JP2003269492A - Roller clutch unit and paper feeding device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller clutch unit using a coil spring as an outward member, considering that the clutch unit for transferring and releasing torque by difference in fastening force of the coil spring lacks stability as a clutch. <P>SOLUTION: The outward member is constituted of the coil spring 3. One of the hooks fixed on both ends of the coil spring 3 is used as a hook 11 for locking, and the other hook is used as a hook 12 for releasing locking. A load P<SB>1</SB>by reaction from a torque transfer member 13 is provided to the hook 11 for locking and a wedge angle α of a pocket 5 is reduced for locking a roller 4. A load P<SB>2</SB>by a control member 14 is applied to the hook 12 for releasing locking and the wedge angle α is increased for releasing the locking. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller clutch unit used in a mechanical section of office equipment and a sheet feeding apparatus using the same.

[0002]

2. Description of the Related Art In office machines such as printers and copiers,
Conventionally, a spring clutch unit as shown in FIGS. 13 and 14 is known as a clutch unit for switching the drive and inputting a driving force. The illustrated spring clutch unit includes an input shaft 52 integrated with an input gear 51.
Then, the coil spring 55 is tightly bound between the ends of the output shaft 54 integrated with the output gear 53, and the control ring 56 is fitted around the coil spring 55. The control ring 56 is provided with a cutout portion 57 (see FIG. 14) at one location, and projections 58 are provided on the outer peripheral surface thereof at regular intervals.
Hook 59 provided at one end of the coil spring 55
Is engaged with the output shaft 54, and the hook 61 provided at the other end is engaged with the cutout portion 57 of the control ring 56 from the inner peripheral side. A control member 62 driven by an actuator such as a solenoid is provided on the outer periphery of the control ring 56.

When the control member 62 is not driven (see FIG. 14 (a)), when the input shaft 52 rotates in the direction of the arrow in the drawing, the coil spring 55 is rotated and the diameter thereof is reduced, so that the input shaft 52 is rotated. 52 and the output shaft 54 are locked, and torque is transmitted to the output shaft 54. At this time, the control ring 56 rotates integrally. When the control member 62 is driven, as shown in FIG.
The control ring 56 is stopped to engage the
One end face of the coil spring 55 is engaged with the hook 61 and the coil spring 55
To expand the diameter. As a result, the binding force of the coil spring 55 is reduced and the torque transmission to the output shaft 54 is cut off.

[0004]

As described above, the conventional spring clutch unit transmits the torque by binding the coil spring 55 to the input shaft 52 and the output shaft 54, so that the coil spring 55 is in use. 55 and each axis 5
There is a possibility that the binding force of the coil spring 55 to the shafts 52 and 54 may gradually change due to changes in the lubrication state between the shafts 2 and 54 and the surface roughness and dimensions of the shafts 52 and 54. Therefore, there is a problem in that the stability of the clutch is poor and the reliability of torque transmission is low. Also, when the transmission torque becomes large, it is necessary to take measures such as increasing the number of turns of the spring and increasing the tightening margin with the shaft, which causes the clutch unit itself to become large and the rotation torque during idling to become large. There was also the inconvenience that the loss of driving force increased.

Therefore, it is an object of the present invention to provide a highly reliable roller clutch unit which solves these problems and a sheet feeding apparatus using the same.

[0006]

In order to solve the above problems, the present invention provides an inner member, an outer member rotatably fitted to the outer circumference of the inner member, and an outer circumference of the inner member. Surface and the inner peripheral surface of the outer member, the roller is housed in a pocket having a predetermined wedge angle, a control member and a torque transmitting member, and the roller locks or locks depending on the difference in the wedge angle. In a roller clutch unit that is released to transmit torque to the torque transmission member and release the torque, the outer member is constituted by a coil spring, and one of hooks provided at both ends of the coil spring is used for locking. The hook and the other are defined as lock releasing hooks, and the load due to the reaction from the torque transmitting member is applied to the lock hooks to reduce the wedge angle of the pockets and lock the rollers. And, also, it employs the configuration for releasing the lock to expand the wedge angle of the pocket by adding a load by the control member in the unlocking hooks.

In the roller clutch unit having the above structure, when a torque is applied to the inner member, the diameter of the coil spring is reduced, thereby reducing the wedge angle of the pocket and locking the roller. As a result, torque is transmitted from the inner member to the torque transmitting member via the coil spring. Further, when the control member is operated in the torque transmission state, the coil spring is expanded in diameter, the wedge angle is expanded, and the roller is unlocked. As a result, torque transmission is cut off. In this way, torque transmission / blocking is performed by changing the wedge angle of the pocket that houses the roller.
The reliability is improved as compared with the conventional spring type clutch that utilizes the binding force of the coil spring. Further, in the case of the present invention, the coil spring is used as the outer member,
The wedge angle can be changed by expanding or contracting the diameter only by applying a small load in the circumferential direction to the hooks at both ends thereof.

It is possible to employ a construction in which the wedge angle is narrowed in the rotational direction of the inner member during torque transmission. When this structure is adopted, when the inner member is rotated in the torque transmitting direction, a force is applied to the roller in the direction of moving the pocket in the expanding direction, but at the same time, the coil spring and the inner member acting on the roller act as a wedge. Since the corner is formed, the lock of the roller is not released. On the other hand, when a load is applied to the lock release hook by the action of the control member, the lock is normally released due to the expansion of the coil spring, but depending on the position of the pocket, the roller is caught in the narrow portion of the pocket. The lock may remain and the lock may not be released. However, if the wedge angle is formed as described above (that is, the direction in which the inner member narrows in the rotational direction during torque transmission), a force acts on the roller in the direction in which the pocket expands. The lock is released.

Further, the torque transmission member is positioned coaxially with the inner member, and is fitted to the outer periphery of the coil spring with a required clearance, and the torque transmission member is locked to the lock member. A configuration in which hooks are engaged can be adopted. In this case, when the inner member is rotated in the torque transmitting direction, a load in the diameter reducing direction acts on the locking hook, the wedge angle is reduced, and the roller is locked. The torque is transmitted to the torque transmission member via the coil spring. The control member rotates with the torque transmission member.
When releasing the torque transmission, the control member is stopped to stop the torque transmitting member, and a load is applied to the lock releasing hook to increase the wedge angle to release the lock.

As a more specific structure of the torque transmission member, the torque transmission member is positioned coaxially with respect to the inner member,
It is possible to adopt a configuration in which this is fitted to the outer circumference of the coil spring with a required gap and the lock hook is engaged with this.

Further, the control member may be provided in a ratchet wheel that rotates integrally with the inner member, and an actuator for engaging and disengaging the ratchet wheel may be additionally provided. In this case, the ratchet wheel is stopped or driven by controlling the actuator, and the lock is released through a control member integrated with the ratchet wheel.

Further, the following structure can be adopted as a paper feeding device using the roller clutch unit as described above.

That is, one of them is that each of a plurality of paper feed trays is provided with a paper feed roller, and a drive force transmission device including the above-mentioned roller clutch unit is provided corresponding to each paper feed roller to transmit each drive force. By selectively switching the roller clutch unit of the device, the roller clutch unit corresponding to the paper feed tray that feeds the paper is unlocked and the other paper feed tray that does not feed the paper is supported The roller clutch unit is locked so that the paper is sent out from the specified specific paper feed tray.

Secondly, a D-cut type feed roller is provided on the paper feed tray, a paper feed roller is provided in front of the paper feed tray, and the roller is provided between the feed roller and the drive source. A driving force transmission device including a clutch unit is provided, and the distance A from the tip of the paper in the paper feed tray to the paper feed roller is set to be equal to or shorter than the length A of the arc surface of the feed roller, After the delivery on the arc surface is completed, the roller clutch unit is locked and the delivery roller is temporarily stopped with the D-cut surface facing the sheet.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The roller clutch unit 1 of the first embodiment shown in FIGS. 1 and 2 includes an inner member 2, a coil spring 3 as an outer member, a plurality of rollers 4, and a torque transmission member 13 shown in a conceptual form (see FIG. 2 (a)) and the control member 14.

The inner member 2 is provided with pockets 5 at a plurality of locations (three locations in the figure) on the outer peripheral surface thereof at equal intervals. As shown in FIG. 2A, each pocket 5 has a cam surface 6 having a constant angle θ with respect to a tangent line L _{1 at a} point A on the outer peripheral surface. Further, one end of the pocket 5 is opened to one end surface of the inner member 2, but the other end is closed by the shaft portion 7.

A roller 4 is provided in each pocket 5 of the inner member 2.
The coil spring 3 is fitted with a predetermined binding force on the outer peripheral surface thereof in the state of housing. Between the inner surface of the coil spring 3 and the cam surface 6, the pocket 5 is formed in a wedge-shaped space that narrows in a certain direction. When the roller 4 in the pocket 5 is sandwiched between the inner surface of the coil spring 3 and the cam surface 6, the tangent line L _{2 at} the contact point of the roller 4
The angle α formed by the cam surface 6 and the cam surface 6 is called a wedge angle. The direction of this wedge angle α (direction toward the narrow direction) is the inner member 2
2 is formed so as to be in the rotation direction during torque transmission (see the left-hand rotation arrow in FIG. 2A).

As will be described later, since the coil spring 3 has a reduced diameter state and an enlarged diameter state, the wedge angle α in the reduced diameter state.
Becomes relatively small, and becomes relatively large in the expanded state. When the wedge angle α is small, the binding force of the coil spring 3 to the roller 4 is large, so that the roller 4 is locked, but when the wedge angle α is large, the binding force is small and the roller 4 is free.

The coil spring 3 has a coil portion 9 formed by winding a square wire densely in a right-handed manner a predetermined number of times, and both ends thereof are bent radially outward to form hooks 11 and 12. is there. The hooks 11 and 12 each have a diameter-reduced side surface 11 on which the coil portion 9 has a diameter reduction when a load is applied in the circumferential direction.
a and 12a (see FIG. 2B), and also has enlarged diameter side faces 11b and 12b to which the coil portion 9 expands when a load in the opposite direction is applied. Of these, the hook 11 for applying the load P ₁ to the reduced diameter side surface 11a during use is the locking hook 11, and the hook 12 for applying the load P ₂ to the expanded diameter side surface 12b is the unlocking hook 12. To call.
At the time of actual use, the reduced diameter side surface 1 of the locking hook 11
A torque transmission member 13 is engaged with 1a, and a control member 14 is engaged with the enlarged diameter side surface 12b of the lock releasing hook 12.

As described above, the roller clutch unit 1 of the first embodiment is characterized in that the coil spring 3 is used as its outer member. Next, the operation will be described.

When torque is transmitted from the inner member 2 to the torque transmitting member 13, the inner member 2 is rotated counterclockwise (see FIG. 2 (a)). Then, the coil spring 3 attached to the inner member 2 with a certain binding force starts to rotate, and at the same time, the load P ₁ from the torque transmission member 13 acts on the reduced diameter side surface 11a of the locking hook 11 as a reaction. The diameter of the coil spring 3 is reduced, the wedge angle α is reduced, and the roller 4 is locked. As a result, torque is transmitted from the inner member 2 to the torque transmission member 13 via the coil spring 3. At this time, the control member 14 rotates integrally with these members.

On the other hand, when the torque transmission is interrupted, the control member 14 is stopped. Then, since the load P ₂ acts on the enlarged diameter side surface 12b of the unlocking hook 12, the coil spring 3 is expanded in diameter, the wedge angle α is increased, and the lock of the roller 4 is released. As a result, torque transmission is interrupted, and the coil spring 3 and the torque transmission member 13 engaged with the coil spring 3 are stopped, while the inner member 2 idles.

When the roller 4 is unlocked, the pocket 5 located below the inner member 2 has its narrow side end portion facing downward, and the roller 4 tends to move in the narrow direction due to its own weight to be caught. There is. Therefore, it may be difficult to release the lock. However, in the case of the present invention, the direction of the wedge angle α of the pocket 5 is the same as the rotation direction of the inner member 2, and the rotation causes a force to move the roller 4 in the opposite direction, so that biting is prevented. The lock is reliably released.

In the above description, the inner member 2
Although the case where the torque is transmitted from the side to the torque transmitting member 13 side through the coil spring 3 has been described, the torque is transmitted / blocked by the same action in the opposite direction.

Next, the roller clutch unit 1 of the second embodiment shown in FIGS. 3 and 4 is a more specific embodiment of the structure of the torque transmission member 13 and the control member 14 in the first embodiment. Yes, other parts are the same.
That is, the roller clutch unit 1 in this case also includes the inner member 2, the coil spring 3 as the outer member, the plurality of rollers 4, the torque transmission member 13, and the control member 14.
The configurations of the inner member 2, the coil spring 3, and the roller 4 are the same as those described above.

The torque transmitting member 13 in this case is formed of a gear, and as shown in FIG. 3, has a shaft hole 22 and a spring accommodating portion 23 having a diameter larger than that of the shaft hole 22. It is concentrically positioned, fitted, and rotatable. Further, the spring housing portion 23 is fitted on the outer periphery of the coil spring 3 with a required gap. An engaging recess 15 is provided in the inner part of the spring housing 23 (see FIG. 4D), and the locking hook 11 is inserted into the engaging recess 15. Further, the engaging recess 1 is formed at the open end of the spring accommodating portion 23.
5, an engagement recess 16 having a width wider than that in the circumferential direction is provided, and the lock releasing hook 12 is fitted into the engagement recess 16 with a margin in the circumferential direction. The above spring accommodating portion 23 is filled with lubricating grease.

The control member 14 is provided on the inner end surface of the ratchet wheel 17 so as to project in the axial direction, and is inserted into the engagement concave portion 16. The control member 14 is engaged with the enlarged diameter side surface 12b of the unlocking hook 12 inside the engagement recess 16.
The ratchet wheel 17 is rotatably fitted to the shaft end of the inner member 2. An actuator 19 such as a solenoid and a ratchet 21 are installed on the outer peripheral portion of the ratchet wheel 17, and when the actuator 19 is driven, the ratchet 21 engages with the outer peripheral portion of the ratchet wheel 17 to stop the rotation of the ratchet wheel 17.

Roller clutch unit 1 of the second embodiment
Is as described above, and the shaft 7 of the inner member 2
Torque is transmitted to the lock hook 11 from the
Heavy P ₁Is given. This reduces the coil spring 3
The wedge angle α becomes smaller and the roller 4 becomes locked.
Then, the torque is transmitted to the torque transmission member 13. In addition,
At this time, the control member 14 is engaged with the unlocking hook 12.
The control member 14 and the ratchet wheel 1 are
7 rotates integrally with the torque transmission member 13.

When the transmission of the above-mentioned torque is cut off, the actuator 19 is driven by the signal from the control device to engage the ratchet 21 with the ratchet wheel 17 to stop the ratchet wheel 17, and the control member integrated with the ratchet wheel 17 is stopped. Stop 14 Hook 1 for unlocking at the same time when the control member 14 is stopped
Since the load P _{2 in} the radial direction acts on ₂ , the wedge angle α increases and the roller 4 is unlocked. As a result, the ratchet wheel 17, the torque transmission member 13, and the coil spring 3 are stopped, and the inner member 2 idles.

Next, in the third embodiment shown in FIGS. 5 and 6, the inner member 2 has a pocket 5 larger than that in the above case.
A roller 4 having a diameter corresponding to the size is housed in a pocket 5 of the roller. Further, in the pocket 5, one side of the roller 4 is bent into a U-shaped leaf spring 24.
Is accommodated, the roller 4 is biased in one narrow direction of the pocket 5 to form the wedge angle α. Since other configurations and operations are the same as those in the case of the above-described second embodiment, the same parts are denoted by the same reference numerals and the description thereof will be omitted.

In each of the embodiments described above,
The lock hook 11 and the lock release hook 12 of the coil spring 3 are shown as being bent linearly from the coil portion 9 in the outer diameter direction, respectively.
As shown in FIG. 7, reference numerals 1 and 12 denote reduced diameter side surfaces 11a and 12a.
It may be bent to the side. By bending in this way, when bending or transmitting torque, these bent portions are elastically deformed and have the effect of mitigating shock.

Next, in the fourth embodiment shown in FIGS. 8 and 9, the roller clutch unit 1 of each of the above-mentioned embodiments is used as a drive switching device in a paper feeding device such as a printer or a copying machine. . That is, the driving of each of the paper feed rollers 26, 26 'provided on the upper and lower two paper feed trays 25, 25' is appropriately switched to selectively select from the upper paper feed tray 25 or the lower paper feed tray 25 '. The roller clutch unit 1 according to each of the above-described embodiments is configured to be fed.
Including 1 '. The drive switching device includes a motor 27 as a drive source and a drive gear 2 fixed to a motor shaft 28 thereof.
9, driven gears 31, 3 meshing with the drive gear 29
1 ', torque transmission members 13, 13', which are gears provided coaxially with the driven gears 31, 31 ', ratchet wheels 17, 17', and torque transmission members 13, 13 '.
The roller gears 32 and 32 'are engaged with each other, and the roller gears 32 and 32' are coupled to the roller shafts 33 and 33 'of the paper feed rollers 26 and 26'.

The driven gears 31 and 31 ', the torque transmission members 13 and 13', and the ratchet wheels 17 and 17 'are provided on the shaft portions 7 and 7'of the inner members 2 and 2', respectively, and the torque thereof is provided. The coil springs 3 and 3'and the rollers 4 and 4'are incorporated into the inner diameter surfaces of the transmission members 13 and 13 'to configure the roller clutch units 1 and 1'of the above-described embodiments.

As shown in FIG. 9, when the paper 34 'is sent out from the lower paper feed tray 25', in this case, the actuator 19 of the roller clutch unit 1 is driven to the locked state, and vice versa. The other roller clutch unit 1'is unlocked.

When the drive gear 29 and the driven gears 31 and 31 'are rotated by the drive of the motor 27, the inner member 2 idles on the roller clutch unit 1 side and the torque transmission member 13, the roller gear 32, and the roller shaft 33 are rotated. Also, no torque is transmitted to the paper feed roller 26. On the other hand, on the roller clutch unit 1'side, torque is transmitted to the inner member 2 ', the coil spring 3', the torque transmission member 13 ', the roller gear 32', the roller shaft 33 ', and the paper feed roller 26'.
The paper 34 'is sent out.

On the contrary, when the roller clutch unit 1 is unlocked and the other roller clutch unit 1'is locked by the switching command from the controller,
The paper 34 in the upper paper feed tray 25 is delivered.

Next, in the fifth embodiment shown in FIGS. 10 to 12, the roller clutch unit 1 is used as a driving force transmission device for a sheet feeding device. In this case, a pair of upper and lower paper feed rollers 3 is provided in front of the paper feed tray 35.
6 and 36 'are provided, and a D-cut type feed roller 37 is provided on the paper feed tray 35. 12
As shown in (a) and (b), the arc surface 38 of the feed roller 37 comes into contact with the paper 34 in the paper feed tray 35 and feeds it forward, and feeds it between the front paper feed rollers 36 and 36 '. When the paper 34 is sandwiched between the upper and lower paper feed rollers 36 and 36 ′ and sent out forward, when the arc surface 38 of the delivery roller 37 comes into contact with the paper 34, the paper feed rollers 36,
Since the rotation of the sheet 36 'is affected, it is necessary to temporarily stop the rotation with the D-cut surface 39 facing downward while the sheet 34 passes below it, as shown in FIG. 12 (c). is there. The drive unit of the fifth embodiment has such a function.

That is, as shown in FIGS. 10 and 11, the sheet feeding device includes a motor 27 as a drive source and a motor shaft 28 thereof.
Is provided with a drive gear 29 fixed to the drive gear 29, and driven gears 31 and 31 ′ engaged with the drive gear 29. One of the driven gear 31 and the ratchet gear 17 is provided coaxially on the inner member 2 and the shaft portion 7. To be The shaft 7 is the paper feed tray 35.
The shaft 7 extends upward, and the D-cut type feed roller 37 is mounted on the shaft portion 7.

On the other hand, the intermediate gear 4 is added to the driven gear 31 '.
1 meshes with each other, and further the intermediate gear 41 has a roller gear 4
Two mesh. The paper feed roller 36 is mounted on the shaft 43 of the roller gear 42, and the other paper feed roller 36 'is mounted on a support shaft 44 provided below the shaft 43.

The above-mentioned feed roller 37 and paper feed roller 3
The positional relationship between 6, 36 'and the paper 34 is shown in FIG.
As shown in FIG.
The distance A to the center of 6'is set equal to the length A of the arc surface 38 of the feed roller 37. Also, the paper 34
Is a length such that a constant length B remains behind the delivery roller 37 even after the delivery of the distance A (see FIG. 7B).

The initial posture of the feed roller 37 is set such that one end of the D-cut surface 39 is in contact with the paper 34, as shown in FIG.

In the fifth embodiment configured as described above, when the paper 34 is fed by the feed roller 37, the driving of the actuator 19 is stopped and the roller clutch unit 1 is unlocked as shown in FIG. And Then, the torque of the motor 27 is transmitted to the feed roller 37 and the paper feed rollers 36 and 36 ', and the paper 3
4 is sent forward (see FIG. 12B). Paper 3
4 is sent out by the distance A and is sandwiched by the paper feed rollers 36, 36 ', and then the D-cut surface 39 of the send-out roller 37.
Face the paper 34, so the paper 34 is fed by the paper feed roller 3
It is sent out only by 6 and 36 '(see (c) in the same figure). At this time, it is necessary to stop the feed roller 37 with its D-cut surface 39 facing downward at least while feeding the distance B.

This timing can be automatically detected by, for example, detecting the feeding amount of the paper 34, and the actuator 19 from the control device based on the detection signal.
Drive to lock the roller clutch unit 1,
The delivery roller 37 is stopped.

The time for stopping the delivery roller 37 is
This is the time for feeding the paper 34 at least by the distance B.
After that time has elapsed, the roller clutch unit 1 is unlocked and the torque is transmitted to the delivery roller 37 again.

[0045]

As described above, in the roller clutch unit according to the present invention, torque transmission / interruption is performed by changing the wedge angle of the pocket accommodating the roller, so that the coil spring like the conventional spring clutch is used. It is more reliable than the one that uses the binding force of. Further, in the conventional case, in order to improve the locking force, it is necessary to reduce the spring inner diameter of the coil spring to increase the binding force, which causes a problem that the rotational torque during idling increases. In the case of, since the change in wedge angle is used,
The idling torque does not increase with respect to the allowable torque.

Further, since the torque input can be applied from the outer diameter portion of the clutch unit, the axial length of the clutch unit can be made shorter than in the conventional case. Furthermore, since a lubricant such as grease can be enclosed inside the clutch unit, the lubricating life can be extended.

Further, in the paper feeding device of the present invention, various functions can be exhibited by using the clutch unit as a driving force switching device or a driving force on / off switch.

[Brief description of drawings]

FIG. 1A is a perspective view of a first embodiment. (B) Exploded perspective view of the above

FIG. 2A is an enlarged front view of the above. (B) Front view of the coil spring as above (C) Sectional view of the above

FIG. 3 is a sectional view of a second embodiment.

4 (a) is a sectional view of the line IV-IV of FIG. 3 when locked. (B) Sectional view of the IV-IV line in FIG. 3 when the lock is released (C) Partly enlarged view of (a) (D) A partially enlarged view of (a)

FIG. 5 is a sectional view of a third embodiment.

6 (a) is a sectional view of the VI-VI line in FIG. 5 when locked. (B) Sectional view of the VI-VI line of FIG. 5 when unlocked

FIG. 7 is a sectional view of a modified example.

FIG. 8 is a perspective view of a fourth embodiment.

FIG. 9 is a side view of the above.

FIG. 10 is a perspective view of a fifth embodiment.

FIG. 11 is a side view of the above.

FIG. 12 (a) to (c) are explanatory diagrams of the same as above.

FIG. 13 is a sectional view of a conventional example.

14 (a) is a cross-sectional view of a locked state taken along line XX in FIG. 13 (b) is a cross-sectional view of the unlocked state taken along line XX in FIG.

[Explanation of symbols]

1, 1'roller clutch unit 2, 2'inner member 3,3 'coil spring 4, 4'roller 5 pockets 6 Cam surface 7 Shaft 9 Coil part 11 Locking hook 11a Reduced diameter side 11b Expanded side 12 Lock release hook 12a Reduced diameter side 12b Expanded side 13, 13 'torque transmission member 14 Control member 15 Engagement recess 16 Engagement recess 17,17 'ratchet car 18 screw members 19, 19 'actuator 21, 21 'ratchet 22 Shaft hole 23 Spring storage 25, 25 'paper feed tray 26, 26 'paper feed roller 27 motor 28 Motor shaft 29 drive gear 31,31 'Driven gear 32, 32 'roller gear 33,33 'Roller shaft 34,34 'paper 35 paper feed tray 36,36 'paper feed roller 37 Sending roller 38 arc surface 39 D cut surface 41 intermediate gear 42 roller gear 43 axes 44 Support shaft

Claims (6)

[Claims] 1. An inner member, an outer member rotatably fitted to an outer periphery of the inner member, and a predetermined member formed between an outer peripheral surface of the inner member and an inner peripheral surface of the outer member. It comprises a roller housed in a pocket having a wedge angle, a control member and a torque transmission member, and the roller transmits or releases torque to or from the torque transmission member by locking or unlocking the roller depending on the difference in wedge angle. In the roller clutch unit described above, the outer member is constituted by a coil spring, one of the hooks provided at both ends of the coil spring is defined as a lock hook, and the other is defined as a lock release hook. A load due to a reaction from the torque transmission member is applied to reduce the wedge angle of the pocket to lock the roller, and the lock release hook is loaded by the control member. Roller clutch unit, characterized in that releasing the lock addition to an enlarged wedge angle of the pocket. 2. The roller clutch unit according to claim 1, wherein the wedge angle is formed so as to be narrowed in a rotation direction of the inner member during torque transmission. 3. The torque transmission member is coaxially positioned with respect to the inner member, and is fitted around the outer periphery of the coil spring with a required gap, and the torque transmission member is provided with the locking member. The roller clutch unit according to claim 1 or 2, wherein a hook is engaged. 4. The roller clutch unit according to claim 3, wherein the control member is provided in a ratchet wheel that rotates integrally with the inner member, and an actuator that engages with and disengages from the ratchet wheel is attached. 5. A plurality of paper feed trays are respectively provided with paper feed rollers, and a drive force transmission device including the roller clutch unit according to claim 1 is provided corresponding to each paper feed roller. By selectively controlling the roller clutch unit of each driving force transmission device, the lock of the roller clutch unit corresponding to the paper feeding tray for feeding the paper is released, and the other one not feeding the paper A paper feeding device characterized in that a roller clutch unit corresponding to a paper feeding tray is locked. 6. The D-cut type feed roller is provided on the paper feed tray, the paper feed roller is provided in front of the paper feed tray, and the feed roller and the drive source are arranged between the feed roller and the drive source. A drive force transmission device including a roller clutch unit is provided, and the distance A from the leading edge of the paper in the paper feed tray to the paper feed roller is equal to the length A of the arc surface of the feed roller or A sheet feeding device that is set shorter than this and locks the roller clutch unit to temporarily stop the delivery roller in a state where the D-cut surface faces the sheet after the delivery on the arc surface is completed. .