JPS61140623A - Electromagnetic coupling device - Google Patents

Abstract

PURPOSE:To obtain a compact and light device by interposing a normal turn electromagnetic clutch between a loosely fit input rotary member and a fixed member on an intermediate shaft, and an inverse turn electromagnetic clutch between a fixed member and a loosely fit member on an output shaft respectively. CONSTITUTION:A sprocket 51, a gear 46 and a disc member 52 are loosely fit to an input shaft 45 as an integral input member, and a normal turn electromagnetic clutch 54 is interposed between the disc member 52 and a disc 53 injected to be fixed to the input shaft 45 as a fixed member. And the rotation of the intermediate shaft 45 is transmitted to an output shaft 44 through a normal turn transmission mechanism 63 as normal turn of the same direction of the intermediate shaft 45. And the rotation of the input rotary member is transmitted to a loosely fit member on the output shaft 44 through an inverse turn transmission mechanism 69 as inverse rotation. And a gear 70 as a loosely fit member and an inverse turn electromagnetic clutch 71 breaking and connecting rotation transmission with the output shaft 44 are provided on the output shaft 44.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electromagnetic coupling device that combines an electromagnetic clutch and a group of gears, and transmits the rotation of a driving member to a driven member as rotation in forward and reverse directions. be.

[Conventional technology]

In recent years, with the improvement in the quality and performance of electromagnetic clutches,
A magnet electromagnetic coupling device, which combines a plurality of electromagnetic clutches and a group of gears, has been developed and is now widely used in computer peripherals, copying machines, facsimile machines, and the like.

Fig. 4 is a partially cutaway front view of this type of electromagnetic coupling device disclosed in Japanese Patent Application Laid-open No. 56-35846. The fixed plates 1 and 2 are fixedly provided, and this fixed plate 1.2
The electromagnetic clutch/brake 3, 4.5.8 with the same configuration
is fixed.

Each electromagnetic clutch/brake 3, 4, 5, 8 has a fixed plate 1
．． An annular stator 7 fixed to the stator 2, an electromagnetic coil 8 supported in the annular groove, and a disc-shaped magnet fitted to the stator 7 via a pole bearing 9 and facing the electromagnetic coil 8. - rotor 10 and an annular armature 11 disposed with a predetermined gap between the rotor 10 and the rotor 10. However, only in the electromagnetic brake 4, an annular stop plate 13 is fixed to the inner peripheral surface of the stator 1 on the rotor 100, and the ball bearing 8 has external teeth 14a and internal teeth 14b on the outer periphery. An internal gear 14 having a diameter is fitted therein. Reference numeral 15 designates an input shaft that is drivingly connected to a drive unit (not shown), and the rotor 10 of the electromagnetic clutch 5.6 is fitted onto this input shaft 15 and fixed. Further, the armature 11 of the electromagnetic clutch 5.6 is supported so as to be freely movable in the axial direction on the outer periphery of a sprocket 18 and a gear 19 which are loosely mounted on the input shaft 1s via a metal 16.17. Further, a sprocket 20 is fixed to a protrusion of the input shaft 15 from the fixed plate 1. on the other hand,
An intermediate shaft 21 is connected to the rotor 10 of the electromagnetic clutch 3 and the internal gear 14 on the electromagnetic brake 4 side with a ball bearing 2.
2, and the fixed plate 1 of this intermediate shaft 21
．． The protrusion from 2 includes a sprocket 23 fixed to the rotor 10 and an output hub 24 fixed to the internal gear 14.
and are freely rotatably mounted via ball bearings 25 and 28, respectively. Further, the electromagnetic clutch 3. The armature 11 of the electromagnetic brake 4 is supported by a hub 27 fixed to the intermediate shaft 21 and the internal gear 14 so as to be movable in the axial direction. 28 is a tin rocket supported by the intermediate shaft 21 via a one-way clutch 28, and the outer circumferential portion thereof is divided into equal parts in the circumferential direction.
A plurality of planetary gears 30 are pivotally connected by pins 31, and each planetary gear 30 is meshed with a sun gear 32 integrally fixed to the intermediate shaft 21 and the internal teeth 14b, respectively. And between sprockets 20 and 23 and tin rocket 1
Chains 33 and 34 are stretched between 8 and 28 on the right side, and gear 19 and external teeth 14Jl mesh with each other. The one-way clutch 29 is configured to keep the planetary gear mechanism in a locked state in which it is rotatable according to the rotational direction and relative Δ rotation speed between the tin rocket 28 and the intermediate shaft 21.

The electromagnetic coupling device configured as described above performs the following six types of operations according to the connection/disconnection of each electromagnetic clutch/brake 3.4 and 5.6 depending on the number of teeth of each gear and sprocket. .

First, as a first operation, the electromagnetic clutch/brake 4, 5
．． When the electromagnetic coil 8 of the electromagnetic clutch 3 is demagnetized and only the electromagnetic coil 8 of the electromagnetic clutch 3 is energized, the armature 11 is connected to the rotor 1.
0 and the intermediate shaft 21 and the sprocket 23 are integrated through the hub 21 and the sprocket 10, so when the input shaft 15 rotates, the intermediate shaft 21 and the sprocket 23 integrated with this are connected through the chain 33. The sun gear 32 rotates. At this time, the one-way clutch 29 is in the locked state and the planetary gear unit is in the glued state, so the output cup 124 rotates at the same rotation speed as the sun gear 32.

Next, as a second operation, electromagnetic clutch-brake 3.4.
When the electromagnetic coil 8 of the electromagnetic clutch 5 is demagnetized and only the electromagnetic coil 8 of the electromagnetic clutch 5 is energized, the sprocket 18 and the input shaft 15 are integrated with each other due to the attraction of the armature 11. When the input shaft 15 is rotated, the chain 34 is rotated. The sprocket 28 rotates through the sprocket. At this time, one-way clutch 29
Since the planetary gear device is in a locked state, the output hub 24 rotates at the same rotation speed as the tin rocket 28. That is, the rotation ratio between the input shaft 15 and the output hub 24 is a tooth number ratio of sprocket 2G, 23 in the case of the first operation, and a tooth number ratio of sprocket 18.28 in the second operation.

Next, as a third operation, when the electromagnetic coil 8 of the electromagnetic clutch 3.5 is simultaneously excited and the input shaft 15 is rotated,
Said 1st. The second operation causes the sun gear 32 and the tin rocket 28 to simultaneously rotate at different speeds, and the output hub 2
4 rotates at a rotation speed that takes into account the tooth number ratio of the planetary gear device.

Next, as a fourth operation, the electromagnetic coil 8 of the electromagnetic clutch 6
When the input shaft 15 is energized and the input shaft 15 is rotated, the rotation is caused by the armature 11 which is crimped to the rotor 10 integrated with the input shaft 15.
This rotation is transmitted to the gear 19 through the rotation, and is transmitted to the internal gear 14 by meshing with the external teeth 14a, so this rotation is transmitted to the output hub 24 independently of the planetary gear system. At this time, the rotation ratio between the input shaft 15 and the output hub 24 is the gear 19, 1
4a), and the rotation direction is reverse rotation if the first to third operations are normal rotation.

Next, as a fifth operation, when only the electromagnetic coil 8 of the electromagnetic brake 4 is excited to rotate the input shaft 15, the internal gear 14 is braked by the attraction of the armature 11 by the stop plate 13, and at this time, the internal gear 14 is braked. Since no rotation is being transmitted, the output hub 24 is braked and does not rotate.

Next, as a sixth operation, if the electromagnetic coils 8 of all the electromagnetic clutches/brakes 3, 4, 5.6 are demagnetized, the input shaft 1
5 rotates, the rotation is not transmitted to the output hub 24, and the output hub 24 remains stationary.

In this way, the four electromagnetic clutch exposed brakes 3, 4, 5
．． By selectively energizing and demagnetizing the 8 electromagnetic coils 8, it is possible to change the speed to three stages of forward rotation and one stage of reverse rotation, and to brake and stop.

[Problem that the invention seeks to solve]

However, such conventional electromagnetic coupling devices are equipped with as many as four electromagnetic clutches and brakes, so
If the entire device is large, for example, if it is small like a copying machine,
When attached to items that strongly require weight reduction, problems arose in terms of occupied space and price.

[Means for solving problems]

In order to solve these problems, the present invention provides a forward rotation electromagnetic clutch that can change speed by controlling the excitation current between the input rotating member loosely mounted on the intermediate shaft and the fixed member fixed on the intermediate shaft. A reversing transmission mechanism drives and connects the idler member on the output shaft, which is interposed in parallel with the intermediate shaft and connected thereto by a forward rotation drive mechanism, and the input rotation member. A reversing electromagnetic clutch was interposed between the fixed member and the output shaft idler member, and the output rotating member was fixed on the output shaft.

[Effect]

With this configuration, when the input rotating member is rotated by the drive from the drive unit side and then the electromagnetic coil of the forward rotation electromagnetic clutch is excited, the rotation of the intermediate shaft via the fixed member is controlled by the forward rotation transmission mechanism. The rotation is transmitted to the output shaft as normal rotation, and is transmitted to the driven part side via the output rotation member. The output rotation speed at this time is changed by controlling the excitation current of the electromagnetic clutch. In addition, when the electromagnetic coil of the forward rotation electromagnetic clutch is demagnetized and the electromagnetic coil of the reverse rotation electromagnetic clutch is energized from this forward rotation state, the rotation of the input rotating member is transferred to the output shaft via the reverse rotation transmission mechanism and the reverse rotation electromagnetic clutch. The rotation is transmitted as reverse rotation to the output rotation member, and is transmitted to the driven part side via the output rotation member.

〔Example〕

1 to 3 show an example in which the electromagnetic coupling device according to the present invention is implemented in a copying machine, and FIG. 1 is a partially cutaway front view thereof;
2 is a side view of desk A in FIG. 1, and FIG. 3 is a side view of desk B in FIG. In these figures, the electromagnetic coupling device 40 installed in the t1 copying machine includes a casing 41 which is divided into several parts and connected together with screws.
A pair of upper and lower bearings 42 and 43 are respectively fixed.

An output shaft 44 and an intermediate shaft 45, which pass through the inside of the housing 41, are supported parallel to each other by the upper bearing 42 and the lower bearing 43. The gear 46 as a member is a disc member 52 that also forms a part of the play member.
(described later) is freely rotatably mounted through ball bearings 47 and 48 that are integral with it. 49.50 is gear 4B
These are a spacer and a snap ring that restrict movement in the axial direction. A sprocket 51 is attached to the boss of the knurled gear 46 as an input rotating member, which is connected to a motor on the driving side (not shown) of the drive unit by a chain.
are press-fitted and fixed, and as a result, sprocket 51,
A 47461 disc member 52 is loosely mounted on the input shaft 45 as an integral input rotating member. Between the disc member 52 constituting a part of the play member and the disc-shaped disc 53 as a fixing member that is press-fitted and fixed to the knurled surface of the input shaft 45, these disc members 52 and An electromagnetic clutch 54 for normal rotation, which includes a disk 53 as a component, is interposed.

This electromagnetic clutch 54 includes a field core 55 as a fixing member), and this field core 55 is fixed to the housing 41 side by a U-shaped mounting plate 56 screwed to the housing 41. .

The field core 55 is integrally formed with a substrate 55a and a tubular portion 55b protruding from its outer periphery, and a stepped cylindrical portion 55C is provided protruding from the center of the substrate 55H. Reference numeral 57 denotes an annular electromagnetic coil held via a bobbin in an annular groove formed by the tubular portion 55b and the cylindrical portion 55C, and is connected to a power source by a lead wire (not shown) to which a voltage is applied. The magnetic flux is configured to be formed by applying the magnetic flux. An annular member 58 made of a non-magnetic material is provided on the outer periphery of the disk member 52 made of a magnetic material.
A cylindrical member 59 made of a magnetic material is screwed onto the circumferential surface of the annular member 58 and has a thin annular portion that engages with an annular groove formed in the cylindrical portion 55C of the field core 550. It's stopped. The cylindrical member 59 is fitted onto the intermediate shaft 45 via a ball bearing 60), and in the annular groove formed between the three members 52, 58, and 59, the above-mentioned fixing member is inserted. A disk 53 is inserted, and the gap between the disk 53 and the annular groove is filled with magnetic powder particles 61 such as magnetic iron powder. With this configuration, the magnetic flux caused by voltage application to the electromagnetic coil 57 is distributed between the field core 55 made of magnetic material - the disk member 52 - the magnetic powder grains 61 - the disk 5
3-cylindrical member 59-field core 55, and the magnetic powder B1 is excited and solidified, so the input rotating member such as the sprocket 51 and the intermediate shaft 45 rotate integrally. Seals 62 prevent the magnetic powder particles 61 from flowing out along the intermediate shaft 45, and are formed in an annular shape and are interposed on both sides of the disk 53.

What is generally designated by the reference numeral 63 is a normal rotation transmission mechanism that transmits 450 rotations of the intermediate shaft as normal rotation in the same direction as the normal rotation to the output shaft 44. Gears 64.45 are respectively mounted on both shafts 44.45. 65, and gears 67 and 88 that are mounted on a gear shaft 66 on the side of the housing 41 and mesh with the gears 64 and 85, respectively, and are disposed outside the housing 41. Also, what is indicated by the reference numeral 6 as a whole is a reverse transmission mechanism that transmits the rotation of the input rotating member to the idler member on the output shaft 44 as rotation in the opposite direction, and in this embodiment, the gear 46 and A gear 70 that meshes with this is disposed within the casing 41 and serves as the input rotation member and play member, respectively.

Furthermore, on the output shaft 44, a gear 70 as an idler member is provided.
An electromagnetic clutch 71 for reverse rotation is provided to connect and disconnect rotational transmission between the output shaft 44 and the output shaft 44 . That is, a field core 13 formed in an annular shape is fixed to a mounting plate 72 whose end is inserted into a through hole of the housing 41, and the output shaft 44 is pivotally supported via a ball bearing 74. An annular electromagnetic coil 75 is held in the annular groove of the field core 73 via a bobbin. On the other hand, a hub 76 to which a gear 70 is screwed is loosely mounted on the output shaft 44 via a ball bearing 78 positioned between the hub 76 and the bearing 42 via a spacer 77. An annular armature 80, which is biased toward the hub 76 by a leaf spring 7g, is attached to the armature 80 via a leaf spring 79. Furthermore, a disc-shaped rotor 81 is keyed to the output shaft 44 and is disposed between the armature 80 and the electromagnetic coil 15, and a magnetic flux is formed by applying a voltage to the electromagnetic coil 75, and the rotor Armature 8 to 81
0 is absorbed, the gear 70 as an idle member
．． The hub 76 and the output shaft 44 are configured to rotate together.

An output drum 82 as an output rotating member is fixed to the protruding portion of the output shaft 44 from the housing 41, and a wire (not shown) whose both ends are fixed to a driven member is wound around the output drum 82. It is configured such that forward and reverse rotation of the output drum 82, which rotates integrally with the output shaft 44, is transmitted to the driven member.

Further, on the intermediate shaft 45, a well-known rotation speed detector 83 is mounted and fixed adjacent to the electromagnetic clutch 54, and detects the rotation waveform of the output drum 82 and turns on the electromagnetic coil 57.
By controlling the flowing current through OFF control, the electromagnetic clutch 54 is configured to obtain an arbitrary speed change output rotation.

The operation of the electromagnetic coupling device configured as above will be explained. When a motor (not shown) is started to drive the photosensitive drum and paper feed roller of the copying machine, the rotation of the motor shaft is transmitted to the sprocket 51 by the chain. Therefore, when a voltage is applied to the electromagnetic coil 57 of the forward rotation electromagnetic clutch 54, a magnetic flux passing through the path is formed, and the magnetic powder particles 61 are excited and solidified, so that the gear 46 and the three members integrated with the sprocket 51 are The rotations 52, 58, and 59 are transmitted to the intermediate shaft 45 via the magnetic powder particles 61 and the disk 53. At this time, the gear TO that meshes with the gear 46 is idling on the output shaft 44. The rotation of the intermediate shaft 45 is controlled by gears 65 and 68.
．． 87 and 84, the rotation is transmitted to the output shaft 44 as a forward rotation, and the output drum 82 rotates, so that the document feed table of the copying machine, which is a driven member connected to the output drum 82 by a wire, is driven in the forward direction. .

Next, when the electromagnetic coil 57 of the forward electromagnetic clutch 54 is demagnetized and the electromagnetic coil 75 of the reverse electromagnetic clutch 71 is energized, a magnetic flux is formed, and the rotor 81 attracts the armature 80 against the spring force of the leaf spring 79. Therefore, the rotor 81 fixed to the output shaft 44 and the gear 70 are integrated, and the rotation of the sprocket 510 as an input rotating member is controlled by the gears 46, 7.
Due to the zero mesh, the rotation is transmitted to the output shaft 44 in the opposite direction. Therefore, the document feed table connected to the output drum 82 by a wire is driven in the opposite direction.

When the output shaft 44 is driven to rotate in the forward direction, the flowing current is controlled by checking the rotation waveform on the output drum 82 side using the rotation speed detector 83 and controlling the energization to the electromagnetic coil #57 on and off. Any variable speed rotation can be obtained.

In this embodiment, a magnetic powder type electromagnetic clutch is illustrated as the forward rotation electromagnetic clutch, but other electromagnetic clutches may be used. Further, the forward rotation drive mechanism and the reverse rotation drive mechanism are not limited to gear drive mechanisms as in this embodiment, but may be chain drive mechanisms or the like. Furthermore, the present invention is limited to copying machines; it goes without saying that the present invention can be similarly applied to various machines such as computer peripherals and facsimile machines.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the electromagnetic coupling device, speed can be changed by controlling the excitation current between the input rotating member loosely mounted on the intermediate shaft and the fixed member fixed on the intermediate shaft. A forward rotation electromagnetic clutch is interposed, and a reverse rotation transmission mechanism drives and connects the idle member on the output shaft, which is parallel to the intermediate shaft and is connected to this by a forward rotation drive mechanism, and the input rotation member. At the same time, a reversing electromagnetic clutch is interposed between the fixed member on the output shaft and the idler member on the output shaft, and the output member is fixed on the output shaft. Just by using an electromagnetic clutch, forward rotation and reverse rotation are possible, and various variable speed output rotations can be obtained.
The entire device has a simple and compact structure, can be provided at low cost, and the performance of the device is improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the electromagnetic coupling device according to the present invention, FIG. K1 is a partially cutaway front view thereof, and FIG.
3 is a perspective view of A in the figure, FIG. 3 is a perspective view of B in FIG. 1, and FIG. 4 is a partially cutaway front view of a conventional electromagnetic coupling device. 40Φ--Electromagnetic coupling device, 41... Housing, 42.
43... Bearing, 44... Output shaft, 45...
Intermediate shaft, 46...-gear, 51... sprocket, 52... e disc member, 53... disk, 54
...Electromagnetic clutch, 55...Field core,
57...Fist/electromagnetic coil, 58...Annular member, 58
...Cylindrical member, 61...Magnetic powder grain, 63...
・Forward rotation transmission, 64, 85, 67.68...gear,
69... Reverse transmission mechanism, 70-... Gear, 11.
...Electromagnetic clutch, 73-...Field core, 7
5... Electromagnetic coil, 80@... Armature, 8
1... Rotor, 82... Output drum, 83...
...Rotation speed detector. ffi 2 (fund) Figure 3

Claims (1)

[Claims] an intermediate shaft and an output shaft that are supported parallel to each other in a housing;
An input rotating member whose movement in the axial direction is regulated by the intermediate shaft and is drivingly connected to the drive unit, and an input rotating member which is interposed between the input rotating member and a fixed member on the intermediate shaft and which generates an exciting current. A forward rotation electromagnetic clutch capable of changing speed by control, a forward rotation transmission mechanism that drives and connects the intermediate shaft and the output shaft so as to rotate them in the same direction, and an idler member on the input rotation member and the output shaft. a reversing transmission mechanism drive-coupled to rotate each other in opposite directions; a reversing electromagnetic clutch interposed between the idler member and a fixed member on the output shaft; and a reversing electromagnetic clutch fixed on the output shaft. An electromagnetic coupling device comprising: an output rotating member drive-coupled with a driven portion.