JPH0159454B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a one-turn clutch device using a spring.

(Prior Art) A one-turn clutch device is a clutch device that is provided between a continuously rotating driving side and a driven side that selectively rotates in response to the driving side, and connects and disconnects the transmission of driving force. This is a clutch device that cuts off the transmission of driving force after the driven side has rotated once.

Various types of one-turn clutch devices have been proposed and put into practical use. An example of a spring type one-turn clutch device using a coil spring will be explained with reference to FIG. A drive-side sleeve 3 and a driven-side sleeve 4 are fitted into a pivot shaft 2 fixedly fixed to an immovable side plate 1 so as to be rotatable with each other while being restricted from moving in the axial direction. Drive side sleeve 3
The sprocket 5 is substantially integrally formed. This sprocket 5 is connected to a drive source (not shown) and is continuously driven to rotate only in a first direction. In the illustrated example, a gear 6 as a driven body is substantially integrally formed in the driven sleeve 4 . This gear 6 is an input gear of a driven mechanism (not shown). A relatively densely wound coil-shaped spring 7 is tightly wound around the outer peripheries of the driven sleeve 4 and the driving sleeve 3. The winding direction of the spring 7 is such that it is tightened when the sprocket 5 rotates in the first direction. A sleeve 8 forming a part of the control means is provided around the outer periphery of the spring 7, and one end 7a of the spring 7 is engaged with a notch 8a of the sleeve 8. In sleeve 8,
An engagement hole 8b is formed. A locking end 9a of a locking lever 9, which forms part of the control means, comes into contact with the outer circumferential surface of the sleeve 8 including the engagement hole 8b. In addition, in FIG. 1, the locking end 9a is shown separated from the sleeve for convenience of illustration.
The locking lever 9 is attached to a support shaft 10 as shown in FIG.
The locking end 9a is pivoted to the sleeve 8 by the tension of the spring 11, so that the locking end 9a is given a swinging behavior in the direction of abutting against the sleeve 8. At one end of the locking lever 9,
An operating rod of a solenoid 12 forming part of the control means is connected.

FIG. 2 shows a state in which the locking lever 9 locks the sleeve 8, and the drive-side sleeve 3 is continuously rotating in a first direction, for example, clockwise. and,
When the solenoid 12 is energized, the locking lever 9 swings clockwise to disengage the locking end 9a from the engagement hole 8b. When the restraint on the sleeve 8 is released, the spring 7 tightens as the drive-side sleeve 3 rotates and rotates accordingly. spring 7
When the winding is tightened to the driven sleeve 4, the sleeve 4 rotates clockwise, causing the gear 6 as a driven body to rotate in the same direction.

On the other hand, the power supply to the solenoid 12 is cut off after the locking end 9a is disengaged from the engagement hole 8b. Therefore, after the locking end 9a of the locking lever 9 escapes from the engagement hole 8b, it comes into contact with the outer peripheral surface of the sleeve 8 and rubs against it. When the sleeve 8 rotates once, the engaging hole 8b is locked by the locking end 9a, and the sleeve 8 is stopped. When the sleeve 8 stops, it means that one end 7a of the spring 7 is locked, and after that, the spring 7 is no longer tightened, and rotation transmission from the drive-side sleeve 3 is cut off.

(Problems to be Solved by the Invention) The above is the general operation of a one-turn clutch device. In the state where the sleeve 8 is locked, the drive-side sleeve 3 continues its rotation. In other words, it can be said that the drive-side sleeve 3 and the spring 7 are in a state of sliding contact with each other.

By the way, since the one-turn clutch controls the amount of work on the driven side, the higher the accuracy of its rise, the better. However, as described above, in the conventional case, the spring 7 and the drive-side sleeve 3 rub against each other in a state where the driving force transmission is cut off, resulting in a problem that the sliding surfaces of both are worn out. This appears as a phenomenon in which the clutch start-up becomes worse over time. Also,
Since the springs are tightly wound around both sleeves to ensure rising accuracy and transmission of driving force, a considerable load is applied when the drive-side sleeve rotates.

Incidentally, one-turn clutches are often used in paper feeding devices for facsimile machines and copying machines. For example, the paper feed roller of a facsimile machine is driven via a one-turn clutch;
The fed sheet is fed by a length corresponding to one revolution of the paper feeding roller. In this case, if the responsiveness of the clutch is poor, the sheet being sent out will not advance a predetermined length, making it impossible to convey it to the next process. Further, even if the responsiveness is good, if the paper feed roller does not stop after one rotation and overruns due to inertia, there is a problem that an excessive number of sheets may be fed out.

In other words, there is no problem if the clutch is used in such a way that it only needs to rotate once on the driven side, but if the clutch is made to rotate once intermittently, it is always necessary to start the driven side. It is necessary to keep the position constant. In particular, when the cam is interlocked with the driven side, if the relative positions of the cam and the cam follow change every time the cam rotates, control by the clutch becomes impossible.

The present invention has been made in view of the above, and includes:
Even if rotational force transmission is repeatedly disconnected, the starting position of the driven side is always constant, and when the driven side is stopped, the friction between the drive body and spring is reduced to prevent wear and tear on the drive body. An object of the present invention is to provide a one-turn clutch device that can reduce the load on the clutch.

(Means for Solving the Problems) The clutch device of the present invention includes a driving body that continuously rotates in one direction, a driven body that rotates as a result of transmission of the rotation of the driving body, and a driven body that rotates the rotation of the driving body to the driven body. A one-turn clutch device comprising a spring having a tendency to act in the direction of transmitting torque to the body, and a control means for controlling the action of the spring to connect and disconnect rotational force transmission between the driving body and the driven body. a positioning means for locking the driven body in a predetermined position; The present invention is characterized in that a releasing means is provided for expanding the spring in a direction that separates the driving body and the spring from each other when the driving body is placed in the position.

(Operation) When the control means cuts off the rotational transmission between the driving body and the driven body, the positioning means positions the driven body at that position, and the releasing means expands the spring to separate the spring and the driven body. Separate.

(Example) Hereinafter, the present invention will be explained in detail with reference to illustrated examples.

A first embodiment of the present invention will be described based on FIGS. 3 to 6.

3 to 6, a drive side sleeve 48 and a driven side sleeve 49 are rotatably supported on the pivot shaft 20. As shown in FIGS. A sprocket 21 as a driving body is integrally formed on the driving side sleeve 48. A gear 22 as a driven body and a disk 50 forming a part of positioning means are each integrally formed in the driven sleeve 49 . A single coil-shaped spring 5 is tightly wound around the outer peripheries of the driving side sleeve 48 and the driven side sleeve 49.
1 is wrapped. One end 51 of the spring 51
a is the notch 49a (10th
(see figure).

A sleeve 52 is provided around the outer periphery of the spring 51, and the other end 51b of the spring is locked in a notch 52a of the sleeve 52. Sleeve 52
A positioning disk 53 having a positioning notch 53a is inserted and fixed therein.

One end of each of release levers 54 and 55 serving as release means is pivotally attached to the disks 50 and 53. The other ends of the release levers 54 and 55 are pivotally connected to each other by a pin 56. That is, the disks 50 and 53 are connected by release levers 54 and 55, but also by a spring 51. And disk 50, 53
When the spring 51 is tightly wound,
As shown in FIG. 5, the release levers 54 and 55 maintain their mutual positions so that the pin 56 is located at the upper end of the notch 53a. The winding direction of the spring 51 is determined by rotating the disk 50 clockwise.
When the disk 53 is rotated counterclockwise, it is unwound.

A control means/positioning means 28 is arranged near the periphery of the disk 53. This positioning means 28 includes a locking lever 5 pivotally mounted on a support shaft 58.
7. It consists of a spring 59 that urges the lever in a direction to bring the locking portion 57a at one end of the lever into contact with the peripheral edge of the disk 53, and a solenoid 33 connected to the other end of the lever. The solenoid 33 is energized only when transmitting the rotation of the driving side to the driven side. As shown in FIG.
a is brought into contact. The locking lever 57 is swingably supported by a support shaft 58, and is given a sliding habit in the direction of contacting the disk 53 by the elasticity of a spring 59. In addition to the control function, the locking lever 57 is also provided with the functions of positioning means and release means.

FIG. 4 shows a state in which the rotation of the driving side is not transmitted to the driven side, and the locking lever 57 engages with the notch 53a of the disk 53 to position the driven side. In this state, the solenoid 33
When is excited, the locking lever 57 is swung clockwise as shown in FIG.
a escapes from the notch 53a. At this time, since the drive side sprocket 21 continues clockwise, the drive side sleeve 48 tightens the spring 51.

The spring 51 that is tightened is the driven sleeve 4
When the gear 9 is rotated, the rotation on the driving side is transmitted to the driven side, and the gear 22 starts to rotate clockwise. On the other hand, the energization of the solenoid 33 is released after the locking portion 57a of the locking lever 57 escapes from the notch 53a and the disk 53 starts rotating, as shown in FIG. ,
Thereafter, the locking lever 57 is swung counterclockwise by the elasticity of the spring 59, and the locking portion 57a is brought into contact with the peripheral edge of the disk 53.

When the notch 53a of the disk 53 rotates once, the locking portion 57a of the locking lever 57 is fitted into the notch 53a by the elastic force of the spring 59, thereby locking the disk 53. When the disk 53 is locked, the spring 51 whose one end 51b is locked in the notch of the sleeve 52 integrated with the disk 53 is locked, and the spring 51 is no longer driven by the rotation of the drive side sleeve 48. becomes loose and rotational force transmission is cut off.

Further, the locking portion 57a of the locking lever 57 is notched in the notch 5.
3a, this locking portion 57a pushes the mutual pivoting portions of the release levers 54, 55 to spread both levers. One release lever 55 is pivoted to the locked disc 53, so its pivot point does not change, but the other release lever 54 is pivoted to the free disc 50. , its pivot point moves clockwise. In other words, the disk 50 is rotated slightly clockwise. The rotation direction of this disk 50 is
This is the direction in which the spring 51, which has one end 51a locked, is loosened.

That is, in the state shown in FIG. 4, not only the rotation on the driving side is not transmitted to the driven side, but also the spring 51 is in a relaxed state. for that,
The spring 51 wound around the continuously rotating drive-side sleeve 48 is separated from the sleeve circumferential surface or expanded against its tendency to wrap around the sleeve. Therefore, not only is there no load on the rotation of the drive side, but the sliding friction between the sleeve and the spring is minimized, resulting in less wear.

Next, a second embodiment of the present invention will be described based on FIGS. 7 to 10. In the first embodiment, the pair of release levers were expanded to loosen the spring when the rotational force transmission was cut off, but in this embodiment, the difference in phase between the notches of the pair of disks is utilized. In this embodiment, the springs are expanded in the same manner as in the first embodiment, and the same members as in the first embodiment are given the same reference numerals.

7 to 10, a positioning disk 60 having a notch 60a is fixed to the sleeve 52. As shown in FIGS. A positioning disk 61 is integrally formed in the driven sleeve 49, and a notch 61a is formed in this disk. A notch 49a is formed in the driven sleeve 49 to lock one end of the spring 51. disk 6
0 and 61 have the same diameter, and as shown in FIG. 8, the notches 60a and 61a are positioned with different phases from each other. The mutual positions of these two disks are as follows when the spring 51 is in its natural state.
After determining the positions of both notches, the disc 60 is fixed to the sleeve 52. Near the periphery of the disk 60, a control means/positioning means 2 is provided.
8 are arranged. The positioning means 28 includes a locking lever 30 rotatably supported on a support shaft 29;
A locking pin 47 fixed to one end of this lever,
A spring 32 that gives the locking lever 30 swingability in a direction that brings the pin 47 into contact with the peripheral edges of the disks 60 and 61; a solenoid 33 connected to the other end of the locking lever; and a solenoid 33 connected to the other end of the locking lever 30. It consists of a stopper 34 that restricts the swinging of the shaft.

FIG. 9 shows that the disk 6 is fixed by the locking pin 74.
0 and 61 indicate a state in which the sprocket 21 is positioned at a predetermined position, the driven side is stopped, and the driving side sprocket 21 is continuously rotating clockwise. When the solenoid 33 is energized in the state shown in FIG.
Escape from 0a, 61a. When the restraint on the driven side is released, the spring 51 is tightened, and the rotation of the driving sleeve 48 is transmitted to the driven sleeve 49.

The energization to the solenoid 33 is cut off after the locking pin 47 escapes from the notches 60a, 61a, and after that, the locking pin 47 is pushed against the circumferential surface of the disks 60, 61 by the elasticity of the spring 32. sliding into contact with.

Then, when the disks 60 and 61 rotate once,
The locking pins 47 fit into the respective notches 60a, 61a, causing the disks to rotate slightly in opposite directions. That is, when the locking pin 47 engages with the notch and moves toward the bottom thereof, the disk 60 is relatively rotated counterclockwise and the disk 61 is relatively rotated clockwise. disk 60
One end 51b of the spring 51 is locked to the sleeve 52 that is integrated with the disk 61, and the other end 51a of the spring is locked to the driven sleeve 49 that is integrated with the disk 61, so that the disks 60 and 61 are oriented in opposite directions. When the spring 51 is rotated, the spring 51 is expanded against its tendency to tighten. The effect after the spring expands is the same as that of the first embodiment.

(Effects of the Invention) As described above, according to the present invention, when the rotational force transmission between the driving body and the driven body is cut off, the driven body always occupies a predetermined position and stops. Next, when rotational force is transmitted, the engine always starts from a certain position, which improves the accuracy of control of the driven body or the driven mechanism linked to it, and also allows the driven body to lock after one rotation. When this occurs, the spring is expanded and moved away from the continuously rotating driving body, so the friction between the driving body and the spring is suppressed as much as possible, so the driving body continues to rotate without any load. At the same time, wear of the drive body and spring is prevented, and the responsiveness of the clutch can be maintained stably over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an example of a conventional spring type one-turn clutch device, FIG. 2 is a front sectional view of the same, FIG. 3 is a side sectional view showing a first embodiment of the present invention, and FIG. The figure is a partially broken front view of the same as above, FIGS. 5 and 6 are respectively operational views of FIG. 4, FIG. 7 is a side sectional view showing the second embodiment of the present invention, and FIG. 8 is a front view of the same as above. , FIG. 9 is an operational view of FIG. 8, and FIG. 10 is a perspective view showing the main parts of the same. 20... Axis, 21... Sprocket, 22...
...gear, 50, 53, 60, 61... disk,
30, 57... Locking lever, 33... Solenoid, 34... Stopper, 47... Locking pin, 48
... Drive side sleeve, 49 ... Driven side sleeve,
51...Spring, 52...Sleeve, 54,
55...release lever, 56...pin.

Claims (1)

[Scope of Claims] 1. A driving body that continuously rotates in one direction, a driven body that rotates as a result of the rotation of the driving body being transmitted, and a habit that acts in the direction of transmitting the rotation of the driving body to the driven body. and a control means for controlling the action of the spring to connect and disconnect rotational force transmission between the driving body and the driven body. a positioning means for stopping the driven body at a predetermined position when the driven body is placed in an operating position where driving force transmission between the driven body and the driven body is cut off; and a positioning means for driving the spring when the control means is placed in the operating position. A one-turn clutch device comprising a release means that expands in a direction away from the body.