JPS61140622A - Power transmission device - Google Patents

Abstract

PURPOSE:To enable non-step speed change by interposing a normal turn electromganetic clutch between an input rotary member and a fixed member on an intermediate shaft and providing a rotating number detector controlling exciting current of the normal turn electromganetic clutch on the intermediate shaft or on an output shaft. CONSTITUTION:A sprocket gear 63, a gear 56 and a disc member 64 are provided loosely on an intermediate shaft 55 as an integral input rotary member, and the normal turn electromagnetic clutch 66 is interposed between the disc member 64 and a disc type disc 65 injected to be fixed to the intermediate shaft 55 as a fixed member. And a rotating number detector 98 is fixed to the intermediate shaft 55 adjacently to the electromagnetic clutch 66, and current flowed by ON, OFF control of an electromagnetic coil 69 is controlled by watching rotation wave shape on an output drum 94 side and the clutch 66 can obtain a desired output rotation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power transmission device that continuously changes the speed of the rotation of a driving member by controlling the excitation current of an electromagnetic clutch and transmits the rotation in forward and reverse directions to a driven member. be.

[Conventional technology]

In recent years, with the improvement in the quality and performance of electromagnetic clutches,
Power transmission devices incorporating electromagnetic coupling devices consisting of multiple electromagnetic clutches and gear groups have been developed and are used in computer peripherals and copying machines.

It has come to be widely used for facsimiles, etc.

Fig. 5 is a partially cutaway side view of this type of power transmission device disclosed in Japanese Patent Application Laid-Open No. 56-35846. Plates 1 and 2 are provided in a fixed manner, and these fixed plates 1 and 2
The electromagnetic clutch/brake 3, 4, 5.6 with the same configuration
is fixed. Each electromagnetic clutch/brake 3, 4,
5.6 is an annular stator T fixed to the fixed plates 1 and 2;
A predetermined gap is provided between the electromagnetic coil 8 supported in the annular groove, the disc-shaped rotor 10 fitted into the stator 7 via a ball bearing 9 and facing the electromagnetic coil 8, and the rotor 1G. An annular armature 11 arranged with
It is made up of. Only in the electromagnetic brake 4, an IC3jI-shaped stop plate 13 is fixed to the inner peripheral surface of the stator 7 instead of the rotor 10, and the ball bearing 9 has external teeth 14& and internal teeth 14b on the outer periphery. An internal gear 14 having
is fitted.

Reference numeral 15 designates an input shaft that is drivingly connected to a drive unit (not shown), and the rotors 10 of the electromagnetic clutches 5 and 6 are fitted and fixed onto this input shaft 15. Furthermore, the armature 11 of the electromagnetic clutch 5°6 is
It is supported movably in the axial direction by the outer periphery of a sprocket 18 and a gear 19 which are loosely mounted on the input shaft 15 via metals 16 and 17. Further, a sprocket 2G is fixed to a protrusion of the input shaft 15 from the fixed plate 1.

- An intermediate shaft 21 is pivotally supported by the rotor 10 of the electromagnetic clutch 3 and the internal gear 14 on the electromagnetic brake 4 side via a ball bearing 22, and the fixed plates 1, 2 of the intermediate shaft 21 A sprocket 23 fixed to the rotor 10 and an output hub 24 fixed to the internal gear 14 are freely rotatably mounted on the protrusion from the rotor 10 via ball bearings 25 and 26, respectively. Further, the armature 11 of the electromagnetic clutch 3 and the electromagnetic brake 4 is connected to the intermediate shaft 21.
The hub 2T fixed to the hub 2T and the internal gear 14 are each supported movably in the axial direction. The sprocket is supported by the intermediate shaft 21 via a one-way clutch 29, and a plurality of planetary gears 30 are pivotally connected by pins 31 at locations that equally divide the outer periphery of the sprocket in the circumferential direction. , each planetary gear field is meshed with a sun gear 32 integrally fixed to the intermediate shaft 21 and the internal teeth 14b and K, respectively. Chains 33 and 34 are stretched between the sprockets 20 and 23 and between the sprockets 18 and 18, respectively, and the gear 19 and the external teeth mesh at 14 degrees. The one-way clutch 29 is configured to allow the idling gear mechanism to rotate and to lock in accordance with the rotational direction and relative rotational speed of the sprocket 28 and the intermediate shaft 21.

The nine power transmission devices configured as described above perform the following six types of operations according to the engagement and disconnection of the electromagnetic clutches and brakes 3, 4, 5, and 6, depending on the number of teeth of each gear and sprocket.

First, as the 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 sprocket 23 are integrated through the hub 27 and rotor 10, so when the input shaft 15 rotates, the intermediate shaft 21 and the sprocket 23 are integrated with the fin through the chain 33. Gear 32 rotates. At this time, the one-way clutch 29 is in a locked state and the planetary gear device is in a glued state, so that the output hub 24 is connected to the sun gear 3.
Rotates at the same speed as 2.

Next, the second action is 11! Circular clutch 1 brake 3.
When the electromagnetic coil a1 of 4.6 is demagnetized and only the electromagnetic coil 8 of the electromagnetic clutch 5 is energized, the sprocket 18 and input shaft 15 become one body due to the adsorption of the armature 11.
When the input shaft 15 is rotated, the sprocket 28 is rotated via the chain 34.

At this time as well, the one-way clutch 29 is in the locked state and the planetary gear device is in the glued state, so the output hub 2
4 rotates at the same speed as the sprocket 28. In other words, the rotation ratio between the input shaft 15 and the output cutout 1b 24 is a tooth number ratio of 20°23 in the case of the first operation, and
In the case of the operation, it is the ratio of the number of teeth of the sprockets 18 and 28.

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 action causes the sun gear 32 and the sprocket 28 to simultaneously rotate at different speeds, causing 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 gear 14a, so this rotation is transmitted to the output hub 24 regardless of the rotary gear system. At this time, the rotation ratio between the input shaft 15 and the output hub 24 is
．． The rotation direction is reverse rotation if the first to third operations are positive rotation.

Next, as a fifth operation, the electromagnetic coil 8 of the electromagnetic brake 4
When the input shaft 15 is rotated by energizing only the stop plate 13
The internal gear 14 is braked by the suction of the armature 11, and since no rotation of the input shaft 15 is transmitted at this time, the output nose 24 is braked and does not rotate.

Next, the electromagnetic clutch/brake 3, 4 as the sixth operation
, 5.6, if the electromagnetic coil 8 is demagnetized, even if the shaft 15 is rotated by one person, the rotation will not be transmitted to the output nose 24, and the output cutter 1b 24 will be in a stationary state.

In this way, four electromagnetic clutches/brakes 3°4.5.
By selectively energizing and demagnetizing the electromagnetic coils 8 of No. 6, it is possible to change the speed to three forward speeds and one reverse speed, and to brake and stop the motor.

[Problem that the invention seeks to solve]

However, since such conventional power transmission devices are equipped with four electromagnetic clutches and brakes,
The overall size of the device is large, and when it is attached to something that is strongly required to be compact and lightweight, such as a copying machine, there are problems in terms of occupied space and price. Furthermore, since the speed ratio is determined by the number of electromagnetic clutches and the number of gear teeth, and stepless speed change is not possible, it is difficult to obtain clear images at all times when attached to a copying machine.

[Means for solving problems]

In order to solve such problems, in the present invention, an electromagnetic clutch for normal rotation is interposed between an input rotating member driven by a drive member having a rotation speed detector and a fixed member on the intermediate shaft. The loose member on the output shaft driven from the shaft side via the normal rotation transmission mechanism and the input rotation member are connected by a reverse rotation transmission mechanism, and the fixed member on the output shaft to which the output rotation member is fixed is connected. An electromagnetic clutch for reverse rotation is interposed in connection with the idler member, and a rotation speed detector for controlling the excitation current of the electromagnetic clutch for forward rotation is provided on the intermediate shaft or 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 input shaft via the fixed member is caused 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 first output rotation member. At this time, the load fluctuation on the driven part side is detected by the rotation speed detector on the t-drive member side, and the current value to the motor is changed, so the motor rotates at a constant rate, and the rotation speed detector on the intermediate shaft or output shaft side By controlling the excitation current to the electromagnetic coil, variable speed output rotation can be obtained. In addition, when the electromagnetic coil of the forward rotation electromagnetic clutch is demagnetized and the electromagnetic clutch 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. It is transmitted as reverse rotation to the driven part side via the first output shaft rotating member.

〔Example〕

Figures 1 to 4 show a copying machine in which a power transmission device according to the present invention is implemented, Figure 1 is a power transmission system diagram of a copying machine in which the power transmission device is implemented, and Figure 2 is an illustration of an electromagnetic coupling device. 3 is a partially cutaway front view, FIG. 3 is a perspective view of A in FIG. 2, and FIG. 4 is a perspective view of B in FIG.

In the figure, a drive shaft 42 as a driving member is drivingly connected to a motor shaft 41 of a DC motor 40 as a driving means disposed in a cabinet of a copying machine. A rotation speed detector 43, which will be described later, is interposed between the two. 44 is a photosensitive drum, 45 is a paper feed roller drive mechanism, and these are connected to a sprocket 46.
, 47, 48, and is driven from the drive shaft 42 side by a chain 49 stretched between them.

What is designated as a whole by the reference numeral 50 is an electromagnetic coupling device which is the main part of the power transmission device, and includes a casing 51 that is divided into several parts and connected with screws, and the side plates of the casing 51 are divided into several parts and are connected by screws. , a pair of upper and lower bearings 52 and 53 are respectively fixed. The upper bearing 52 and the lower bearing 53 are provided with a housing 52.
An output shaft 54 and an intermediate shaft 55 that completely pass through the inside are supported in parallel with each other, and on the intermediate shaft 55, a gear 56 as an idler member also forms a part of the idler member. Ball bearings 57 and 58 are integrated with a disc member 64 (described later).
It is freely rotatable for play.

59 and 60 are spacers and snap rings that restrict the movement of the gear 56 in the axial direction. The boss of the knurled gear 56 has a sprocket 6 on the drive shaft 42.
A sprocket 63 as an input rotating member is press-fitted and fixed to the intermediate shaft 55 as an input rotating member, which is drivingly connected to the intermediate shaft 55 by a chain 62. It is decorated as a toy.

A disc member 64 that constitutes a part of the play member and an intermediate shaft 55
These disc members 6 are placed between the disc-shaped disc 65 as a fixing member press-fitted into the knurled surface of the
An electromagnetic clutch 66 for normal rotation, which includes a disk 65 and a disk 65, is interposed.

The electromagnetic clutch 66 includes a field core 67 as a fixing member, and the field core 767 is fixed to the housing 51 by a U-shaped mounting plate 68 screwed to the housing 51.

The field core 6T is integrally formed with a substrate 67a and a tubular portion 69b protruding from the outer periphery thereof, and a stepped cylindrical portion 67° is provided at the center of the substrate 67. Reference numeral 69 denotes an annular electromagnetic coil held via a bobbin in an annular groove formed by the tubular portion 67b and the cylindrical portion 67c, and is connected to a power source by an IJ-wire (not shown) to apply voltage. The structure is such that magnetic flux is created by doing so. An annular member 70 made of a non-magnetic material is screwed to the outer periphery of the disk member 64 made of a magnetic material, and further, an annular member 70 made of a non-magnetic material is screwed to the inner periphery of the annular member TO.
A cylindrical member 7 made of a magnetic material and having a thin annular portion that engages with an annular groove formed in the cylindrical member 6Tc of the field core 67.
1 is screwed on. The cylindrical member T1 is fitted onto the intermediate shaft 55 via a ball bearing 72,
Further, in the annular groove formed between the three members 64 and 70°T1, there is a disk 65 as the fixing member described above.
The gap between this di-spout 65 and the annular groove is filled with magnetic powder particles 3 such as magnetic iron powder. In particular, with this configuration, the magnetic flux due to voltage application to the electromagnetic coil 69 is transmitted through the field core 6T, which is a magnetic material, the disk member 64, the magnetic powder particles 73, and the disk 6.
5-cylindrical member 71-field core 67, and the magnetic powder particles 73 are excited and solidified, so that the input rotating member such as the sprocket 63 rotates integrally with the intermediate shaft 55. A seal 74 prevents the magnetic powder particles 73 from flowing out along the intermediate shaft 55, and is formed into an annular shape and is placed between traps on both sides of the disk 65.

What is generally designated by the reference numeral 75 is a normal rotation transmission mechanism that transmits 550 rotations of the intermediate shaft as normal rotation in the same direction as the normal rotation to the output shaft 54. .77, and gears ys and a that are mounted on the gear shaft 78 on the housing 51 side and mesh with gears 76 and 77, respectively.
o, and is arranged outside the housing 51. Furthermore, what is generally designated by the reference numeral 81 is a reverse transmission mechanism that transmits the rotation of the input rotation member to the idler member of the output shaft 54 as rotation in the opposite direction, and in this embodiment, the gear 56 and this A meshing gear 82 serves as the input rotation member and play member, respectively, and is disposed within the casing 51.

Furthermore, on the output shaft 54, a gear 82 as an idler member is provided.
An electromagnetic clutch 83 for reverse rotation is provided to connect and disconnect rotation transmission between the output shaft 54 and the output shaft 54 . That is, a field core 85 formed in an annular shape is fixed to a mounting plate 84 whose end is inserted into the entire through hole of the housing 51, and pivotally supports the output shaft 54 via a ball bearing 86'. An annular electromagnetic coil 87 is held in the annular groove of the field core 85 via a bobbin. on the other hand,
A hub 88 to which the gear 82 is screwed is loosely mounted on the output shaft 54 via a ball bearing 901 positioned between the hub 88 and the bearing 52 via a spacer 89, and an end surface of the hub 88 has a An annular armature 92 biased toward the hub 88 by a leaf spring 91 is mounted via the leaf spring 91. Further, a disc-shaped rotor 93 is keyed to the output shaft 54 and is disposed between the armature 92 and the electromagnetic coil 8T, and the electromagnetic coil 87
When a magnetic flux is formed by applying a voltage to the rotor 93 and the armature 92 is attracted to the rotor 93, the gear 82. The hub 88 and the output shaft 54.

It is configured to rotate as a body.

An output drum 94 as an output rotating member is fixed to the protrusion of the output shaft 54 from the housing 51, and a first
A wire 96 is wound around the intermediate drum 95 shown in the figure, so that the forward and reverse rotation of the output drum 94, which rotates integrally with the output shaft 54, is transmitted to the document feed table 97 through the intermediate drum 95. It is configured.

The rotation speed detector 43 between the motor 40 and the drive shaft 42 issues a signal to the control device to increase the power supply value to the motor 40 when a load is applied to the output drum 94, that is, the document feeder 9T. The rotation speed of the motor 40 is always kept constant. Further, a rotation speed detector 98 is fixed on the intermediate shaft 55 adjacent to the electromagnetic clutch 66, and detects the rotation waveform on the output drum 94 side and controls the ON/OFF control of the electromagnetic coil 69 to control the current flow. By controlling , the electromagnetic clutch 66 is configured to obtain an arbitrary output rotation.

The operation of the power transmission device configured as above will be explained. When the motor 40 is started, the rotation of the drive shaft 42 causes
The photosensitive drum 44 and paper feed roller 45, which are drivingly connected by a chain 49, rotate, and the sprocket 63 of the electromagnetic coupling device 50, which is drivingly connected by a chain 62, rotates. Therefore, the electromagnetic coil 69 of the electromagnetic clutch 66 for forward rotation
When KK pressure is applied, a magnetic flux passing through the path is formed, and the magnetic powder particles 73 are excited and solidified, so that the gear 56 and 3g, which are integral with the sprocket 63, and the material 64°70.7
1 is transmitted to the intermediate shaft 55 via the magnetic powder particles 73 and the disk 65. At this time, the gear 82 meshing with the gear 56
is idling on the output shaft 54. The rotation of the intermediate shaft 55 is transmitted as a constant rotation to the output shaft 54 through the gears 77, 80 and 79 degrees T6, and the output drum 94 rotates.
A document feed table 97 is driven in the forward direction via an intermediate drum 95 connected to this by a wire 96.

Next, when the electromagnetic coil 69 of the forward electromagnetic clutch 66 is demagnetized and the electromagnetic coil 87 of the reverse electromagnetic clutch 83 is energized, a magnetic flux is formed, and the rotor 93 attracts the armature 92 against the spring force of the leaf spring 91. Therefore, the rotor is fixed to the output shaft 54! 13 and gear 82 are integrated, and rotation of sprocket 630 as an input rotating member is caused by gear 56.
82, rotation in the opposite direction is transmitted to the output shaft 54. Therefore, the wire 9 is connected between the output drum 94 and the output drum 94.
6 and an intermediate drum 95.
7 is driven in the opposite direction.

When the output shaft 54 is driven to rotate in the forward direction, the current flowing through the output drum 94 side is controlled by the rotational waveform of the output drum 94 side by the rotational speed detector 98, and arbitrary variable speed rotation can be obtained.

Furthermore, when a load is applied to the output drum 94 side, the control circuit that receives the input signal from the rotation speed detector 43 increases the current value to the motor 40, so that the motor 40 always rotates at a constant rotation speed. Therefore, the rotation input to the electromagnetic coupling device 50 is always constant. For example, when a load is applied to the document feeder 97 and the rotation speed changes, the rotation speed detector 9B detects this and an input signal enters the control circuit. The excitation current to the electromagnetic coil 69 of the electromagnetic clutch 66 is controlled to maintain a constant rotation speed. As a result, the drive shaft 42 and the electromagnetic coupling device 50
The rotation ratio with the intermediate drum 95, which is drive-coupled via T, is always constant regardless of changes in load, and therefore the ratio of the rotation speeds between the photosensitive drum 44, the paper feed roller 4, and the document feed table 9T is constant. always remains constant.

motor/41 (in the case of an induction motor, the output rotation speed of the Tanabata 40 and the electromagnetic clutch 66 is controlled by the respective output rotation speed computers, and the excitation current to the electromagnetic coil 69 of the electromagnetic clutch 66 changes, so the document feeder table 9T If the rotation of the motor 40 changes due to load fluctuations, the output speed of the electromagnetic clutch 66 also changes, and as a result, the rotation ratio of the motor 40 and the plurality of driven members, that is, the rotation ratio of the photosensitive drum 442, the paper feed roller, and the document feed table 9T, changes. is always constant.

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 the case of the main dormitory, but may be chain drive mechanisms or the like. Furthermore, it goes without saying that the present invention can be implemented not only in copying machines but also in various other machines such as computer peripherals and facsimile machines.

〔Effect of the invention〕

As is clear from the above explanation, according to the I/C1 present invention, in a power transmission device, an electromagnetic force for forward rotation is provided between an input rotating member driven by a driving member having a rotation speed detector and a fixed member on an intermediate shaft. A clutch is interposed, and the idler member on the output shaft driven from the intermediate shaft side via the forward rotation transmission mechanism and the input rotation member are connected by a reverse rotation transmission mechanism,
The output rotating member is fixed, and a reversing electromagnetic clutch is interposed between the fixed member on the large output shaft and the loose member, and a rotation speed detector is provided on the intermediate shaft to control the excitation current of the forward rotating electromagnetic clutch. By configuring the device to have a 2-way rotation, forward and reverse rotation is possible with just two electromagnetic clutches, and stepless variable speed output rotation can be obtained, making the entire device simple and compact. can be provided at low cost, and
The performance of equipment equipped with this improves. In addition, by controlling the rotational speed of the driving member and the forward rotation electromagnetic clutch, the ratio of the rotational speed of the driven member directly driven by the driving member and the driven member driven via the electromagnetic coupling device is always maintained constant. This further improves the performance of equipment equipped with this.

[Brief explanation of the drawing]

1 to 4 show the implementation row of the power transmission device according to the present invention, FIG. 1 is a power transmission system diagram of a copying machine implementing this, and FIG. 2 is a partially cutaway front view of the electromagnetic coupling device. , Figure 3 is a visual survey view of A in Figure 2, Figure 4 is a visual survey view of B in Figure 2,
FIG. 5 is a partially cutaway front view of a conventional power transmission device. 40・Fist・DC motor, 42・・Drive shaft, 43−
... Rotation speed detector, 44... Photosensitive drum, 45.
...Paper feed roller, 46.47, 411°61.63
... Sprocket, 50... e. Electromagnetic coupling device, 5
4... Output shaft, 55... 0. Intermediate shaft, 56'-...
・Gear, 62・・Chain, 64・・Disc member, 65・・・Disc, 66・・・Electromagnetic clutch,
67... Filled core, 69...-Vta coil, 70... Annular member, 71 Φ... Cylindrical member, 73
...Magnetic powder, 75...Forward transmission @ Sakaki, T6゜7.7, 79.80...Gear, 81...0 Reverse transmission barrel, 82.11@ ・Kia , 83...fist/electromagnetic clutch, 85...field core, 87...tt
i coil, 92--armature, 93, fist... rotor, 94.00. Output drum, 95...Intermediate drum, 96...Wire, 97...Document feed stand, 9
8...Rotation speed detector.

Claims (1)

[Claims] a rotational speed detector interposed between a driving means and a driving member driven by the driving means; an input rotating member loosely mounted on an intermediate shaft and drivingly connected to the driving member; An electromagnetic clutch for forward rotation that is interposed between a fixed member on the intermediate shaft and can change speed by controlling the excitation current, and a positive clutch that drives and connects the intermediate shaft and an output shaft parallel to the intermediate shaft so as to rotate in the same direction. a rotation transmission mechanism, a reverse rotation transmission mechanism that drives and connects the input rotating member and the idler member on the output shaft so as to rotate them in opposite directions, and the idler member and the fixed member on the output shaft. an electromagnetic clutch for reversing interposed between, an output rotating member fixed on the output shaft and drivingly connected to the driven member, and a rotation speed detector mounted on the intermediate shaft or the output shaft. A power transmission device characterized by being provided with.