulum gear 62, when the driven gear 63 is driven by engaging with the driven gear 63, the rotating shaft portion 622 is separated from the second region 646 and the third region 647 of the second winding portion 645. It is configured to swing to a position.

When the pendulum gear 62 swings from the third position to the first position, the urging arm portion 642 is maintained in a state where the first region 644 and the contact piece 10a are in contact with each other. Part 645 does not move.

In this way, when the drive device 6 is driven in a state where the paper feed tray 10 is mounted on the device body 2 and the third region 647 of the urging arm portion 642 is in contact with the rotation shaft portion 622, the pendulum gear 62 The tooth is pulled into the tooth of the driven gear 63, and the pendulum gear 62 swings by a distance D from the pitch circle Cp in the radial direction to the tooth tip 62a. However, since the gap G between the rotating shaft portion 622 and the second winding portion 645 is formed to be larger than the distance D, the rotating shaft portion 622 comes into contact with the inner peripheral surface of the second winding portion 645. There is no.

Further, the second region 646 and the third region 647 of the urging arm portion 642 of the torsion coil spring 64 are arranged at positions where they do not come into contact with the rotating shaft portion 622 of the pendulum gear 62 when the driven gear 63 is driven by the pendulum gear 62. ing. As a result, it is possible to reduce unnecessary loads on the drive gear 61, the pendulum gear 62, and the driven gear 63 when the drive device 6 in which the driven gear 63 is driven by the drive gear 61 via the pendulum gear 62 is driven. It has become.

Further, the torsion coil spring 64 has a first region 644 that comes into contact with the contact piece 10a of the paper feed tray 10, and has a spring member for swinging the pendulum gear 62 and a member that comes into contact with the paper feed tray 10. Since the torsion coil spring 64 is also used as the above, it is possible to reduce the number of parts constituting the drive device 6.

Further, in the torsion coil spring 64, the first region 644 of the urging arm portion 642 is arranged at a position farther from the second region 646 of the urging arm portion 642 with respect to the first winding portion 641. .. That is, the distance from the first winding portion 641 to the first region 644 is configured to be larger than the distance from the first winding portion 641 to the second region 646.

As a result, when the contact piece 10a of the paper feed tray 10 comes into contact with the first region 644, the urging arm portion 642 acts on the paper feed tray 10, and the paper feed tray 10 is pushed out from the apparatus main body 2. The power becomes smaller. As a result, the force required for mounting the paper feed tray 10 on the apparatus main body 2 can be reduced, and the operability of the paper feed tray 10 can be improved.

Further, the torsion coil spring 64 is formed so that the number of turns of the second winding portion 645 is smaller than the number of windings of the first winding portion 641. Therefore, when the contact piece 10a of the paper feed tray 10 inserted into the apparatus main body 2 comes into contact with the first region 644 and the first region 644 is pressed, the second winding portion 645 has a small number of turns and is elastic. Is small, the displacement amount of the first region 644 with respect to the second winding portion 645 is small, and the displacement amount of the second winding portion 645 can be secured to be large. As a result, the pendulum gear 62 at the second position can be easily swung to the third position where the tooth tips 62a of the pendulum gear 62 and the tooth tips 63a of the driven gear 63 can be engaged.

Further, the second region 646 and the third region 647 of the torsion coil spring 64 are provided on the inner peripheral surface of the second winding portion 645 formed by winding the linear member. The portion of the urging arm portion 642 of the torsion coil spring 64 where the second region 646 and the third region 647 are provided may be formed in a U shape, for example. However, by forming the second region 646 and the third region 647 by the second winding portion 645 formed by winding the linear member, it becomes easy to process the second region 646 and the third region 647 as a torsion coil spring 64. There is.

[Second Embodiment of Drive Device]
Next, the drive device 60 according to the second embodiment will be described. As shown in FIGS. 10 to 12, the drive device 60 according to the second embodiment has a first torsion coil spring 68 and a second torsion coil spring 69 in place of the torsion coil spring 64. It is different from the drive device 6 according to the first embodiment. Further, the drive device 60 includes a drive gear 61, a pendulum gear 62, a driven gear 63, and a gear cover 65. The gear cover 65 in the drive device 60 has a spring support portion 652, a locking portion 653, and a stopper 654. Other configurations in the drive device 60 are the same as those in the drive device 6, and will be omitted.

The first torsion coil spring 68 is an urging member capable of urging the pendulum gear 62 toward the second position side, and is composed of an elastic linear member. The first torsion coil spring 68 includes a first winding portion 681, a first arm portion 682 extending in one direction from the first winding portion 681, and a first winding portion 681 in a direction different from the one direction. It has a first locking arm portion 683 that extends. The first winding portion 681 is formed by spirally winding a linear member around the center C2 of the first axis. The first torsion coil spring 68 is arranged between the support frame 21 and the gear cover 65, and the first winding portion 681 is supported by the support portion 211 of the support frame 21.

The first arm portion 682 extends in one direction orthogonal to the center C2 of the first axis. In the present embodiment, the first arm portion 682 extends downward from the first winding portion 681. The first locking arm portion 683 extends in another direction orthogonal to the axis center C2. In the present embodiment, the first locking arm portion 683 extends rearward from the first winding portion 681. The first locking arm portion 683 is locked to the locking portion 212 of the support frame 21.

At the tip of the first arm portion 682, which is the end opposite to the first winding portion 681 side, when the paper feed tray 10 is mounted on the apparatus main body 2, the contact piece 10a of the paper feed tray 10 A first region 684 is provided that comes into contact with.

When the paper feed tray 10 is attached to the apparatus main body 2 and the contact piece 10a comes into contact with the first region 684, the first arm portion 682 is pushed backward by the contact piece 10a and displaced to the rear position ( Position shown in FIG. 11A). In the state where the first arm portion 682 is displaced to the rear position, the torsion coil spring 68 has an urging force in the direction in which the first arm portion 682 is displaced forward. When the paper feed tray 10 is removed from the apparatus main body 2 and the contact piece 10a is separated from the first region 684, the first arm portion 682 is displaced to the front position in front of the rear position by the urging force of the torsion coil spring 68. (Position shown in FIG. 10A).

A second region 686 is provided in the middle of the first arm portion 682 between the first winding portion 681 and the first region 684. The second region 686 can come into contact with the rotary shaft portion 622 of the pendulum gear 62, and when the paper feed tray 10 is removed from the device main body 2 and moves to the detached position, the second region 686 comes into contact with the rotary shaft portion 622 and the rotary shaft This is an area for urging the portion 622 toward the second position side.

The second torsion coil spring 69 is an urging member capable of urging the pendulum gear 62 toward the first position side, and is composed of an elastic linear member. The second torsion coil spring 69 includes a third winding portion 691, a second arm portion 692 extending in one direction from the third winding portion 691, and a third winding portion 691 in a direction different from the one direction. It has a second locking arm portion 693 that extends. The third winding portion 691 is formed by spirally winding a linear member around a third axis center C4 parallel to the rotation axis C1. The third winding portion 691 is supported by a spring support portion 652 provided on the other side surface 65b of the gear cover 65.

The second arm portion 692 extends in one direction orthogonal to the center C4 of the third axis. The second locking arm portion 693 extends in another direction orthogonal to the center C4 of the third axis. The second locking arm portion 693 is locked to the locking portion 653 formed on the other side surface 65b of the gear cover 65. The second arm portion 692 is provided with a third region 694. The third region 694 can come into contact with the rotating shaft portion 622 of the pendulum gear 62, and when the paper feed tray 10 is mounted on the apparatus main body 2, it comes into contact with the rotating shaft portion 622 to bring the rotating shaft portion 622 into the first position. This is the area that is urged toward the position side.

The second arm portion 692 is configured to be displaceable between a lower position (position shown in FIG. 10B) and an upper position above the lower position (position shown in FIG. 11B). .. The second arm portion 692 is displaced downward when the pendulum gear 62 is in the second position. In the state where the second arm portion 692 is displaced downward, the second torsion coil spring 69 has an urging force in the direction in which the second arm portion 692 urges the rotation shaft portion 622 toward the first position side. ing.

When the second arm portion 692 is displaced upward, it comes into contact with the stopper 654 formed on the other side surface 65b of the gear cover 65, and is restricted from being further displaced upward. When the second arm portion 692 is displaced from the lower position to the upper position, the rotation shaft portion 622 of the pendulum gear 62 at the second position is pressed toward the first position side by the third region 694, and the second arm portion 692. Displaces to the upper position, the pendulum gear 62 swings to the third position. In this way, in the second torsion coil spring 69, the third region 694 comes into contact with the rotary shaft portion 622 and urges the rotary shaft portion 622 toward the first position side, so that the pendulum gear 62 is positioned at the third position. It is configured to be able to swing.

The first torsion coil spring 68 has an urging force in the direction of swinging the pendulum gear 62 toward the second position side, and the second torsion coil spring 69 has a direction of swinging the pendulum gear 62 toward the first position side. However, the urging force of the first torsion coil spring 68 against the pendulum gear 62 is larger than the urging force of the second torsion coil spring 69 against the pendulum gear 62.

In the drive device 60 configured as described above, as shown in FIG. 10, the paper feed tray 10 is removed from the device main body 2 and moved to the detached position, and the contact piece 10a is the first torsion coil spring 68. When separated from the 1 region 684, the first arm portion 682 is displaced to the front position. When the urging arm portion 642 is displaced to the front position, the second region 686 comes into contact with the rotating shaft portion 622 and urges the rotating shaft portion 622 toward the second position side. The pendulum gear 62 whose rotating shaft portion 622 is urged by the second region 686 swings to the second position.

In this case, the pendulum gear 62 is urged to the second position side by the first torsion coil spring 68 and urged to the first position side by the second torsion coil spring 69, but the second torsion coil spring 69 Since the urging force of the first torsion coil spring 68 is larger than the urging force of the first torsion coil spring 68, the spring swings to the second position. When the pendulum gear 62 is in the second position, the rotating shaft portion 622 of the pendulum gear 62 and the second region 686 of the first arm portion 682 are in contact with each other. In the state where the pendulum gear 62 is displaced to the second position, the driven gear 63 is separated from the pendulum gear 62, and the drive of the paper feed roller 61 is stopped.

On the other hand, as shown in FIG. 11, when the paper feed tray 10 is mounted on the apparatus main body 2 and moves to the mounting position, and the contact piece 10a comes into contact with the first region 684 of the first arm portion 682, the first arm The portion 682 is displaced to the rear position. When the first arm portion 682 is displaced to the rear position, the urging force from the first torsion coil spring 68 does not act on the pendulum gear 62, and the pendulum gear 62 is on the first position side due to the urging force of the second torsion coil spring 69. Be urged to. In this case, the third region 694 of the second arm portion 692 comes into contact with the rotating shaft portion 622 of the pendulum gear 62 and urges the rotating shaft portion 622 toward the first position side. The pendulum gear 62 whose rotating shaft portion 622 is urged by the third region 694 swings to the third position.

When the pendulum gear 62 is in the third position, the rotating shaft portion 622 of the pendulum gear 62 and the third region 694 of the second arm portion 692 are in contact with each other. Further, the first arm portion 682 displaced to the rear position is located behind the rotation shaft portion 622 when the pendulum gear 62 swings to the first position, and the pendulum gear 62 is located at the first position and the third position. In the state of being in the position, it does not come into contact with the rotating shaft portion 622.

In this way, when the pendulum gear 62 is rotated to the third position by the driving force from the drive gear 61, the tooth tips 62a of the pendulum gear 62 and the tooth tips 63a of the driven gear 63 come together. Engage. As shown in FIG. 12, when the pendulum gear 62 rotates while the tooth tips 62a of the pendulum gear 62 and the tooth tips 63a of the driven gear 63 are engaged, the pendulum gear 62 is pulled in a direction approaching the driven gear 63. The driven gear 63 is driven by swinging to the first position where the pendulum gear 62 and the driven gear 63 are completely engaged with each other. When the pendulum gear 62 swings from the third position to the first position, the rotating shaft portion 622 is separated from the third region 694 of the second arm portion 692.

When the pendulum gear 62 swings from the third position to the first position, the second arm portion 692 is in contact with the stopper 654 of the gear cover 65 at the upper position, so that the pendulum gear 62 is not displaced further upward. , The rotation shaft portion 622 is separated from the third region 694 of the second arm portion 692. As a result, the pendulum gear 62 when swinging to the first position to drive the driven gear 63 is separated from the second region 686 of the first arm portion 682 and the third region 694 of the second arm portion 692. It becomes a state.

As described above, the second region 686 of the first arm portion 682 of the first torsion coil spring 68 and the third region 694 of the second arm portion 692 of the second torsion coil spring 69 are formed by the driven gear 63 by the pendulum gear 62. It is arranged at a position where it does not come into contact with the rotating shaft portion 622 of the pendulum gear 62 during driving. As a result, it is possible to reduce unnecessary loads on the drive gear 61, the pendulum gear 62, and the driven gear 63 when the drive device 60 in which the driven gear 63 is driven by the drive gear 61 via the pendulum gear 62 is driven. It has become.

Further, the first torsion coil spring 68 has a first region 684 that comes into contact with the contact piece 10a of the paper feed tray 10, and hits the spring member for swinging the pendulum gear 62 and the paper feed tray 10. Since the first torsion coil spring 68 is also used as the contacting member, it is possible to reduce the number of parts constituting the drive device 60.

[Effect in this embodiment]
In the present embodiment, the image forming apparatus 1 is configured as described above.
That is, the drive device 6 of the image forming apparatus 1 includes a device main body 2, a paper feed tray 10, a pendulum gear 62, a drive gear 61, a driven gear 63, and a torsion coil spring 64. The paper feed tray 10 is removable from the device main body 2. The pendulum gear 62 has a gear body 621 and a rotating shaft portion 622 protruding from the gear body 621, and can swing in an arc shape between the first position and the second position. The drive gear 61 meshes with the pendulum gear 62 and inputs a driving force to the pendulum gear 62. The driven gear 63 meshes with the pendulum gear 62 when the pendulum gear 62 swings to the first position, and a driving force is input from the pendulum gear 62. When the pendulum gear 62 swings to the second position, the pendulum gear 62 The input of the driving force from the pendulum gear 62 is cut off from the pendulum gear 62. The torsion coil spring 64 has a first winding portion 641 and an urging arm portion 642 extending from the first winding portion 641.

The urging arm portion 642 is capable of contacting the first region 644, which comes into contact with the paper feed tray 10 when the paper feed tray 10 is mounted on the apparatus main body 2, and the rotating shaft portion 622 of the pendulum gear 62. A second region 646 that comes into contact with the rotating shaft portion 622 and urges the rotating shaft portion 622 toward the second position side when the paper tray 10 is removed from the apparatus main body 2, and the rotating shaft portion 622 of the pendulum gear 62. When the paper feed tray 10 is mounted on the apparatus main body 2, the third region 647 comes into contact with the rotating shaft portion 622 and urges the rotating shaft portion 622 toward the first position side. Have. The pendulum gear 62 swings to a first position where the rotating shaft portion 622 is separated from the second region 646 and the third region 647 when the driven gear 63 is driven by engaging with the driven gear 63.

With such a configuration, the rotating shaft portion 622 of the pendulum gear 62 does not come into contact with the second region 646 and the third region 647 of the urging arm portion 642 when the driven gear 63 is driven by the pendulum gear 62. It is possible to reduce unnecessary loads on the drive gear 61, the pendulum gear 62, and the driven gear 63 during driving. Further, since the torsion coil spring 64 uses both the spring member for swinging the pendulum gear 62 and the member in contact with the paper feed tray 10 in the torsion coil spring 64, the number of parts constituting the drive device 6 is increased. Can be reduced.

Further, the urging arm portion 642 has a second winding portion 645 through which the rotating shaft portion 622 penetrates with a gap G in a direction orthogonal to the rotation axis C1 direction of the rotating shaft portion 622. The region 646 and the third region 647 are provided on the inner peripheral surface of the second winding portion 645.

The portion of the urging arm portion 642 where the second region 646 and the third region 647 are provided may be formed in a U shape, for example, but the second region 646 and the third region 647 are formed by the second winding portion 645. By forming it, it is easy to process it as a torsion coil spring 64.

Further, in the torsion coil spring 64, the number of turns of the second winding portion 645 is smaller than the number of turns of the first winding portion 641.

As a result, when the first region 644 of the urging arm portion 642 is pressed by the contact piece 10a of the paper feed tray 10, a large displacement amount of the second winding portion 645 can be secured, and the displacement amount of the second winding portion 645 can be secured to the second position. It becomes easy to displace a certain pendulum gear 62 to a third position where the tooth tip 62a of the pendulum gear 62 and the tooth tip 63a of the driven gear 63 can be engaged with each other.

Further, the size of the gap G obtained by subtracting the outer diameter of the rotating shaft portion 622 of the pendulum gear 62 from the inner diameter of the second winding portion 645 is from the pitch circle Cp in the radial direction of the pendulum gear 62 to the tooth tip 62a. Greater than distance D.

When the drive device 6 is driven in a state where the paper feed tray 10 is mounted on the device body 2 and the third region 647 of the urging arm portion 642 is in contact with the rotating shaft portion 622, the teeth of the pendulum gear 62 are driven. Pulled into the teeth of the gear 63, the pendulum gear 62 swings by the distance D from the pitch circle Cp in the radial direction to the tooth tip 62a. However, since the gap G between the rotating shaft portion 622 and the second winding portion 645 is formed to be larger than the distance D, the rotating shaft portion 622 comes into contact with the inner peripheral surface of the second winding portion 645. Is suppressed.

Further, in the torsion coil spring 64, the first region 644 of the urging arm portion 642 is arranged at a position farther from the second region 646 of the urging arm portion 642 with respect to the first winding portion 641. ..

As a result, when the contact piece 10a of the paper feed tray 10 comes into contact with the first region 644, the urging arm portion 642 acts on the paper feed tray 10, and the paper feed tray 10 is pushed out from the apparatus main body 2. The power becomes smaller. Therefore, the force required for mounting the paper feed tray 10 on the apparatus main body 2 can be reduced, and the operability of the paper feed tray 10 can be improved.

Further, the drive device 60 includes a device main body 2, a paper feed tray 10, a pendulum gear 62, a drive gear 61, a driven gear 63, a first torsion coil spring 68, and a second torsion coil spring 69. ing. The paper feed tray 10 is removable from the device main body 2. The pendulum gear 62 has a gear body 621 and a rotating shaft portion 622 protruding from the gear body 621, and can swing in an arc shape between the first position and the second position. The drive gear 61 meshes with the pendulum gear 62 and inputs a driving force to the pendulum gear 62. The driven gear 63 meshes with the pendulum gear 62 when the pendulum gear 62 swings to the first position, and a driving force is input from the pendulum gear 62. When the pendulum gear 62 swings to the second position, the pendulum gear 62 The input of the driving force from the pendulum gear 62 is cut off from the pendulum gear 62. The first torsion coil spring 68 has a first winding portion 681 and a first arm portion 682 extending from the first winding portion 681. The second torsion coil spring 69 has a second arm portion 692.

The first arm portion 682 of the first torsion coil spring 68 includes a first region 684 that comes into contact with the paper feed tray 10 when the paper feed tray 10 is mounted on the apparatus main body 2, and a rotating shaft portion 622 of the pendulum gear 62. It has a second region 686 that can be brought into contact with the paper feed tray 10 and comes into contact with the rotating shaft portion 622 when the paper feed tray 10 is removed from the apparatus main body 2 to urge the rotating shaft portion 622 toward the second position side. .. The second arm portion 692 of the second torsion coil spring 69 can come into contact with the rotating shaft portion 622 of the pendulum gear 62, and comes into contact with the rotating shaft portion 622 when the paper feed tray 10 is mounted on the apparatus main body 2. It has a third region 694 that biases the rotary shaft portion 622 toward the first position side. The pendulum gear 62 swings to a first position where the rotating shaft portion 622 is separated from the second region 686 and the third region 694 when the driven gear 63 is driven by engaging with the driven gear 63.

With such a configuration, when the driven gear 63 is driven by the pendulum gear 62, the second region 686 of the first arm portion 682 of the first torsion coil spring 68 and the second arm portion 692 of the second torsion coil spring 69 are second. Since the three regions 694 do not abut on the rotating shaft portion 622 of the pendulum gear 62, it is possible to reduce unnecessary loads on the drive gear 61, the pendulum gear 62, and the driven gear 63 when the drive device 60 is driven. .. Further, since the first torsion coil spring 68 also serves as a spring member for swinging the pendulum gear 62 and a member in contact with the paper feed tray 10, the number of parts constituting the drive device 60 is reduced. It is possible.

Further, the image forming apparatus 1 includes a paper feed tray that supports the paper 18, an image forming unit 5 that forms an image on the paper 18, and driving devices 6 and 60.

As a result, it is possible to reduce unnecessary loads on the drive gear 61, the pendulum gear 62, and the driven gear 63 when the image forming apparatus 1 is driven. Further, the spring member for swinging the pendulum gear 62 and the member in contact with the paper feed tray 10 can be used in combination, and the number of parts constituting the image forming apparatus 1 can be reduced.

1 Image forming device 2 Device body 4 Drive source 5 Image forming part 6, 60 Drive device 10 Feed tray 10a Abutment piece 21 Support frame 61 Drive gear 62 Pingt gear 62a Tooth tip 63 Driven gear 64 Torsion coil spring 65 Gear cover 68 1st torsion coil spring 69 2nd torsion coil spring 621 Gear body 622 Rotating shaft part 641, 681 1st winding part 642 Biasing arm part 644, 684 1st area 645 2nd winding part 646, 686 2nd area 647 , 694 3rd area 682 1st arm part 692 2nd arm part C1 Rotation axis Cp Pitch circle D Distance G Gap

Claims (7)

With the device body
A detachable member that can be attached to and detached from the device body,
A pendulum gear that has a gear body and a rotating shaft portion that protrudes from the gear body and can swing in an arc shape between the first position and the second position.
A drive gear that meshes with the pendulum gear and inputs a driving force to the pendulum gear,
When the pendulum gear swings to the first position, it engages with the pendulum gear and a driving force is input from the pendulum gear, and when the pendulum gear swings to the second position, it separates from the pendulum gear. A driven gear that blocks the input of driving force from the pendulum gear,
A torsion coil spring having a first winding portion and an arm portion extending from the first winding portion.
With
The arm portion
A first region that comes into contact with the detachable member when the detachable member is attached to the apparatus main body,
The pendulum gear can be brought into contact with the rotating shaft portion, and when the detachable member is removed from the device main body, the rotating shaft portion is brought into contact with the rotating shaft portion and the rotating shaft portion is attached toward the second position side. The second area that is gaining momentum
The pendulum gear can be brought into contact with the rotating shaft portion, and when the detachable member is attached to the apparatus main body, the rotating shaft portion is brought into contact with the rotating shaft portion and the rotating shaft portion is attached toward the first position side. It has a third area and
The pendulum gear is characterized in that when the driven gear is driven by engaging with the driven gear, the rotating shaft portion swings to the first position separated from the second region and the third region. Drive device. The arm portion has a second winding portion through which the rotating shaft portion penetrates with a gap in a direction orthogonal to the axial direction of the rotating shaft portion.
The driving device according to claim 1, wherein the second region and the third region are provided on the inner peripheral surface of the second winding portion. The driving device according to claim 2, wherein in the torsion coil spring, the number of turns of the second winding portion is smaller than the number of windings of the first winding portion. The size of the gap obtained by subtracting the outer diameter of the rotating shaft portion of the pendulum gear from the inner diameter of the second winding portion is larger than the distance from the pitch circle to the tooth tip in the radial direction of the pendulum gear. The driving device according to claim 2 or 3. The torsion coil spring is characterized in that the first region of the arm portion is arranged at a position distant from the second region of the arm portion with respect to the first winding portion. The drive device according to any one of items 1 to 4. With the device body
A detachable member that can be attached to and detached from the device body,
A pendulum gear that has a gear body and a rotating shaft portion that protrudes from the gear body and can swing in an arc shape between the first position and the second position.
A drive gear that meshes with the pendulum gear and inputs a driving force to the pendulum gear,
When the pendulum gear swings to the first position, it engages with the pendulum gear and a driving force is input from the pendulum gear, and when the pendulum gear swings to the second position, it separates from the pendulum gear. A driven gear that blocks the input of driving force from the pendulum gear,
A first torsion coil spring having a first winding portion and a first arm portion extending from the first winding portion.
A second torsion coil spring having a second arm portion and
With
The first arm portion of the first torsion coil spring is
A first region that comes into contact with the detachable member when the detachable member is attached to the apparatus main body,
The pendulum gear can be brought into contact with the rotating shaft portion, and when the detachable member is removed from the device main body, the rotating shaft portion is brought into contact with the rotating shaft portion and the rotating shaft portion is attached toward the second position side. It has a second area and
The second arm portion of the second torsion coil spring is
The pendulum gear can be brought into contact with the rotating shaft portion, and when the detachable member is attached to the apparatus main body, the rotating shaft portion is brought into contact with the rotating shaft portion and the rotating shaft portion is attached toward the first position side. It has a third area of power,
The pendulum gear is characterized in that when the driven gear is driven by engaging with the driven gear, the rotating shaft portion swings to a first position away from the second region and the third region. Drive device. An image forming apparatus including an image forming unit for forming an image on paper and a driving device.
The drive device according to any one of claims 1 to 6 is provided.
An image forming apparatus, wherein the detachable member is a paper feed tray that supports paper.

Images