JP3176491B2 - One-way clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch which is mounted on, for example, a paper feed roller of a paper feeder and transmits power only in one direction.

[0002]

2. Description of the Related Art For example, a one-way clutch mounted between a paper feed roller (calling roller) of a paper feeder and a rotation shaft thereof and transmitting the rotation to the paper feed roller only when the rotation shaft rotates in one direction is known. It is well known. As a conventional one-way clutch, a one-way clutch such as a spring system, a bearing system, and a ratchet system is known.

A one-way clutch of the spring type uses a coil spring wound around a rotating shaft and utilizes the tightening force. In the one-way clutch of the bearing type, a sprag such as a ball or a roller bites in only one direction between a driving side and a driven side. Further, the ratchet type one-way clutch is provided with ratchets on the driving side and the driven side, and one of the members is pressed against the other member by a spring or the like to engage the ratchet.

[0004]

In the spring type one-way clutch, a torque is generated by friction of the spring at the time of idling, so that the load at the time of idling is large.
Since the relationship between the diameter of the rotating shaft and the diameter of the spring is directly related to the magnitude of the transmission torque and the idling torque, the dimensions of the members require precision. Therefore, there is a problem that manufacturing is difficult and cost increases.

Also, the one-way clutch of the bearing type has a problem that the mechanism is complicated and a metal roller (housing) for fitting the bearing is indispensable, so that it is expensive.

Further, the ratchet type one-way clutch has a simple mechanism and is low in cost, but has a problem that a rattling sound is generated at the ratchet portion during idling.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in conventional one-way clutches and to provide a one-way clutch which is inexpensive and has the same performance.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a one-way clutch for transmitting rotational force in only one direction, which is movable between an input member and an output member in a direction perpendicular to the rotational direction. A notch in which a protruding portion is provided in a direction perpendicular to a rotation direction on one of the input member and the transmitting member, and the protruding portion is fitted on the other member, A notch whose width in the rotation direction is wider than the width in the rotation direction of the protruding portion and the depths of the notches at both ends thereof are different from each other is provided, and a surface connecting the both ends is an inclined surface. A ratchet is provided on a joint surface with the output member, and the transmission member is rotated by one-way rotation of the input member, and the tip of the protruding portion presses the slope to move the transmission member in a direction approaching the output member. The ratchet Are engaged, transmitting the rotation of the input member to the output member via the transmission member, and when the input member rotates in the opposite direction, the transmission member moves away from the output member by pressing the slope of the ratchet. The ratchet is disengaged by moving in the direction and the transmission of the rotational force to the output member is released.

According to another aspect of the present invention, there is provided a rotary shaft in which one of the input member, the transmission member, and the output member is fitted integrally with another two members. Suggest to do.

[0010]

Since the notches of the transmission member have different depths at both ends, the rear end is inclined with respect to the rotation direction. Then, when the input member rotates in one direction, the distal end of the protrusion fitted into the notch presses the rear end that is inclined with respect to the rotation direction to move the transmission member in a direction approaching the output member. . Then, the ratchets of the transmission member and the output member are engaged with each other, and the rotation of the input member is transmitted to the output member via the transmission member. Also, when the input member rotates in the opposite direction, the transmission member moves in a direction away from the output member by slipping on the slope of the ratchet, the ratchet is disengaged, and the transmission of the rotational force to the output member is released, and the idle rotation occurs. State.

Other effects will be apparent from the following description of the embodiments.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention. As shown in this figure, the one-way clutch of the present embodiment is composed of three members, a power input unit 1, a power transmission unit 2, and a power output unit 3.

The power input unit 1 has a two-stage cylindrical shape in which the diameter of one end 5 of the cylindrical member 4 is slightly larger, and is driven to rotate in the direction of arrow R by a driving means (not shown). A projection 6 is formed from the large-diameter end 5 along the cylindrical member 4. Power transmission unit 2 and power output unit 3
Has a cylindrical shape, and is fitted into the cylindrical member 4 of the power input unit 1. A notch 7 is provided on a side of the power transmission unit 2 facing the large-diameter end 5. The circumferential width of the notch 7 is appropriately wider than the circumferential width of the protrusion 6 formed on the power input unit 1. The circumferential ends 7a and 7b of the notch 7 are different from each other in the depth of the notch, that is, the length in the axial direction of the cylinder, and are located on the upstream side with respect to the rotation direction R of the power input unit 1. The length of the portion 7a is the downstream end 7
It is formed to be longer than b. Therefore, the rear end 7c of the notch connecting both ends 7a and 7b forms a slope that is oblique to the circumferential direction. On the other hand, a ratchet claw 8 is formed at the opposite end of the power transmission unit 2. At the end of the power output unit 3 on the power transmission unit 2 side, a ratchet recess 9 having a shape to be fitted to the above-described ratchet claw 8 is formed.

FIG. 2 is a side view showing how the one-way clutch of this embodiment transmits power. As described above, the power transmission unit 2 and the power output unit 3 are fitted into the columnar member 4 of the power input unit 1, and the notch 7 of the power transmission unit 2 is fitted into the projection 6 of the power input unit 1. ing. When the power input unit 1 is rotated in the direction of arrow R by driving means (not shown), the tip of the projection 6 rotates while abutting on the slope 7c of the notch 7, and the power transmission unit 2 is moved to the left in the drawing, that is, Move to the output unit 3. Then, the side surface of the protrusion 6 is the end 7 b of the notch 7.
, The power transmission unit 2 rotates following the power input unit 1. When the power transmission unit 2 moves to the left in the figure while rotating, the ratchet claw 8 meshes with the ratchet recess 9. As a result, the power output unit 3 also rotates in the direction of arrow R together with the power transmission unit 2, and the driving force is transmitted from the power input unit 1 to the power output unit 3.

When the power input unit 1 rotates in the direction opposite to the arrow R, the protrusion 6 abuts on the end 7a of the notch 7, and the power transmission unit 2 rotates in the direction opposite to the arrow R. Then, the slope of the ratchet claw 8 is pushed by the slope of the ratchet recess 9, and the power transmission unit 2 moves rightward in the figure. At this time,
Since the protrusion 6 is in contact with the deeper end 7a of the notch 7, the power transmission unit 2 can be moved. The ratchet claw 8 is completely disengaged from the ratchet recess 9 when the tip of the projection 6 comes into contact with the slope of the deep part of the notch 7. When the ratchet is disengaged, the power input unit 1
Is not transmitted to the power output unit 3 and is in an idling state.

When the power output unit 3 is rotated in the direction of arrow R by external force while the rotation of the power input unit 1 is stopped, or when the power input unit 1 is rotated in the direction of arrow R, Power output unit 3 at a faster speed when it is
Is rotated in the direction of arrow R by the external force, the one-way clutch is idle, similarly to the case where the power input unit 1 rotates in the direction opposite to the direction of arrow R.

FIG. 3 is a side view showing a state in which the power output unit 3 of the one-way clutch of this embodiment is rotated in the direction of arrow R by an external force and is in an idling state. When this one-way clutch is mounted on, for example, a call roller of a paper feeding device, the call roller is mounted on the power output unit 3, and the driving force is given to the power input unit 1. When the sheet is conveyed by another conveyance roller after the page is called by the call roller, the driving force to the call roller is released, and the rotation of the power input unit 1 is stopped. However, since the call roller is rotated by the conveyed sheet, the power output unit 3 continues to rotate. In FIG. 3, when only the power output unit 3 is rotated in the direction of arrow R (or when the rotation speed of the power output unit 3 is higher than the rotation speed of the power input unit 1), the slope of the ratchet claw 8 and the ratchet The power transmission unit 2 moves to the right in the figure as the slope of the recess 9 slides. Then, when the deep portion of the slope of the notch 7 comes into contact with the tip of the projection 6, the tip of the ratchet claw 8 comes out of the ratchet recess 9, and the engagement between the two is released (the figure shows this state. There). As a result, even if the power output unit 3 rotates, the rotation is not transmitted to the power transmission unit 2 and the power input unit 1, and only the power output unit 3 rotates (or, alternatively, the power transmission unit 2 and the power input unit 1).
Irrespective of the rotation of the power output unit 3).

Incidentally, the distance between the large-diameter end portion 5 of the power input portion 1 and the power output portion 3 in the axial direction (the left-right direction in the figure) does not change between power transmission and idling. That is, when power is transmitted, the protruding portion 6 has a notch
The distance that the power transmission unit 2 is pushed to the left side in the figure along the line is the same as the distance that the slope of the ratchet recess 9 and the slope of the ratchet claw 8 slide during idling to push the power transmission unit 2 to the right side in the figure. Because it is set to Therefore,
During power transmission and during idling, only the power transmission unit 2 moves in a direction perpendicular to the rotation direction (left-right direction in the figure).

In this embodiment, the power input unit 1
The power transmission part 2 is provided with a notch 7, the power transmission part 2 is provided with a ratchet claw 8, and the power output part 3 is provided with a ratchet recess 9. The notch 7 may be provided in the power input unit 1. In this case, the direction of the slope of the notch 7 must be reversed, that is, the notch on the upstream side in the rotation direction must be shallow and the notch on the downstream side must be deep.
Further, the ratchet pawl 8 may be provided on the power output unit 3 and the ratchet recess 9 may be provided on the power transmission unit 2. Even in that case,
The direction of the ratchet slope must be reversed, that is, the ratchet pawl 8 is raised from the downstream side to the upstream side in the rotational direction.

In the present embodiment, the power transmission unit 2
The power output unit 3 is inserted into the cylindrical member 4 of the power input unit 1. The power input unit 1 has a cylindrical shape with only the large-diameter end 5, and the three cylindrical members are formed of a normal metallic rotating member. It is also possible to form a one-way clutch by fitting the shaft (core bar). However, in such a case, looseness between the respective members and the core metal, eccentricity, and the like occur. In the configuration as in the present embodiment, the manufacturing accuracy of each member is easier to manage than the cored bar, and eccentricity and the like can be prevented. Further, a configuration in which the core metal itself is not used may be adopted.

Further, the one-way clutch of the present invention is composed of three members, and its structure is not only simple but also
It is very easy to assemble the three members. Further, since the tip of the ratchet claw 8 is disengaged from the ratchet recess 9 during idling, no rattling noise is produced unlike a conventional ratchet clutch.

FIG. 4 is a perspective view showing a state in which another embodiment of the present invention is mounted on a paper feeding roller (calling roller) 17 of a paper feeding apparatus. In this example, the power transmission unit 12
The two ratchet claws 18 are provided, and the ratchet recess 19 is provided over the entire periphery of the end face of the power output unit 13. The driving force is applied to a gear 16 provided integrally with the power input unit 11 in the direction of arrow R. Other configurations are the same as those of the above-described embodiment described with reference to FIGS.

The call roller is in contact with the paper stacked on the paper feed table of the paper feeder at a predetermined pressure. Then, the sheet is rotated to call out the sheet, and the sheet is delivered to the next conveyance roller or registration roller. Normally, the drive is stopped after the sheet is delivered, but since the call roller is in contact with the sheet fed by the transport roller, it is driven on the fed sheet. Then, when the trailing edge of the sheet passes below the call roller, the sheet is driven again and starts rotating, and the next sheet is called. Since the call roller is in contact with the sheet even after the sheet is delivered to the roller in the next process, a one-way clutch is incorporated in order to prevent a load from being applied to the sheet. Therefore, only the call roller is separated from the drive mechanism and rotates lightly, and the transport roller and the registration roller in the next process can lightly feed the sheet.

In FIG. 4, the power input unit 11 has an arrow R
Is rotated in the direction of
The paper feed roller 17 mounted on the outer periphery of the power output unit 13 is rotated in the same direction to call out a sheet (not shown). And the transport roller (not shown) of the next process
When the paper is delivered to the power supply, the drive is stopped, and the power input unit 11 stops rotating. At this time, since the feed roller 17 and the power output unit 13 continue to rotate, the power transmission unit 12 slides toward the large-diameter end 15 side, and the ratchet claw 18 and the ratchet recess 19 are disengaged from each other. 17 can be idle.

FIG. 5 is a perspective view showing still another embodiment of the present invention. As shown in this figure, the power input unit 21 is formed in a cylindrical shape. Then, a columnar member 24 is formed in the power output section 23, and the power input section 21 and the power transmission section 2 are formed.
2 is inserted into the cylindrical member 24. For other configurations,
This is the same as the embodiment described with reference to FIGS.

FIG. 6 is a perspective view showing still another embodiment of the present invention. As shown in this figure, the power input unit 31 and the power output unit 33 are formed in a cylindrical shape, and the power transmission unit 32
Are formed on both sides thereof. Then, the power input unit 31 is inserted into the column member 34a, and the power output unit 33 is inserted into the column member 34b. Other configurations are the same as those of the above-described embodiment described with reference to FIGS.

[0028]

As described above, according to the one-way clutch of the present invention, it is possible to provide a one-way clutch having the same performance as the conventional one-way clutch with a simple structure and at low cost. Also,
Assembly work becomes very easy. Further, no ticking sound is generated when the vehicle spins.

According to the second aspect of the invention, it is possible to reduce rattling or the like after assembly and prevent eccentricity. Also,
It is also possible to adopt a configuration without using a metal rotating shaft.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is a side view showing a state during power transmission.

FIG. 3 is a side view showing a state at the time of idling.

FIG. 4 is a perspective view showing a state in which another embodiment of the present invention is mounted on a paper feed roller of a paper feed device.

FIG. 5 is a perspective view showing still another embodiment of the present invention.

FIG. 6 is a perspective view showing still another embodiment of the present invention.

[Explanation of symbols]

 1, 11, 21, 31 Power input unit 2, 12, 22, 32 Power transmission unit 3, 13, 23, 33 Power output unit 4, 14, 24, 34 Cylindrical member 5, 15 Large diameter end 6 Projection 7 Notch 8,18 Ratchet claw 9,19 Ratchet recess 17 Feed roller

Claims (2)

(57) [Claims] 1. A one-way clutch for transmitting torque only in one direction, wherein a transmission member movable in a direction perpendicular to a rotation direction is provided between an input member and an output member, wherein the input member or the transmission member is provided. A protrusion is provided in one of the members in a direction perpendicular to the rotation direction, and the other member is a notch in which the protrusion is fitted, and the width in the rotation direction is the width of the protrusion in the rotation direction of the protrusion. A notch that is wider than the width and has different cutout depths at both ends thereof is provided with a notch in which a surface connecting the both ends is an inclined surface; a ratchet is provided at a joint surface between the transmission member and the output member; The transmitting member is rotated by the rotation of the member in one direction, and the tip of the protruding portion presses the slope to move the transmitting member in a direction approaching the output member, so that the ratchet is in a meshing state, and the input member has Times Is transmitted to the output member via the transmission member.When the input member rotates in the reverse direction, the transmission member moves in a direction away from the output member due to the pressing of the slope of the ratchet, and the engagement of the ratchet is increased. The one-way clutch is released, and transmission of the rotational force to the output member is released. 2. The rotating shaft according to claim 1, wherein one of the input member, the transmitting member, and the output member is integrally formed with a rotating shaft into which two other members are fitted. One-way clutch.