JP3349969B2 - Electromagnetic clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch for electrically connecting and disconnecting a rotatable shaft and a rotary drive rotatably fitted to the shaft.

[0002]

2. Description of the Related Art Conventionally, as this kind of electromagnetic clutch, there is one structured as shown in FIG. That is, this electromagnetic clutch has a cylindrical first
The fitting body 601 is externally fitted to the shaft 600 so as not to rotate, and a gear 602 is fitted to the other side of the shaft 600 so as to be rotatable with respect to the shaft 600, and is fitted to the first fitting body 601 and the gear 602. The coil spring 603 is fitted over the straddle in a tightened state. This coil spring 603
Is wound in a direction opposite to the rotation direction of the gear 602 when viewed from the gear 602.

An exciting coil 605 having a field member 604 forming a magnetic path disposed on one side of the shaft 600 is externally fitted so that the shaft 600 is rotatable. Tsuba 60 at right end
6 is externally fitted, the left end of the coil spring 603 is locked to the ring member 608 externally fitted to the first fitting body 601 in a detented state,
The right end is locked by the second fitting body 607. Further, the movable plate 609 is externally fitted to the second fitting body 607 so as to be able to approach and separate from the field member 604.

[0004] The movable plate 609 has an engaging hole 610 formed at the upper end thereof and a protruding portion 611 of the field member 604.
And a tension coil spring 612 provided on the outer periphery of the field member 604.
4 is biased in a direction away from it. In addition, a U-shaped locking member having a first locking portion 613 formed at a left position and a second locking portion 614 formed at a right position is formed at a lower end portion of the movable plate 609. 615
Is attached.

[0005] On the left side of the flange 606 of the second fitting body 607, a first stopper 616 that is locked by the first locking portion 613 when the movable plate 609 is located away from the field member 604. A movable plate 609 is formed on the right side of the flange 606 so as to project from the field member 604.
A second stopper 617 is formed so as to be locked by the second locking portion 614 when it is at the position where the magnetic attraction is performed.
The second stopper 617 is formed at a position spaced apart from the first stopper 616 in the circumferential direction.

In the electromagnetic clutch constructed as described above,
When the excitation coil 605 is not energized, the first fitting body 601 and the gear 602 are in a state of being tightened by the coil spring 603, and the gear 602 rotates in the direction in which the coil spring 603 is tightened, so that the torque of the gear 602 is increased. Is transmitted to the shaft 600, and the shaft 600 rotates together with the gear 602. When the shaft 600 rotates by a predetermined angle and comes to the position where the first stopper 616 is locked by the first locking portion 613, the coil spring The tightened state by 603 is released, and the transmission of the rotational force to the shaft 600 of the gear 602 is interrupted. That is, the coil spring 60
3 is wound in the direction opposite to the rotation direction of the gear 602 when viewed from the gear 602, and the first stopper 616 is
13, the rotation of the gear 602 is applied to the coil spring 603 in a state where the rotation of the second fitting body 607 is prevented, so that the coil spring 603 is expanded in the radial direction. Is released.

[0007] When the excitation coil 605 is energized in this state, the movable plate 609 is pulled by the magnetic attraction force formed on the field member 604.
12 is magnetically attracted to the field member 604 against the urging force of the first stopper 616, and the first stopper 616 is released from being locked at the first locking portion 613, so that the first fitting body 601 and the gear 602 are released.
Are tightened by the coil spring 603, and the rotational force of the gear 602 is transmitted to the shaft 600,
The shaft 600 will rotate again. When rotated by a predetermined angle, results second stopper 617 is locked to the second locking portion 61 4, the fastened state of the coil spring 603 is released again, the shaft 6 of the gear 602
The transmission of rotational force to 00 will be interrupted. Thereafter, when the excitation coil 605 is de-energized, the movable plate 609 is separated from the field member 604 by the biasing force of the tension coil spring 612 and the second stopper 61 is moved.
7 is released from the second locking portion 614,
The shaft 600 starts to rotate again together with the gear 602.

[0008]

By the way, in the above-mentioned conventional electromagnetic clutch, the movable plate 609 is supported by the field member 604 with the engaging hole 610 fitted in the projecting portion 611 of the field member 604. Therefore, the engagement hole 610 needs to be formed large so that the movable plate 609 can be easily moved in the axial direction at the time of magnetic attraction and at the time of attraction release. Therefore, the movable plate 609 can be easily moved in the radial direction by an amount corresponding to the play of the engagement hole 610 with respect to the protrusion 611, for example, as shown in FIG.
As shown in FIG.
04 when the coil spring 61 is apart from the tension coil spring 61
2 and is pulled upward (in the direction of the arrow) by the engaging hole 610.
The inner peripheral surface (the lower side in the figure) of the right side of the right side is in contact with the protruding portion 611.

When the movable plate 609 is magnetically attracted to the field member 604 in this state, the entire inner peripheral surface of the engaging hole 610 comes into contact with the protruding portion 611 as shown in FIG. Even if the magnetic attraction is released, the engagement hole 6
The movable plate 609 is moved only by the urging force of the tension coil spring 612 due to the frictional force at 10.
And the operation of the movable plate 609 is delayed.

For this reason, if the rotation speed of the gear 602 is, for example, about 150 to 200 rotations / minute, the operation delay does not cause a serious problem.
At a high speed of about rotations / minute, even a slight operation delay causes a large proportion of the time required for one rotation of the gear 602 to have a large effect on a series of operations. For example, it is conceivable to use the electromagnetic clutch configured as described above for a punching device in a post-processing device of a copying machine. In this case, the gear 602 is given a high-speed rotation of about 500 to 600 rotations / minute. When a predetermined punching operation is performed, the movable plate 6
Operation 09 causes a delay in operation of the electromagnetic clutch 10 and causes a problem that punching cannot be performed at a predetermined position of the sequentially conveyed paper.

The present invention has been made in view of such circumstances, and has as its object to provide an electromagnetic clutch which has a simple configuration and does not cause an operation delay.

[0012]

In order to achieve the above object, the present invention according to a first aspect of the present invention provides a shaft, an exciting coil having a shaft rotatably fitted therein and having a field member disposed therein. A rotary drive body rotatably fitted to the shaft, a transmission means for transmitting the rotational force of the rotary drive body to the shaft, and magnetically attracted to the field member when energizing the excitation coil; A movable plate that disconnects the transmitting operation of the transmitting means by a contacting / separating operation with respect to the field member separated from the field member by a biasing unit when power is not supplied, and disposing the movable plate along a surface direction of the movable plate. And a supporting member that is movably supported via a shaft serving as a rotation center , the transmission unit being configured to be non-rotatably mounted on the shaft.
A first fitting body externally fitted, and the first fitting body and the rotation drive
It is fitted over the body in a tightened state and one end is
The rotation direction of the rotary driving body is locked by the first fitting body.
Coil spring wound in the opposite direction to the coil spring, and the coil spring
And the other end of the coil spring is engaged.
And a second fitting body to be stopped, wherein the second fitting body is
A flange having a stopper formed to project along the axial direction
With the movable plate corresponding to the contact / separation operation
And a locking portion for locking the stopper.
The first stopper and the first stopper formed on one surface of the collar portion
On the other surface of the collar portion, circumferentially separated from the first stopper
And a second stopper formed by
A first locking portion for locking the first stopper and the second locking portion;
And a second locking portion where the stopper is locked.
When the coil is energized, the first stopper is locked by the first locking portion.
And when the excitation coil is not energized, the second stopper
It is characterized by being locked by the locking portion .

According to this configuration, the movable plate is
Via a shaft that is arranged along the surface and is the center of rotation
Because it is supported by the support member, it swings around the shaft.
Will move. For this reason,
Contact and separation operations can be performed smoothly without delay.
And In addition, the rotation of the rotation driver given from the outside
Force is applied to the shaft via a coil spring
When the excitation coil is energized and de-energized,
Of the movable plate on the field member
The stopper is locked to the locking part of the movable plate
This releases the tightened state of the coil spring.
For this reason, the transmission of the rotational force of the rotary driver to the shaft is ensured.
It is actually released. When the excitation coil is energized,
The shaft has the first stopper with the rotary drive and the first locking part.
It is rotated until it is locked, and when the excitation coil is not energized
The shaft has a second stopper together with the rotary driving body.
It is rotated until it stops at the stop. Because of this, the shaft
Rotation of the rotary drive relative to its shaft during one revolution
The transmission of the rolling force can be interrupted a plurality of times .

According to a second aspect of the present invention, in the first aspect, the support member is provided in the field portion.
Material and fixed for a predetermined distance in the axial direction of the shaft.
It consists of a pair of arms that are arranged facing each other at a distance,
The shaft body is supported by the pair of arms .

According to this configuration, the movable plate can be
Supported by a pair of arms fixed to the
Swing about the shaft. For this reason, the movable plate
The smooth movement of contact and separation to the field member
Become .

According to a third aspect of the present invention, in the second aspect, the shaft is fixed to the movable plate.
And supported by the support member via a bearing member.
It is characterized by being.

According to this structure, the movable plate is
Through the bearing member to the support member fixed to the
Centered on the shaft fixed to the movable plate supported by
Rocks. For this reason, the movable plate is
The contact and separation operation to the material is performed smoothly and reliably.
You .

According to a fourth aspect of the present invention, a shaft
And the shaft is rotatably fitted in the shaft.
An excitation coil having a magnetic member disposed thereon, and the shaft
A rotary drive that is rotatably fitted to the outer periphery of the rotary drive;
Transmitting means for transmitting a rotational force to the shaft;
When the coil is energized, it is magnetically attracted to the field member.
When the power is turned off, the urging means
To the field member separated from the material
A movable plate for cutting off the transmission operation of the transmission means
And moving the movable plate along the surface direction of the movable plate.
Can be moved in and out via a shaft that is the center of rotation
And a support member for supporting the support member, wherein the support member is
And the shaft of the shaft is fixed to the field member.
Pairs of arms that are arranged facing each other at a predetermined interval in the direction
Wherein the shaft is supported by the pair of arms.
It is characterized in that that.

According to this structure, the time given from the outside is
The rotational force of the rolling drive is transmitted to the shaft via the transmission means.
While the excitation coil is energized and de-energized
By moving the movable plate to and from the field member
The transmission operation of the transmission means is cut off. The movable plate
Through a shaft, which is arranged along the surface direction of the
Around the shaft because it is supported by a pair of arms
Swings, and moves toward and away from the field member.
The operation is performed smoothly without delay
Become .

According to a fifth aspect of the present invention, in the fourth aspect, the shaft is fixed to the movable plate and supported by the support member via a bearing member. It is characterized by.

According to this configuration, the movable plate swings about the shaft fixed to the movable plate supported by the support member fixed to the field member via the bearing member. This allows the movable plate to smoothly and reliably perform the operation of moving toward and away from the field member.

The invention according to claim 6 is the invention according to claim 4 or
The transmission according to claim 5, wherein the transmission means is the shuffling device.
A first fitting body non-rotatably fitted on the first fitting, and the first fitting body
And is fitted over the rotary drive in a tightened state.
At the same time, one end is locked by the first fitting body,
Coil spring wound in the direction opposite to the rotating direction of the moving body
And the coil spring is loosely fitted around the outer periphery of the coil spring.
A second fitting body to which the other end of the spring is locked,
The second fitting body has a storage member formed to protrude along the axial direction.
The movable plate has a flange portion having a
The stopper is provided to lock the stopper in accordance with the operation.
It is characterized by:

According to this configuration, the time given from the outside
The rotational force of the rolling drive is applied via a coil spring in a tightened state.
When the excitation coil is energized while being transmitted to the shaft
And the field member of the movable plate when not energized
The stopper moves the movable plate in accordance with the
Tightened state of coil spring by being locked to stop
Is released. For this reason, the rotational force of the rotary
Transmission to the client is securely released.

[0024]

FIG. 1 is a diagram showing a schematic configuration of a punching device (sheet punching device) in a post-processing device such as a copying machine to which an electromagnetic clutch according to an embodiment of the present invention is applied. That is, the punching device 1 includes an electromagnetic clutch 10 according to the present invention, and a punching mechanism unit 50 that is driven by the electromagnetic clutch 10 and punches a predetermined position of the sheet P conveyed in the direction of the arrow by a conveying unit (not shown).
And

FIG. 2 is a sectional view of the electromagnetic clutch 10, and FIG. 3 is an exploded perspective view thereof. In these figures, the electromagnetic clutch 10 includes a shaft 12 and a shaft 1.
2 is a left-side excitation coil unit 14 fitted inside so as to be rotatable, and a right-side rotational driving body fitted outside to the shaft 12 so as to be rotatable around the shaft 12. A gear 16, a transmission unit 18 for transmitting the rotational force of the gear 16 to the shaft 12, and a movable plate 20 for connecting / disconnecting (intermittently) the transmitting operation of the rotational force by the transmission unit 18 are provided.

The shaft 12 is formed, for example, by molding and sintering magnetic material powder, and has a through hole 121 formed in the axial direction. This through-hole 121 is
For example, a punching mechanism section in which a flat protrusion 122 is formed between a right end and a central portion so that an inner diameter portion has a vertical cross-sectional D-shape, and a front end portion has a vertical cross-sectional D-shape. A drive shaft 51 described later of 50 is inserted. As a result, the drive shaft 51 is
The rotation of the shaft 12 is accurately transmitted to the drive shaft 51. Note that it is also possible to configure the electromagnetic clutch 10 by fitting the exciting coil portion 14, the gear 16, and the like to a part of the drive shaft 51. In this case, the part of the drive shaft 51 is Shaft 12 is also used.

The exciting coil portion 14 includes a bearing 21 which also serves as a field member rotatably fitted to the shaft 12 via a first fitting body 30 described later, and an exciting coil fitted to the bearing 21 in a fixed state. 22, a first field member 24 disposed to the left of the exciting coil 22 and fixed to the left end of the bearing 21; and a first field member 24 disposed to the right of the exciting coil 22 and attached to the first field member 24. And the second field member 26 provided. The bearing 21, the first
The field member 24 and the second field member 26 are each made of a magnetic material such as an iron-based metal.
A magnetic path is formed to pass a magnetic flux generated when power is supplied to the power supply.

The bearing 21 is provided on an outer fitting portion 211 for the first fitting body 30 described later, and is provided continuously to the right of the outer fitting portion 211.
It has a storage part 212 in which a part of the transmission means 18 is stored, and a mounting part 213 which is provided continuously to the left of the external fitting part 211 and in which the first field member 24 is externally fitted. Excitation coil 2
Reference numeral 2 denotes a configuration in which a wire is wound around an annular flanged bobbin 221, and a lead wire 222 is drawn out from a notch formed in the first field member 24.

The first field member 24 includes the exciting coil 2
2, an annular flat plate portion 242 having a through hole 241 having a diameter substantially the same as the outer diameter of the mounting portion 213 of the bearing 21 at the center;
A lower extending portion 243 extending to the outer peripheral surface of the exciting coil 22 bent at the lower end of the flat plate portion 242;
And an upper extending portion 244 extending to the outer peripheral surface of the exciting coil 22 bent at the upper end of the upper portion. A fitting recess 245 into which a fitting protrusion 265 described later of the second field member 26 is fitted is formed at the center of the edge of the lower extension 243. Is formed with a fitting protrusion 246 to be fitted into a fitting recess 266 described later of the second field member 26. In addition, a hook portion 247 for hanging an end of a tension coil spring 40 described later is formed in a bent shape in the upper extension portion 244.

The second field member 26 includes the exciting coil 2
2, an annular flat plate portion 262 having a through hole 261 in the center larger than the outer diameter of the storage portion 212 of the bearing 21.
And a lower mounting portion 263 extended at a lower end of the flat plate portion 262.
And an upper mounting portion 264 extending from the upper end of the flat plate portion 262. Also, at the center of the edge of the lower mounting portion 263,
A fitting convex portion 265 to be fitted into the fitting concave portion 245 of the first field member 24 is formed, and a fitting convex portion 246 of the first field member 24 is fitted to a center of an edge of the upper mounting portion 264. Fitting recess 266 is formed.

In this configuration, the second field member 2
6 is fitted into the fitting recess 245 of the first field member 24 and the first field member 24
When the fitting projection 246 of the bearing 21 is fitted into the fitting recess 266 of the second field member 26 and the second field member 26 is attached to the first field member 24, the storage portion 212 of the bearing 21 and the second field member 26 An annular gap G is formed between the flat plate portions 262. Thereby, when the excitation coil 14 is energized, the flat plate portion 26 of the second field member 26 is
2 generates a magnetic attraction force on the movable plate 20.

The flat portion 2 of the first field member 24
A support member 28 for supporting the movable plate 20 is attached to the upper end of the reference numeral 42. The support member 28 includes a mounting portion 281 to be attached to the flat plate portion 242, and a pair of left and right arms 282 and 283 which are bent at both right and left ends of the mounting portion 281 and are arranged to face each other at a predetermined interval. Further, mounting holes 284 and 285 are formed at the distal ends of the arms 282 and 283, and a part of the mounting holes 284 and 285 are opened outward.
6,287 are fitted. These bearing members 286 and 287 are made of a synthetic resin or the like, and the flat plate portions 28 abutting on the outer surfaces of the arms 282 and 283 are provided.
9, 290 and fitting portions 291 and 292 fitted into the respective mounting holes 284 and 285.
3,294 are formed.

The gear 16 includes a gear portion 161 to which an external gear (not shown) is meshed, and a cylindrical portion 162 connected to the left side of the gear portion 161. The inner peripheral surface of the gear 16 smoothly rotates with respect to the shaft 12. A friction reducing member, such as a copper-based oil-impregnated sintered alloy, is provided. The cylindrical portion 162 includes a gear portion 161.
The first cylindrical portion 163 having a smaller diameter than the gear portion 161 adjacent to the first cylindrical portion 163
And a second cylindrical portion 164 having a smaller diameter than the first cylindrical portion 163 adjacent to the first cylindrical portion 163.

The transmission means 18 includes a gear 16
The first cylindrical portion 30 having the same diameter as the second cylindrical portion 164 of the gear 16 adjacent to the gear 16 and being non-rotatably fitted adjacent to the gear 16.
1. First cylinder portion 301 provided to the left of first cylinder portion 301
The second cylindrical portion 302 having a smaller diameter than the second cylindrical portion 302 and the third cylindrical portion 30 having a smaller diameter than the second cylindrical portion 302 provided to the left of the second cylindrical portion 302.
3 and a first fitting body (output hub) 30 having the same axial length as the second tubular part 302, while being externally fitted to the second tubular part 302 of the first fitting body 30 in a detented state. And the first cylindrical portion 30 adjacent to the first cylindrical portion 301 of the first fitting body 30
First ring portion 321 and first ring portion 3 having a diameter larger than 1
A ring body (adjust ring) 32 having a second ring portion 322 smaller in diameter than the first ring portion 321 continuously provided to the left of the second 21, the second cylindrical portion 164 of the gear 16, and the first fitting body 30. The coil spring 34 is fitted over the one cylindrical portion 301, and a cylindrical second fitting body 36 fitted (fitted) so as to cover the coil spring 34.

A plurality of teeth 304 are formed on the outer peripheral surface of the second cylindrical portion 302 of the first fitting body 30 at a predetermined pitch, and a ring groove 305 is formed on the outer peripheral surface of an end of the third cylindrical portion 303. ing. A plurality of teeth 323 meshing with teeth 304 formed on the second cylindrical portion 302 of the first fitting body 30 are formed on an inner peripheral surface of the ring body 32, and a coil is formed on an outer peripheral edge of the first ring part 321. A fitting groove 324 into which a left bent end 341 described later of the spring 34 is fitted is formed.

With this configuration, the plurality of teeth 323 on the inner peripheral surface of the ring body 32 are prevented from rotating around the second cylindrical portion 302 by being engaged with the teeth 304 of the second cylindrical portion 302. And a part of the first fitting body 30. In addition, the bearing 21 is mounted adjacent to the ring body 32, and the retaining ring 38 fitted in the ring groove 305.
As a result, it is impossible to pull out from the first fitting body 30.

The inner diameter of the coil spring 34 is the second
It is configured to be smaller than the outer diameter of the cylindrical portion 164 and the first cylindrical portion 301 of the first fitting body 30 by a predetermined dimension, and is opposite to the rotation direction of the gear 16 when viewed from the gear 16 (in this embodiment, , The right end as viewed from the gear 16), and the left end 341 is bent so as to extend in the axial direction, and the right end 342 extends radially outward. It is bent. As a result, the coil spring 34 is fitted around the second tubular portion 164 of the gear 16 and the first tubular portion 301 of the first fitting body 30 in a state of being tightened, and the left end 341 of the ring body 32 is The right end 342 is fitted in the fitting groove 324 and the second fitting body 3
6 to be described later.

The second fitting body 36 has a large-diameter flange 361 on the gear 16 side and a flange 361 connected to the left of the flange 361.
A first cylindrical portion 362 having a smaller diameter than the first cylindrical portion 362 and a second cylindrical portion 36 having a smaller diameter than the first cylindrical portion 362 provided to the left of the first cylindrical portion 362.
3 is provided. The inner diameter of the flange 361 is the gear 16
Of the ring body 32 on the left end surface of the second cylindrical portion 363.
A concave portion 364 into which the ring portion 321 is fitted is formed. In addition, a part of the flange portion 361 and a part of the first cylindrical portion 362 communicate with the inner diameter side and the outer diameter side, and the right end 34 of the coil spring 34 is formed.
2 is formed with a fitting groove 365 into which the fitting groove 2 is fitted.

The flange 361 has a first stopper 366 and a second stopper
7 is formed so as to protrude in the axial direction. That is, as shown in FIG. 3, the first stopper 366 defines a reference position for the rotational operation of the shaft 12, and is formed on the left side of the flange 361, and the second stopper 367 is formed on the right side of the flange 361. The first stopper 366 is formed at a predetermined angle (45 degrees in the present embodiment) on the downstream side in the rotation direction from the first stopper 366.

The movable plate 20 includes a flat plate portion 202 having a through hole 201 larger than the outer diameter of the second cylindrical portion 363 of the second fitting body 36, and a mounting portion 203 integrally formed above the flat plate portion 202. And a pair of shafts 20 fixedly protruded outward from each other at the left and right ends of the mounting portion 203.
4, 205, and a locking member 206 attached to a lower portion of the flat plate portion 202. In addition, a hook portion 213 is formed in the upper center of the attachment portion 203 so as to bend the end portion of a tension coil spring 40 described later.

The shafts 204 and 205 are made of synthetic resin or the like. The large diameter portions 207 and 208 attached to the attachment portion 203 with an adhesive or the like and the small diameter portions 20 protruding outward.
9 and 210, and are arranged on the same axis along the surface direction of the flat plate portion 202. In addition, the small diameter portion 209,
Ring grooves 211 and 212 for fitting a retaining ring are formed on the outer peripheral surface of the distal end of 210.

The locking member 206 is made of a synthetic resin or the like and is attached to the lower portion of the flat plate portion 202 with an adhesive or the like. The first stopper 3 of the flange portion 361 when separated (when the excitation coil 22 is de-energized)
The first locking portion 207 formed of an upright wall on which the 66 is locked is separated from the first locking portion 207 along the axial direction of the shaft 12, and the movable plate 20 is magnetically attracted to the second field member 26. A U-shaped opening which is provided with a second locking portion 208 comprising a standing wall at which the second stopper 367 of the flange portion 361 is locked when the excitation coil 22 is energized. It is.

The movable plate 20 thus configured
Are the through holes 293, 2 of the bearing members 286, 287 in which the small diameter portions 209, 210 of the shafts 204, 205 are fitted into the mounting holes 284, 285 of the pair of arms 282, 283.
94, and is supported so as to be able to swing (rotate) around each of the shafts 204 and 205 as a rotation center. As described above, the movable plate 20 is attached to the pair of arms 282 and 283 by the shaft 2.
Since the movable plate 20 is supported via the shafts 04 and 205, the movable plate 20 is smoothly swung about the shafts 204 and 205. The hook 2 of the movable plate 20
13 and the hook portion 247 of the first field member 24, both ends of the tension coil spring 40 are hooked, and as a result of the mounting portion 203 of the movable plate 20 being pulled toward the exciting coil portion 14, the flat plate portion 202 is It will be separated from the second field member 26.

In order to swingably support the movable plate 20 on the arms 282 and 283 of the support member 28, for example, each of the shafts 204,
The small diameter portions 209 and 210 of the arm 205 are connected to the arms 282 and 283
After being disposed in the mounting holes 284 and 285 of the
The bearing members 286 and 287 are inserted into the mounting holes 284 and 285 from the outside of the small diameter portions 20
9 and 210 are inserted into the through holes 293 and 294 so as to be fitted. Then, the small diameter parts 209, 21
0, the retaining rings 214 and 215 are fitted into the ring grooves 211 and 212, and the bearing members 286 and 287
Do not get out of 10.

The electromagnetic clutch 10 configured as described above
When the excitation coil 22 is not energized, the movable plate 20 is separated from the second field member 26 by the urging force of the tension coil spring 40, and the locking member 206 of the movable plate 20 is moved to the first stopper 366 of the second fitting body 36. , The rotational force (in this embodiment, clockwise rotation as viewed from the gear portion 161 side of the gear 16) is applied to the gear 16, and the first rotation is performed immediately after the shaft 12 rotates. The stopper 366 is engaged with the upright wall 207 of the locking member 206, and the rotation of the shaft 12 is stopped. This stop position is a reference position for the rotation of the shaft 12.

That is, when the first stopper 366 is engaged with the locking member 206, the second fitting body 36 cannot rotate, and the coil spring 34 is fixed to the left end 341 with the right end 342 side fixed. As a result, the rotational force is transmitted to the side, so that the coil spring 34 is expanded in the radial direction to release the tightened state with respect to the first fitting body 30 and the gear 16, and the rotational force of the gear 16 is applied to the shaft 12. Will not be transmitted.

When the exciting coil 22 is energized in this state, the movable plate 20 is moved to the second field member 26.
Magnetically attracted to the locking member 206 of the first stopper 366.
Is disengaged from the first fitting body 30 and the gear 1
6 is again tightened by the coil spring 34 and the shaft 12 starts to rotate again. However, when the shaft 12 rotates by a predetermined angle (45 degrees in the present embodiment), the second stopper 367 is attached to the upright wall 208 of the locking member 206. After engagement, the tightened state of the coil spring 34 is released, and the rotation of the shaft 12 is stopped again. When energization of the excitation coil 22 is interrupted in this state, the movable plate 20 separates from the second field member 36, and the locking member 2 of the second stopper 367
As a result, the first fitting body 30 and the gear 16 are tightened by the coil spring 34, and the shaft 12 starts rotating again. However, when the shaft 12 rotates by a predetermined angle (315 degrees in the present embodiment). The first stopper 366 engages with the upright wall 207 of the locking member 206, and the rotation of the shaft 12 is stopped again.

In the operation of moving the movable plate 20 toward and away from the first field member 36, the movable plate 20 is moved by the pair of shafts 204 and 205 into the bearing member 28.
The movable plate 20 is quickly separated from the second field member 26 even when the power supply to the exciting coil 22 is cut off, since the movable plate 20 is swingably supported by the support member 28 via the second and sixth members 287. Therefore, the operation delay of the electromagnetic clutch 10 does not occur.

Returning to FIG. 1, the punching mechanism 50 includes a drive shaft 51 inserted through the through hole 121 of the shaft 12 of the electromagnetic clutch 10 and a plurality of first cams 52 ( For convenience, only one is shown), a plurality of second cams 53 (only one is shown for convenience) attached at positions separated from the first cam 52 of the drive shaft 51, and are vertically moved by the first cam 52. , A paper stopper 54 rotatably attached to the support shaft 541 and a second cam 53 to move up and down.
51 is provided with a punch portion 55 rotatably attached to 51.

The first cam 52 has a shape having a concave portion 521 formed at a part of the peripheral surface of a perfect circle so as to have a central angle of approximately 45 degrees. Further, the paper stopper 54 is urged upward by an unillustrated urging means, and the upper end of the paper stopper 54 is the first cam 5.
2 and attached to the support shaft 541. When the upper end is in contact with the cam peripheral surface in the concave portion 521 of the first cam 52, the paper P can pass therethrough,
In a state where the sheet P is in contact with the outer peripheral surface of the cam outside the concave portion 521, the lower end portion prevents the paper P from passing therethrough.

The second cam 53 raises the punch 55 on the peripheral surface of the cam closest to the drive shaft 51, and lowers the punch 55 on the peripheral surface of the cam furthest from the drive shaft 51 to punch the sheet P. It has a shape that allows it. Further, the punch portion 55 has a punch blade 55
2 and is attached to the support shaft 551 in a state of being urged upward by an unillustrated urging means.

In the punching apparatus 1 configured as described above, when the copying machine or the like is in operation, the electromagnetic clutch 10
Gear 16 is always rotated in the direction of the arrow by the application of rotational force from the outside. When the sheet P has not reached the predetermined position before the punching mechanism 50,
The first stopper 366 of the electromagnetic clutch 10 is
07 and the shaft 12 (that is, the drive shaft 51) is in a stopped state. In this state, the concave portion 521 of the first cam 52 is at the lower position, and the paper stopper 54 is in contact with the cam peripheral surface in the concave portion 521. The portion of the second cam 53 closest to the drive shaft 51 is at the lower position, and the punch portion 55 is at the raised position.

In this state, the sheet P is fed to the punching mechanism 5
0, the excitation coil 22 of the electromagnetic clutch 10 is energized, the movable plate 20 is magnetically attracted, and the locked state of the first stopper 366 with the first locking portion 207 is released. 12 (that is, the drive shaft 51) rotates. This rotation is continued until the second stopper 367 is locked by the second locking portion 208 (that is, 45 degrees), and the second stopper 367 is locked by the second locking portion 208. Drive shaft 51
Is stopped. At this time, the paper stopper 54
The sheet P is detached from the recess 521 of the first cam 52 and is lowered to a position where the leading end of the sheet P contacts. The punch 55
Is still in the raised position at this point.

When the paper stopper 54 is lowered, the paper P is conveyed to a position where the leading end of the paper P contacts the paper stopper 54. At this time, the power supply to the exciting coil 22 is cut off. As a result, the second stopper 367
The locked state of the locking portion 208 is released, and the drive shaft 51 is rotated again. This rotation is performed by the first stopper 3
66 is continued until it is locked by the first locking portion 207 again (that is, 315 degrees). During this time, the paper stopper 54 remains lowered, and the paper P continues to be conveyed even after the leading edge of the paper P comes into contact with the paper stopper 54, so that the leading edge portion is slightly bent.

In this state, the punch 55 is moved down by the second cam 53 to punch the sheet P at a predetermined position. Thereafter, the punch 55 rises and returns to the original position.
When the first stopper 366 is locked by the first locking portion 207 and the rotation of the drive shaft 51 is stopped, the paper stopper 54 comes into contact with the cam peripheral surface in the concave portion 521 of the first cam 52. When the sheet stopper 54 rises, the conveyance stop of the sheet P is released, and the perforated sheet P is conveyed vigorously forward due to a recoil of the bending force or the like. Thus, the shaft 12 of the electromagnetic clutch 10
Each time the drive shaft 51 makes one rotation, the paper P conveyed from the upstream side is punched.

Since the movable plate 20 is supported by the support member 28 via the bearing members 286 and 287 by the shafts 204 and 205, the operation of the electromagnetic clutch 10 according to the present invention is delayed with a simple configuration. Can be prevented, and even if the gear 16 is rotated at a high speed of about 500 to 600 revolutions / minute, the predetermined punching operation is performed accurately. Perforation can be performed accurately at the position.

That is, if the conventional operation delay occurs when the movable plate 20 of the electromagnetic clutch 10 separates from the second shield member 26 in particular, the rotation start timing of the drive shaft 51 is delayed.
Not only does the sheet P locked by the sheet P bend unnecessarily, and the punching is not performed at an accurate position, but also the timing of releasing the stop of the conveyance by the sheet stopper 54 is delayed, and the next sheet conveyed subsequently Since the lowering timing of the paper stopper 54 with respect to P is also delayed, a large disturbance occurs in the continuous punching operation for the paper P continuously transported.

The disadvantage is that the transmission of the rotational force of the gear 16 is interrupted a plurality of times during one rotation of the drive shaft 51, and for each disconnection operation, another transmission is made according to the rotation of the drive shaft 51. An apparatus for performing the operation (in this embodiment, the operation of lowering the paper stopper 54 and the operation of the punch 5
5, the operation of punching the sheet P) is a particularly serious problem. That is, in an apparatus having a configuration in which another operation (in the present embodiment, an operation of lowering the paper stopper 54 and an operation of punching the paper P by the punch unit 55) is performed by a drive source such as an independent electromagnetic clutch. In some cases, it is possible to take countermeasures by adjusting the operation timing of the drive source in advance in accordance with the expected operation delay, but when performing different operations with the same drive shaft 51 as in the present embodiment, It is difficult to take countermeasures by adjusting the operation timing. On the other hand, in the present embodiment, since the movable plate 20 is supported by the shafts 204 and 205 as described above, the paper
Can be accurately drilled at a predetermined position.

Note that the electromagnetic clutch 10 according to the present invention
The present invention is not limited to the configuration of the above-described embodiment, and various modifications as described below can be adopted.

(1) In the above embodiment, the transmission means 18
Is constituted by the first fitting body 30, the ring body 32, the coil spring 34, and the second fitting body 36, and the rotational force of the gear 16 is different between the case where the coil spring 34 is in the tightened state and the case where the tightened state is released. I try to cut off the communication,
The transmission means for transmitting the rotational force of the gear 16 to the shaft 12 may be, for example, a magnetic attraction to a field member of an armature (magnetic material plate) adapted to rotate together with the gear 16. In short, the present invention can be applied to various configurations as long as the configuration is such that the transmission operation of the transmission means is disconnected by the contact / separation operation by magnetic attraction of the movable plate 20 to the field member. It is.

(2) In the above embodiment, the second fitting 36
The first and second stoppers 366, 36
7 is formed, one stopper may be formed on only one surface of the flange 361 according to the use of the electromagnetic clutch 10, or 3 stoppers may be formed on both surfaces of the flange 361.
It is also possible to form more than two stoppers. When a plurality of stoppers are formed, the transmission of the rotational force of the gear 16 to the shaft 12 can be interrupted a plurality of times while the shaft 12 makes one rotation.

(3) In the above embodiment, the movable plate 2
0 is a shaft 204 attached to the movable plate 20;
205 is the support member 28 via the bearing members 286 and 287
(Arms 282, 283), but directly through the shaft 2 without the intervention of the bearing members 286, 287.
04 and 205 as support members 28 (arms 282 and 283)
The movable plate 20 may be supported so as to be swingable. Further, the shaft members 204 and 205 are
8 (arms 282, 283), the bearing members 286, 287 are attached to the movable plate 20, and the shafts 204, 205 on the support member 28 side are attached to the movable plate 20.
The movable plate 20 is supported by the support members 28 (arms 282 and 283) by being fitted into the bearing members 286 and 287 on the side.
It is also possible to support in a swingable manner.

(4) In the above embodiment, the movable plate 2
0 is supported on the support member 28 by a pair of shafts 204 and 205. For example, one shaft is arranged and fixed in the center of the mounting portion 203 of the movable plate 20 in the left-right direction. It is also possible to provide the support member 28 with a support portion for supporting the shaft body so that the movable plate 20 can swing.

[0064]

As described above, according to the first aspect of the present invention,
Movable plate is separable operatively supported by the support member through the shaft body as a rotation center disposed along a surface direction of the movable plate Rutotomoni, first when power supply to the exciting coil 1
The stopper is locked by the first locking portion, so that no communication with the excitation coil is possible.
The second stopper is locked by the second locking portion when power is applied.
Therefore, it is possible to realize an electromagnetic clutch with a simple configuration that does not cause an operation delay , and that the shaft rotates once.
Transmission of the rotational force of the rotary driver to the shaft during
An electromagnetic clutch that can be connected and disconnected multiple times
Ru can be current.

According to the second aspect of the present invention, the shaft is
Because the arm is supported by a pair of arms, the movable plate
Will be supported in a balanced state,
An electromagnetic clutch that reliably contacts and separates members
Can be realized.

According to the third aspect of the present invention, the shaft body is
Fixed to the moving plate and supported by a support member via a bearing member.
To the field member of the movable plate.
Contact / separation operation is performed smoothly and reliably, and can be operated with a simple configuration.
An electromagnetic clutch with no operation delay can be realized.

According to the fourth aspect of the present invention, the movable press
Circuit board is arranged along the plane of the movable plate.
Since the movable plate is supported by a pair of arms so as to be able to move toward and away from the pair of arms via a shaft serving as a moving center , the movable plate is supported in a balanced state, so that the moving plate can be moved toward and away from the field member. Operation is performed reliably, and operation delays occur with a simple configuration.
It is possible to realize an electromagnetic clutch that does not deflect.

According to the fifth aspect of the present invention, the shaft is fixed to the movable plate and is supported by the support member via the bearing member, so that the movable plate can smoothly contact and separate from the field member. It is possible to realize an electromagnetic clutch that is reliably performed, has a simple configuration, and does not cause an operation delay.

Further , according to the invention of claim 6, the transmission means
Have a first fitting, a coil spring, and a second fitting.
The second fitting body has a stopper formed to protrude along the axial direction.
Equipped with a flange that has a pa
The stopper is provided to lock the stopper.
The rotational force of the rotary driver given from the part is tightened
While being transmitted to the shaft through a coil spring,
Supports the movement of the moving plate to and from the field member.
The stopper is locked by the locking part, and the coil spring is tightened.
The mounting state is released, and the shaft of the rotational force of the rotary drive
To realize an electromagnetic clutch in which transmission to the
Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a punching device to which an electromagnetic clutch according to an embodiment of the present invention is applied.

FIG. 2 is a sectional view of the electromagnetic clutch shown in FIG.

FIG. 3 is an exploded perspective view of the electromagnetic clutch shown in FIG.

FIG. 4 is a view for explaining a configuration of a stopper formed on a second fitting body used in the electromagnetic clutch shown in FIG. 2;

FIG. 5 is a sectional view of a conventional electromagnetic clutch.

FIG. 6 is a view for explaining a problem of the conventional electromagnetic clutch shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punching apparatus 10 Electromagnetic clutch 12 Shaft 14 Exciting coil part 16 Gear (rotary driving body) 18 Transmission means 20 Movable plate 21 Bearing 24 First field member (Field member) 26 Second field member (Field member) 28 Support member 30 First 1 fitting body 34 coil spring 36 second fitting body 40 tension coil spring (biasing means) 50 punching mechanism section 204, 205 shaft body 206 locking member (locking section) 207 first locking section 208 second locking section 282,283 Arm 286,287 Bearing member 366 First stopper 367 Second stopper

Claims (6)

(57) [Claims] A shaft and a rotatable interior of the shaft.
Excitation with fitting and field members arranged
A coil, and a rotary drive rotatably fitted to the shaft.
A moving body and transmitting a rotational force of the rotary driving body to the shaft;
Transmission means for transmitting the electric current to the exciting coil.
Biasing means when magnetically attracted to the
The field separated from the field member by
The transmission operation of the transmission means is performed by the contact / separation operation of the member
A movable plate to be disconnected and connected to the movable plate;
A shaft that is arranged along the plane of the rate and is the center of rotation
And a supporting member for supporting the contacting / separating operation via the shaft , wherein the transmitting means is non-rotatably fitted to the shaft.
Straddling the first fitting body and the first fitting body and the rotary driving body;
And the other end is fitted with the first fitting.
Locked in a union, in the direction opposite to the rotation direction of the rotary drive
A coil spring wound around the coil spring;
The other end of the coil spring is locked
A second fitting body, and the second fitting body extends along the axial direction.
And a flange having a stopper formed so as to protrude.
In addition, the movable plate moves in response to the contact / separation operation.
A stopper that locks the topper, wherein the stopper is formed on a first stopper formed on one surface of the flange portion and on the other surface of the flange portion so as to be circumferentially separated from the first stopper; And the locking portion has a first locking portion for locking the first stopper and a second locking portion for locking the second stopper.
The first stopper is locked to the first locking portion when the excitation coil is energized, and the second stopper is locked to the second locking portion when the excitation coil is not energized. You
That electric magnetic clutch. 2. The support member includes a pair of arms fixed to the field member and arranged to face each other at a predetermined interval in an axial direction of the shaft, and the shaft body is attached to the pair of arms. claim 1 Symbol placement of the electromagnetic clutch, characterized in that it is supported. 3. The electromagnetic clutch according to claim 2 , wherein the shaft body is fixed to the movable plate and is supported by the support member via a bearing member. 4. A shaft and a rotatable interior of the shaft.
Excitation with fitting and field members arranged
A coil, and a rotary drive rotatably fitted to the shaft.
A moving body and transmitting a rotational force of the rotary driving body to the shaft;
Transmission means for transmitting the electric current to the exciting coil.
Biasing means when magnetically attracted to the
The field separated from the field member by
The transmission operation of the transmission means is performed by the contact / separation operation of the member
A movable plate to be disconnected and connected to the movable plate;
A shaft that is arranged along the plane of the rate and is the center of rotation
And a support member for supporting the contact and separation operation through the support member, wherein the support member is fixed to the field member, and is formed of a pair of arms that are opposed to each other at a predetermined interval in the axial direction of the shaft. becomes, the shaft body you characterized electrostatic magnetic clutch that is supported by the pair of arms. 5. The electromagnetic clutch according to claim 4, wherein the shaft is fixed to the movable plate and is supported by the support member via a bearing member. 6. The transmission means does not rotate the shaft.
A first fitting body externally fitted with the first fitting, and the first fitting body and the rotation
It is externally fitted in a tightened state across the driver and
The end is locked to the first fitting body, and the rotation of the rotary driving body is rotated.
Coil wound in a direction opposite to the direction, and the coil
The other end of the coil spring is loosely fitted around the outer periphery of the spring.
And a second fitting body on which the second fitting is locked.
The body has a flange formed with a stopper protruding along the axial direction.
Part, wherein the movable plate corresponds to the contact / separation operation.
A stopper for locking the stopper is provided.
The electromagnetic clutch according to claim 4 or 5, wherein