JPH0645063Y2 - Electromagnetically controlled spring clutch mechanism - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetically controlled spring clutch mechanism that transmits a rotational driving force by utilizing contraction of a coil spring means.

<Prior Art and Its Deficiencies> Conventionally, an electromagnetically controlled spring clutch mechanism using coil spring means has been widely used in order to selectively transmit a rotational driving force of an input rotary element that is rotationally driven to an output rotary element. ing. A clutch mechanism of this type is disclosed in
The known clutch mechanism includes a first boss member that rotates integrally with the input rotary element and a second boss member that rotates integrally with the output rotary element. A boss member, a coil spring means fitted over the first boss member and the second boss member, and a rotation control sleeve for fitting the coil spring means and controlling contraction of the coil spring means. An armature arranged in the vicinity of the rotation control sleeve, a biasing spring means for biasing the armature toward the rotation control sleeve, and an electromagnetic force for magnetically attracting the armature against the biasing action of the biasing spring means. The rotation control sleeve and the armature are provided with interengaging pawls, respectively. Therefore, when the electromagnetic means is deenergized, the action of the biasing spring means causes the claws of the rotation control sleeve and the armature to engage with each other, thereby preventing the rotation of the rotation control sleeve and thus contracting the coil spring means. There is no such thing. On the other hand, when the electromagnetic means is biased, the engagement of the rotation control sleeve and the claw of the armature is released, whereby the rotation of the rotation control sleeve is allowed, and thus the contraction of the coil spring means causes the boss member to move. The second boss member is drivingly connected as required.

However, the electromagnetically controlled spring clutch mechanism as described above has the following problems to be solved.

First, the claws of the rotation control sleeve or the claws of the amateur are circumferentially spaced (there may be only one), and therefore, as will be readily understood, the output rotary element may have a predetermined angle ( This clutch mechanism can be conveniently used for rotation control based on, for example, 360 degrees or 180 degrees, but the transmission of the driving force from the input rotary element should be interrupted at substantially the same time as the energization of the electromagnetic means. In this case, such a clutch mechanism cannot be used.

Second, the structure of the clutch mechanism itself is complicated and the production cost is high.

<Purpose of the Invention> The present invention has been made in view of the above facts, and its main purpose is relatively simple, in which drive connection and disconnection can be performed substantially at the same time as energizing and deactivating electromagnetic means. It is to provide an electromagnetically controlled spring clutch mechanism having various configurations.

<Summary of Invention> According to the present invention, in an electromagnetically controlled spring clutch mechanism for selectively transmitting the rotational driving force of an input rotary element to an output rotary element, a first boss member that rotates integrally with the input rotary element. A second boss member disposed adjacent to the first boss member and rotating integrally with the output rotation element, and fitted over the first boss member and the second boss member, Coil spring means for drivingly connecting the two by the contraction thereof, and a rotation control sleeve fitted with the coil spring means so as to be slidable in the axial direction and having one end locked to the coil spring means. A high friction member disposed on at least one of the rotation control sleeve and the fixing member for preventing rotation of the rotation control sleeve, and a bias for pressing the rotation control sleeve against the fixing member via the high friction member. Spring means and Electromagnetic control means for axially actuating the rolling control sleeve against the biasing action of the biasing spring means, the rotation control being effected by the biasing spring means when the electromagnetic means is deenergized. The sleeve is pressed against the fixed member via the high friction member, which prevents the rotation of the rotation control sleeve and thus the coil spring means is not contracted, while the electromagnetic means is biased. The magnetic attraction of the electromagnetic means causes the rotation control sleeve to be axially operated against the biasing action of the biasing spring means and separated from the fixing member, whereby the rotation control sleeve is rotatably supported. Thus, there is provided an electromagnetically controlled spring clutch mechanism characterized in that the coil spring means is allowed to contract.

In such an electromagnetically controlled spring clutch mechanism, when the electromagnetic means is biased, the rotation control sleeve is axially operated against the biasing action of the biasing spring means, and the fixing member via the rotation control sleeve and the high friction member is provided. When the coil spring means contracts, the first boss member and the second boss member are drivingly connected to each other via the coil spring means. On the other hand, when the electromagnetic means is deenergized, the biasing spring means causes the rotation control sleeve and the fixed member to be connected to each other via the high friction member, which prevents the coil spring means from contracting and the first boss. The aforementioned drive connection between the member and the second boss member is released.

<Preferred Specific Example of the Invention> A specific example of the electromagnetically controlled spring clutch mechanism according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, the electromagnetically controlled spring clutch mechanism shown is
It comprises a first boss member 2 which rotates integrally with the input rotary element and a second boss member 4 which rotates integrally with the output rotary element. In the first boss member 2, from the one end (the left end in FIG. 1) toward the other end, the annular flange portion 6, the large diameter portion 8 having an outer diameter somewhat smaller than the annular flange portion 6, and the large diameter portion 8 The medium diameter portion 10 having a slightly smaller outer diameter and the small diameter portion 12 having a slightly smaller outer diameter than the medium diameter portion 10 are provided, and the outer diameter is gradually reduced. In the illustrated example, the input rotary element is composed of a toothed pulley 14. The toothed pulley 14 has an end wall 16 and a cylindrical peripheral side wall 18 extending rightward from the end wall 16 in FIG. 1, and a plurality of teeth 20 are provided on the outer peripheral surface of the cylindrical peripheral side wall 18. . A key groove is formed on the inner peripheral surface of the end wall 16 of the toothed pulley 14, and a key groove is also formed on the outer peripheral surface of the annular flange portion 6 of the first boss member 2.
The toothed pulley 14 is mounted so as to rotate integrally with the first boss member 2 by mounting the end wall 16 of 14 on the annular flange portion 6 and then inserting the key members 22 into both key grooves. There is. The toothed pulley 14 and the first boss member 2 may be integrally formed.

The second boss member 4 has a small diameter portion 24, an intermediate diameter portion 26 having an outer diameter somewhat larger than the small diameter portion 24, and the intermediate diameter portion 26 from one end (the left end in FIG. 1) toward the other end. A large-diameter flange portion 28 having a slightly larger outer diameter is provided, and the outer diameter is gradually increased. In the illustrated example, the output rotary element is composed of a hollow shaft member 30. Through holes are formed in the medium diameter portion 26 of the shaft member 30 and the second boss member 4, and after the second boss member 4 is attached to the shaft member 30, the pin 32 is press-fitted through these through holes. Thus, the second boss member 4 is mounted so as to rotate integrally with the shaft member 30. The shaft member 30 and the second boss member 4 may be integrally formed. The first boss member 2 is rotatably mounted on the shaft member 30.

The first boss member 2 and the second boss member 4 are further configured as follows. That is, the outer diameters of the small diameter portion 12 of the first boss member 2 and the small diameter portion 24 of the second boss member 4, which act as boss portions, are substantially the same, and the opposite end surfaces thereof are brought close to or in contact with each other. . Also, the outer diameters of both the middle diameter portion 10 of the first boss member 2 and the middle diameter portion 26 of the second boss member 4 are substantially the same.

Coil spring means 34 is provided by fitting the small-diameter portion 12 of the first boss member 2 and the small-diameter portion 24 of the second boss member 4,
Further, the coil spring means 34 is fitted and the rotation control sleeve
36 is arranged slidably in the axial direction. The coil spring means 34 extends across both the small diameter portions 12 and 24, and has one end.
Winding from 38 to the other end 40 clockwise when viewed from the left side in FIG. 1 (that is, the direction in which the rotation control sleeve 36 contracts as the toothed pulley 14 rotates in the direction indicated by the arrow 42). Has been done. The rotation control sleeve 36 is composed of a hollow cylindrical sleeve member, and both ends thereof are respectively
It is rotatably supported by the medium diameter portion 10 of the first boss member 2 and the medium diameter portion 26 of the second boss member 4. Rotation control sleeve
An annular flange 44, which projects outward in the radial direction, is integrally provided at the left end of FIG. The rotation control sleeve 36 is made of a magnetic material so as to be magnetically attracted by the action of an electromagnetic means described later. In the specific example, further, an elongated notch 46 in the left-right direction in FIG. 1 is formed in the left end portion of the rotation control sleeve 36 in FIG. 1, and a recess is formed in the small diameter portion 24 of the second boss member 4. One end 38 of the coil spring means 34 is formed and the cutout is formed.
It is received by 46 so that it can move left and right, and the other end 40
Is locked in the recess of the small diameter portion 24.

Electromagnetic means 48 is further provided so as to cover the rotation control sleeve 36. The illustrated electromagnetic means 48 is composed of a field 50 and a coil body 52 arranged in the field 50. The field 50 has a circular end wall 54 and a peripheral wall 56 extending cylindrically to the right in FIG. 1 from the outer peripheral end of the end wall 54, and one end (the right end in FIG. 1) thereof is open. A cover wall 58 is attached to the open end of the field 50 by a mounting screw 7, and the opening is covered by the cover wall 58. The end wall 54 of the field 50 is rotatably supported by the large diameter portion 8 of the first boss member 2, and the cover wall 58 is rotatably supported by the medium diameter portion 26 of the second boss member 4. The cover wall 58 is further provided with a protrusion 60 that protrudes beyond the peripheral wall 56. A notch 62 for locking is formed in the protruding portion 60, and a pin 64 fixed to a stationary portion is locked in the notch 62 as shown by a chain double-dashed line. Therefore, the field 50 and the cover wall 58 do not rotate substantially and function as a fixing member, and the first boss member 2 and the second boss member 4 rotate with respect to the field 50 and the cover wall 58. To be done. The coil body 52 is disposed on the left side of the annular space defined by the field 50 and the cover wall 58 in FIG. 1, and extends over the large diameter portion 8 of the first boss member 2 and the rotation control sleeve 36. Located outside to cover.

A bias coil spring 66 (constituting bias spring means) for biasing the rotation control sleeve 36 to the right in FIG. 1 is provided on the right portion of the annular space in FIG. The bias coil spring 66 is disposed by fitting the rotation control sleeve 36, one end of which is abutted against an annular spring receiving member 68 fixed to the coil body 52, and the other end of which is the rotation control sleeve.
It is abutted against the annular flange 44 of 36. Furthermore, an annular flange
Corresponding to 44, a high friction member 70 is arranged on the inner surface of the cover wall 58. This high friction member 70 is made of synthetic rubber, synthetic leather,
It can be conveniently formed from cork or the like. A locking member 71 is locked to the shaft member 30 in order to prevent the first boss member 2 from coming off.

Next, the function and effect of the electromagnetically controlled spring clutch mechanism described above will be described with reference to FIG. 1 and FIG.

When the electromagnetic means 48 is deenergized, the rotation control sleeve is operated by the action of the biasing coil spring 66, as shown in FIG.
36 is biased to the right as shown by an arrow 72 (FIG. 1), and its annular flange 44 is elastically pressed against a high friction member 70 arranged on a cover wall 58 which is a fixing member. Therefore, the rotation of the rotation control sleeve 36 is reliably prevented by the frictional force between the annular flange 44 and the high friction member 70, and the toothed pulley 14 is moved to the arrow 42.
Even if the coil spring means 34 is rotated in the direction shown by, the rotational driving force from the toothed pulley 14 is not transmitted to the shaft member 30 (at this time, the toothed pulley 14 and the first boss). Only member 2 is rotated).

When the electromagnetic means 48 is energized while the toothed pulley 14 is rotating in the direction shown by the arrow 42, as shown in FIG.
Rotation control sleeve by magnetic attraction of electromagnetic means 48
36 is moved to the left as indicated by arrow 74 and its annular flange 44
Is separated from the high friction member 70, and the rotation control sleeve 36 becomes rotatable. As a result, the coil spring means 34 is contracted by the frictional force between the first boss member 2 and the coil spring means 34, which rotate integrally with the toothed pulley 14, and the first boss member 2 (particularly the small diameter portion 12). And the second boss member 4 (especially the small diameter portion 2
4) is drivingly connected via the coil spring means 34. Thus, the rotational force from the toothed pulley 14 is transmitted to the shaft member 30 via the first boss member 2, the coil spring means 34 and the second boss member 4, and the shaft member 30 is integrated with the toothed pulley 14. Is rotated in the direction indicated by arrow 42.

When the electromagnetic means 48 is deenergized in the above-mentioned state, the annular flange 44 of the rotation control sleeve 36 is pressed against the high friction member 70 again by the action of the bias coil spring 66, whereby the rotation of the rotation control sleeve 36 is surely performed. Be blocked by. As a result, the coil spring means 34 expands slightly from the contracted state and returns to the original state, and the above-mentioned drive connection between the first boss member 2 and the second boss member 4 is released, and thus the shaft member 30.
Stops rotating.

The spring clutch mechanism of the specific example further has the following features. As shown in FIG. 1, the field 50 of the electromagnetic means 48.
The cover wall 58 functions as an outer housing of the clutch mechanism, and the coil spring means 34, the rotation control sleeve 36, the bias coil spring 66, the high friction member 70, etc. are provided in the space defined by the field 50 and the cover wall 58. Since the main constituent parts are accommodated, it is possible to protect these main constituent parts from dust and the like, and also to ensure sufficient safety.

Although one specific example of the electromagnetically controlled spring clutch mechanism according to the present invention has been described above, the present invention is not limited to this specific example, and various modifications and corrections can be made without departing from the scope of the present invention. is there.

For example ,. In the illustrated example, the high friction member 70 is covered with a wall.
It is provided on the inner surface of 58, but instead of this, the annular flange 44 of the rotation control sleeve 36 (the portion that contacts the cover wall 58)
It may be provided in the.

<Effect of the Invention> In the electromagnetic control spring clutch mechanism according to the present invention, a rotation control sleeve whose one end is locked to the coil spring means is provided so as to be slidable in the axial direction, and at least the rotation control sleeve or the fixed member is provided. A high friction member for preventing rotation of the rotation control sleeve is disposed on one side, and the rotation control is performed by the bias spring means and the electromagnetic means for axially actuating against the biasing action of the bias spring means. Since the contraction of the coil spring means is controlled by controlling the operation of the sleeve to be pressed against the fixed member via the high friction member and released from the fixed member, the urging and de-energizing of the electromagnetic means can be performed. The drive connection and the connection release can be performed substantially simultaneously. Further, in the electromagnetic control spring clutch mechanism according to the present invention, as described above, the rotation control sleeve is arranged so as to be slidable in the axial direction, and is biased by the biasing spring means to the fixed member via the high friction member. Since it has been
It is not necessary to have an armature that is actuated and controlled by electromagnetic means in order to prevent the rotation of the rotation control sleeve from being rotated, unlike the conventional one, and therefore, the number of parts can be reduced and the structure is simple and compact. Can be configured. Such an electromagnetically controlled spring clutch mechanism can be conveniently applied to a driving mechanism such as a facsimile machine, a laser beam printer, an electrostatic copying machine, etc., which requires miniaturization.

[Brief description of drawings]

FIG. 1 is a sectional view showing a specific example of an electromagnetically controlled spring clutch mechanism according to the present invention in a state where electromagnetic means is deenergized. FIG. 2 is a sectional view showing the electromagnetically controlled spring clutch mechanism of FIG. 1 in a state where the electromagnetic means is biased. 2 …… First boss member 4 …… Second boss member 14 …… Toothed pulley (input rotation element) 30 …… Shaft member (output rotation element) 34 …… Coil spring means 36 …… Rotation control sleeve 48 ...... Electromagnetic means 50 …… Field 58 …… Cover wall 66 …… Biased coil spring 70 …… High friction member

Claims (2)

[Scope of utility model registration request] 1. An electromagnetically controlled spring clutch mechanism for selectively transmitting a rotational driving force of an input rotary element to an output rotary element, a first boss member rotating integrally with the input rotary element, and the first boss. A second boss member that is disposed adjacent to the member and that rotates integrally with the output rotary element; and a second boss member that is fitted over the first boss member and the second boss member; Coil spring means for driving connection, a rotation control sleeve which is fitted in the coil spring means and is slidable in the axial direction, and one end of which is locked to the coil spring means, and the rotation control sleeve Alternatively, a high-friction member that is disposed on at least one of the fixing members to prevent the rotation of the rotation control sleeve, and a biasing spring means that presses the rotation control sleeve against the fixing member via the high friction member, Rotation control sleeve Electromagnetic means for axially actuating against the biasing action of the biasing spring means, when the biasing spring means acts to cause the rotation control sleeve to move to the high position. It is pressed against a fixed member via a friction member, which prevents rotation of the rotation control sleeve and thus the coil spring means is not contracted, while the electromagnetic means is energized, The magnetic attraction of the means causes the rotation control sleeve to be axially actuated against the biasing action of the biasing spring means and spaced from the fixed member, thereby rendering the rotation control sleeve rotatable. An electromagnetically controlled spring clutch mechanism, characterized in that the coil spring means is allowed to contract. 2. The electromagnetic means comprises a field having an end wall and a side wall extending in a cylindrical shape from the end wall, and a coil body disposed in the field, and one open end of the field is a fixing member. Is covered by the cover wall that makes up
The high friction member is provided on an inner surface of the cover wall, and the coil spring means, the rotation control sleeve and the bias spring means are housed in a space defined by the field and the cover wall. Electromagnetically controlled spring clutch mechanism.