JP2000182864A - Ferrite core, ferrite core coil unit, power transmission device, and rotary joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device which can efficiently transmit power to many power supply parts on a noncontact basis. SOLUTION: A disk-shaped ferrite core is formed with a plurality of concentric coil accommodating paths and partition walls, and air core coils 21 having a prescribed number of turns are accommodated in the associated coil accommodating parts. A pair of ferrite core coil units 6 and 7 thus arranged has a prescribed spacing therebetween, and are positioned so that a rotary axis L coincides with their rotary central axes of the units for allowing relative rotation. Then a pulse-like current is supplied independently to the respective air core coils 21 of the ferrite core coil unit 7 on the stationary side, whereby electromagnetic induction action causes generation of an electromotive force independently in each of the air core coils 21 of the coil unit 6 on its rotary side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferrite core having an air core coil receiving portion, a ferrite core coil unit including the ferrite core and the air core coil, and a rotating part using the ferrite core coil unit. The present invention belongs to the technical field of a power transmission device for performing power transmission between stationary parts by electromagnetic coupling, and a rotary joint including the power transmission device.

[0002]

2. Description of the Related Art Conventionally, a roll feeder as shown in FIG. 16 has been used in a large, high-speed printing apparatus for printing newspapers and the like. The roll paper feeding device shown in FIG. 16 is configured so that two rolls 50 can be wound, and can be connected to the next roll without interrupting printing immediately before the previous roll ends.

For this purpose, the two arms 51, 52 supporting the roll 50 are mounted on the rotary shaft 53 so as to rotate about the rotary shaft 53. The rotary shaft 53 is provided with ball bearing units 54, 55. Are supported rotatably. As shown in FIG. 13, a gear 56 is attached to the shaft end of the rotating shaft 53. The gear 56 includes an intermediate gear 57 that meshes with the gear 56, and an intermediate gear 57.
The rotational driving force of the motor 59 is transmitted through a gear 58 that meshes with the gear.

With the above-described mechanism, the arm portions 51,
52 turns to move the supporting roll 50 to a predetermined sheet feeding position. The roll 50 is supported by pushing the cone chucks 60 and 61 shown in FIG.

[0005] The cone chucks 60 and 61 are shown in FIG.
As shown in the figure, the shaft portion is configured to be movable in the cylinders 62 and 63, and the cylinders 62 and 63
By supplying compressed air of about g / cm2, the roll 50 is pushed into the core. This cylinder 62,
The supply of compressed air to the motor 63 is controlled by a solenoid valve.
By turning N / OFF, the solenoid valve is opened and closed.

The right cone chuck 61 shown in FIG. 17 is also provided with a moving mechanism by a motor (not shown), and the rotational driving force of the motor is transmitted via pulleys 64 and 65 and a belt 66. , The cone chuck 6
Fine adjustment of the axial movement amount is possible. By such fine adjustment, positioning of the roll 50 in the axial direction is performed accurately. Further, as shown in FIG. 17, the paper feeding device is provided with an arm driving mechanism 67, and the left arm 51 is moved in the axial direction of the rotation shaft 53 by the rotation of a motor (not shown). Move. Thereby, even when the roll width changes, the roll can be reliably supported by the arms 51 and 52. The power supply to these motors is performed from a stationary unit.

As described above, in the roll paper feeder, it is necessary to supply power and supply compressed air to the cylinders 62 and 63 not only to the stationary part but also to the rotating part. is there. Further, it is necessary to transmit a control signal to each part on the rotating part side.

Therefore, conventionally, as shown in FIG. 18, a large slip ring 68 of a disk type is mounted on a rotating shaft 53.
Provided at the shaft end 53a of the
The power supply and the transmission of the input signal to the sequencer 69 were performed.

As for the compressed air, as shown in FIG. 18, the inside of the shaft end 53a of the rotating shaft 53 is formed hollow, and the tube 70 is disposed in the hollow portion. The rotary joint 71 was connected, and compressed air was sent from the rotary joint 71 for air.

This rotary joint for air 71
Has a rotating part 71a and a stationary part 71b. In order to further maintain airtightness, a tip part 71c of the rotating part 71a is threaded, and the rotating part 71b is attached to a lid 53b of the rotating shaft 53.
Installation was performed by screwing a.

[0011]

However, when the large slip ring 68 of the disk type as described above is used, there is a problem in noise resistance, high-speed signal transmission cannot be performed, and long-term transmission is not possible. The contact area is worn by using
There has been a problem that signals cannot be transmitted well. Also,
There is a problem that the slip ring itself is expensive and the paper feeding device is further enlarged. Further, the number of cables required for the number of signal points is required, and routing is not easy.

On the other hand, a data transmission rotary joint as shown in FIG. 19 is known as a device capable of non-contact high-speed data communication between a rotating part and a stationary part. It could be used for transmission of data, but there were the following problems.

As shown in FIG. 19, the rotary joint for data transmission has a rotatable housing 81.
And a fixed housing 83 are disposed facing each other, and the antenna elements 85 and 86 housed inside the housing 81 and the housing 83 respectively provide
It transmits data.

The housing 81 has a cylindrical portion 81a which is long in the axial direction (vertical direction in the figure).
A flange portion 81b is formed so as to protrude from the outer peripheral portion of 1a.

A housing 83 is provided on the outer peripheral portion of the cylindrical portion 81a via bearings 82, 82 so as to be rotatable with respect to the housing 81. The outer peripheral portion of the housing 83 has a flange portion 83a Are formed.

An annular space 84 is formed in the flange 83a by the flange 81b of the housing 81.
An outer peripheral wall 83b is formed to form an antenna element 85 in an annular space 84, an antenna element 85 in an annular space 84, and an antenna element 86 in an annular space 83a. As can be seen, they are arranged facing each other.

The cylindrical portion 81a and the antenna element 8
A bearing 87 is arranged between the antenna element 6 and the antenna element 86 so that the cylindrical portion 81a rotates smoothly with respect to the antenna element 86.

According to the rotary joint for data transmission as described above, since the antenna elements 85 and 86 are not in contact with each other, data can be transmitted well over a long period of time. By the bent portion A formed in the 83b, it is possible to minimize the leakage of radio waves during transmission and reception to the outside. Further, the influence of an external radio wave can be reduced. Also,
The data transmission rotary joint can be formed to have a maximum diameter of, for example, about 50 mm, and can be made smaller than a conventional disk type slip ring.

However, the level of a signal that can be transmitted by the rotary joint for data transmission is very weak, and power for power supply cannot be transmitted.

Therefore, it is still necessary to use the slip ring for supplying power for power supply, and there has been a problem that the durability of the slip ring deteriorates due to wear of the contact portion of the slip ring.

The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problems, and has been made in consideration of the above-described problems. It is an object to provide a device, a rotary joint, a ferrite core coil unit used for the same, and a ferrite core used for the same.

[0022]

According to a first aspect of the present invention, there is provided an endless ferrite core in which a core member made of a ferrite material is entirely embedded and housed in a core member formed of a ferrite material. A ferrite core having a coil storage recess formed therein, wherein the coil storage recesses have different storage path lengths, and surround a coil storage recess having a short storage path length with a coil storage recess having a long storage path length. It is characterized by being provided at a plurality of places so as to form a partition wall of a predetermined width between the storage recesses.

According to the ferrite core of the present invention, since the endless coil housing concave portion is formed in the core member formed of the ferrite material, the air-core coil wound a predetermined number of times can be used. Are entirely buried in the coil housing recess. Therefore, the magnetic flux generated by applying a current to the air-core coil passes through the magnetic path formed by the core member around the coil housing concave portion.
Enables power transmission with less leakage of magnetic flux. Moreover, a plurality of coil storage recesses having different storage path lengths are formed in the core member, and are disposed so as to surround the coil storage recesses having a short storage path length with the coil storage recesses having a long storage path length. You. In other words, a plurality of coil housing recesses are formed by effectively using the coil housing recess forming area in the core member, and the air-core coil is housed independently in each of the coil housing recesses. Therefore,
By applying a current to each air core coil independently,
Power transmission can be performed independently of each other. Further, since a partition wall having a predetermined width is formed between the coil housing recesses, magnetic fluxes generated from the respective air core coils and passing through the magnetic path formed by the core member around each coil housing recess are formed. The interference is small and does not affect each other's power transmission.

According to a second aspect of the present invention, in order to solve the above problem, in the ferrite core according to the first aspect, the coil accommodating recess is formed in an annular shape, and each coil accommodating portion is concentric. It is characterized in that it is provided at a plurality of locations so as to be located in a shape.

The coil housing recess in the ferrite core according to the second aspect is an annular coil housing recess, and the coil housing portions are arranged concentrically with the partition wall interposed therebetween. Therefore, similarly to the ferrite core of claim 1, not only a plurality of independent power transmissions can be performed without leakage of the magnetic flux, but also the ferrite cores are arranged on both the stationary side and the rotating side so as to be relatively opposed to each other. Even when the ferrite cores are arranged rotatably, the power transmission can always be continued in the same state regardless of a change in the relative position of each ferrite core.

According to a third aspect of the present invention, there is provided a ferrite core coil unit in which an air-core coil is accommodated in each of the coil accommodating recesses of the ferrite core according to the first or second aspect. It is characterized by.

According to the ferrite core coil unit of the third aspect, each of the plurality of coil housing recesses of the ferrite core of the first or second aspect has
Since the air-core coils are housed, power is transmitted independently by passing a current to each air-core coil, and the magnetic flux generated from each air-core coil is transferred to the adjacent coil housing recess. In the partition wall having a predetermined width formed therebetween, the partition walls pass through the magnetic path formed by the core member without interfering with each other, so that a plurality of power transmissions do not interfere with each other and leakage of magnetic flux is small. Done in state.

According to a fourth aspect of the present invention, there is provided a ferrite core coil unit comprising: a plurality of divided ferrite cores each having a recess penetrating from one end surface to the other end surface; A supporting member,
An air-core coil is provided, and annular coil storage paths having different storage path lengths are respectively formed by the recesses, and the split ferrite core is placed on the surface of the support member so that the respective coil storage paths are provided concentrically. The air core coil is accommodated in each of the coil accommodating passages in a circumferential direction and a radial direction.

According to the ferrite core coil unit of the fourth aspect, the split type ferrite cores are mounted on the support member so as to be arranged side by side in the circumferential direction and the radial direction. The recesses form annular coil storage paths having different storage path lengths, and these annular coil storage paths are provided concentrically. In these coil storage paths, air-core coils are stored, and a plurality of power transmissions are possible with a simple configuration using an existing ferrite core while effectively using the mounting area of the support member. . Further, the magnetic flux generated by passing a current through the air-core coil passes through the split ferrite core as a magnetic path, so that power transmission with less leakage of the magnetic flux is performed. Although some gaps are formed between the divided ferrite cores in the circumferential direction, the lengths of these gaps are smaller than the length of the entire storage path even when all of them are added, so that leakage of magnetic flux can be suppressed as much as possible. In addition, since the split ferrite cores around each coil storage path are independent of each other, the concentric coil-forming paths are independent of each other. Will be performed.

According to a fifth aspect of the present invention, there is provided a ferrite core coil unit according to the fourth aspect, wherein the split type ferrite core is a semi-cylindrical ferrite core. It is characterized by the following.

According to the ferrite core coil unit of the fifth aspect, since the semi-cylindrical divided ferrite cores are mounted on the support member side by side in the circumferential direction and the radial direction as described above, each divided ferrite core is mounted on the support member. The mold ferrite cores can be easily mounted side by side in the circumferential direction and the radial direction, and a large-diameter ferrite core coil unit having a plurality of coil storage paths can be formed.

According to a sixth aspect of the present invention, there is provided a ferrite core coil unit according to the fourth aspect, wherein the split type ferrite core is a U-shaped ferrite core. It is characterized by the following.

According to the ferrite core coil unit of the sixth aspect, the U-shaped split type ferrite core has:
As described above, since the split ferrite cores are mounted side by side in the circumferential direction and the radial direction on the support member, each split ferrite core is easily mounted side by side in the circumferential direction and the radial direction, and includes a plurality of coil storage paths. It is also possible to form a ferrite core coil unit having a large diameter.

According to a seventh aspect of the present invention, there is provided a ferrite core coil unit according to the fourth aspect, wherein the split type ferrite core is an E-shaped ferrite core. It is characterized by the following.

According to the ferrite core coil unit of the seventh aspect, the E-shaped split type ferrite core has:
As described above, since the split ferrite cores are mounted side by side in the circumferential direction and the radial direction on the support member, each split ferrite core is easily mounted side by side in the circumferential direction and the radial direction, and includes a plurality of coil storage paths. It is also possible to form a ferrite core coil unit having a large diameter.

According to an eighth aspect of the present invention, there is provided a ferrite core coil unit according to any one of the fourth to seventh aspects, wherein the ferrite core coil unit is provided on a surface of the support member. The height to the surface of the ferrite core is substantially constant.

According to the ferrite core coil unit of the present invention, since the height of the surface of the split type ferrite core with respect to the surface of the support member is substantially constant, these ferrite core coil units have a predetermined gap. When the gaps are opposed to each other, the gap is maintained at a predetermined value throughout the divided ferrite cores juxtaposed in the circumferential direction and the radial direction, so that the power transmission characteristics do not vary. Further, since the gap is maintained at a predetermined value everywhere even when the ferrite core coil units are relatively rotated with each other, the predetermined gap can be miniaturized. Therefore, power transmission efficiency is improved. Furthermore, when the ferrite core coil units are brought into contact with each other, a gap is not generated in the contact portion, and the degree of adhesion is improved, so that leakage of magnetic flux is significantly reduced, and extremely efficient power transmission is performed. .

According to a ninth aspect of the present invention, there is provided a ferrite core coil unit according to any one of the fourth to eighth aspects, wherein the supporting member is non-magnetic. Characterized by being formed from the above member.

According to the ferrite core coil unit of the ninth aspect, since the support member for supporting the ferrite core is formed of a non-magnetic member, the magnetic flux does not pass through the support member, and the magnetic flux changes. Generation of heat is prevented.

According to a tenth aspect of the present invention, there is provided a power transmission device as set forth in any one of the third to ninth aspects, wherein:
A pair of ferrite core coil units having substantially the same coil storage path length and width are provided, and the pair of ferrite core coil units are overlapped so that the air core coils stored in the respective coil storage paths face each other. It is characterized by the following.

According to the power transmission device of the tenth aspect, the superposed ferrite core coil units according to any one of the third to ninth aspects have substantially the same coil storage path length and width. Since they are the same, if the air-core coils stored in the respective coil storage paths are opposed to each other,
The air-core coils oppose each other in a state where there is no deviation between the air-core coils, and the partition walls oppose and adhere to each other without any deviation between the partition walls. Therefore, the magnetic flux generated by applying a current to the air core coil of one ferrite core coil unit is:
It passes through the partition wall, passes through the partition wall of the other opposing ferrite core coil unit without causing interference with the magnetic flux from the adjacent air core coil, and surrounds the air core coil of the other ferrite core coil unit. Will generate a magnetic flux. As a result, an electromotive force is generated in the air-core coil by electromagnetic induction, and power is transmitted. As described above, since power transmission is performed in a state in which magnetic flux leakage is extremely small using the ferrite core as a magnetic path, efficient power transmission is performed. In addition, since these power transmissions are performed independently in a plurality of power transmission channels consisting of each air core coil and a ferrite core around it, when power transmission is performed independently in many places However, it is not necessary to route cables and the like, and handling becomes extremely easy. Furthermore, since the transmission of these power supplies is performed in a non-contact manner, there is no abrasion of the contacts, and the power transmission is performed well over a long period.

According to a eleventh aspect of the present invention, there is provided a ferrite core coil unit according to any one of the third to ninth aspects, wherein:
A pair of ferrite core coil units having substantially the same coil storage path length and width are provided, and the pair of ferrite core coil units face each other such that the ferrite core coil units have a predetermined gap on the same axis,
It is characterized by being arranged so as to be rotatable relative to each other.

According to the power transmission device of the eleventh aspect, the power transmission devices are coaxially opposed to each other with a predetermined gap, and are disposed so as to be rotatable relative to each other. Since the ferrite core coil units according to any one of the above have substantially the same coil storage path length and width, even if they are arranged so as to have a predetermined gap as described above, or when they are rotated relative to each other. However, the air-core coils oppose each other without any deviation between the air-core coils, and the partition walls oppose each other without any deviation between the partition walls. Therefore, the magnetic flux generated by applying a current to the air-core coil of one of the ferrite core coil units passes through the partition wall and is opposed via the air gap without causing interference with the magnetic flux from the adjacent air-core coil. Reaches the partition wall of the other ferrite core coil unit. Then, a magnetic flux is generated around the air core coil of the other ferrite core coil unit through the inside of the partition wall. As a result, an electromotive force is generated in the air-core coil by electromagnetic induction, and power is transmitted. As described above, although the air gap exists, the power transmission is performed in a state where the leakage of the magnetic flux is extremely small by using the ferrite core as the magnetic path, so that the power transmission is performed efficiently. In addition, since these power transmissions are performed independently in a plurality of power transmission channels consisting of each air core coil and a ferrite core around it, when power transmission is performed independently in many places However, it is not necessary to route cables and the like, and handling becomes extremely easy.
Furthermore, since the transmission of these power supplies is performed in a non-contact manner, there is no abrasion of the contacts, and the power transmission is performed well over a long period of time. In particular,
Since a plurality of independent power supplies are supplied from the stationary side to the rotating side, a power transmission device which is extremely excellent in ease of handling and durability as compared with the case where a slip ring is used is provided.

According to a twelfth aspect of the present invention, in order to solve the above-mentioned problem, a rotary joint is provided on a first housing member attached to a rotary shaft or integrally formed with the rotary shaft, and The ferrite according to any one of claims 3 to 9, further comprising a second housing member rotatably mounted by a bearing, wherein each of the first housing member and the second housing member is provided. A core coil unit, comprising: a ferrite core coil unit having substantially the same coil storage path length and width, wherein the respective ferrite core coil units are mutually separated in the first housing member and the second housing member. Ferrite core coil units face each other coaxially with a predetermined gap, and can rotate relative to each other Characterized in that it is arranged so that.

According to the twelfth aspect of the present invention, by supplying a current to the coil of the primary side ferrite core coil unit formed in the second housing member, a magnetic flux that changes in accordance with the current is generated. Most of the magnetic flux passes through the inside of the ferrite core in the ferrite core coil unit according to any one of claims 3 to 9. The secondary ferrite core coil unit formed on the first housing member facing the ferrite core coil unit faces the primary ferrite core coil unit coaxially with a predetermined gap. Are arranged so as to be rotatable relative to each other. Therefore, even if the air-core coils are arranged so as to have a predetermined gap or rotate relative to each other, the air-core coils face each other without any deviation, and the partition wall is a partition wall. They face each other without any deviation. Therefore, the magnetic flux generated by the ferrite core coil unit on the primary side passes through the partition wall on the primary side, and does not interfere with the magnetic flux from the adjacent air-core coil. Reaches the partition wall of the ferrite core coil unit. Then, a magnetic flux is generated around the air-core coil of the ferrite core coil unit on the secondary side through the partition wall. As a result, electromotive force is generated in the air-core coil by electromagnetic induction, and power is transmitted from the primary side to the secondary side. As described above, although the air gap exists, the power transmission is performed in a state where the leakage of the magnetic flux is extremely small by using the ferrite core as the magnetic path, so that the power transmission is performed efficiently. In addition, since these power transmissions are performed independently in a plurality of power transmission channels consisting of each air core coil and a ferrite core around it, when power transmission is performed independently in many places However, it is not necessary to route cables and the like, and handling becomes extremely easy. Furthermore, since the transmission of these power supplies is performed in a non-contact manner, there is no wear of the contacts,
Performed well over a long period of time. In particular, a plurality of independent power supplies are supplied from the stationary side to the rotating side, so that the rotary power transmission rotary shaft is extremely easy to handle and durable compared to the case where a slip ring is used. Become a joint.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view for explaining a schematic configuration of a power transmission rotary joint according to a first embodiment of the present invention.

As shown in FIG. 1, the rotary joint 1 of the present embodiment comprises a first housing member 2 on the rotating side,
Bearings 3a and 3b, a stationary second housing member 4 supported by the first housing member 2 via the bearings 3a and 3b, a support plate 5a attached to the first housing member 2, 2 includes a support plate 5b attached to the flange portion 4b of the housing member 4, a first ferrite core coil unit 6 supported by the support plate 5a, and a second ferrite core coil unit 7 supported by the support plate 5b. I have. Also, the first housing member 2
A rotating shaft member 8 is attached to the second housing member 4, and a connector section 10 is attached to the second housing member 4.

The first housing member 2 is formed of anodized aluminum and has a flange 2a and a shaft 2b. The inner ring of the bearing 3a is fitted into the flange 2a,
Is fitted with the inner race of the bearing 3b.

The second housing member 4 is also made of aluminum, and the surface of the cylindrical wall 4c is anodized. The ring 4a of the second housing member is fitted to the outer ring of the bearing 3a, and the flange 4b of the second housing member 4 is fitted to the outer ring of the bearing 4b.

The shaft portion 2b of the first housing member 2 is provided with a hollow disk-shaped stainless steel support plate 5a provided substantially perpendicular to the rotation center axis L.
The first ferrite core coil unit 6 is attached to the first.

The first ferrite core coil unit 6 is provided with a plurality of independent coils in a ferrite core as described later, and wiring from each coil is prevented from being short-circuited in the wiring section 9. Summarized. An induced electromotive force is generated in each coil of the first ferrite core coil unit 6 by the action of mutual induction as described later, and the induced electromotive force can be supplied to the rotating side.

On the other hand, a hollow disk-shaped support plate 5b made of stainless steel is also attached to the flange portion 4b of the second housing member 4, and the second support member 5b
A ferrite core coil unit 7 is mounted so as to face the first ferrite core coil unit 6. Like the first ferrite core coil unit 6, the second ferrite core coil unit 7 has a plurality of independent coils in the ferrite core as described later, and the wiring from each coil is connected to the wiring section 11 respectively. And are electrically connected to a stationary power supply or the like. The first ferrite core coil unit 6 and the second ferrite core coil unit 7 are opposed to each other with a gap of 0.5 mm to 1 mm, and when a current is applied to each coil by a stationary power converter or the like. In the second ferrite core coil unit 7, a magnetic field is generated, and an induced electromotive force is generated in the first ferrite core coil unit 6 by the mutual induction.

As described above, the first ferrite core coil unit 6 and the second ferrite core coil unit 7
Constitutes a power transmission coupler for transmitting power using electromotive force generated by mutual induction (electromagnetic induction).

The rotating shaft member 8 is an aluminum member having a hollow inside, and the mounting screws 8a, 8
b is attached to the outer wall of the first housing member 2. The wiring of each coil of the first ferrite core coil unit 6 on the rotating side is grouped so as not to be short-circuited at the wiring part 9, and is passed through the hollow part of the rotating shaft member 8.

The connector section 10 is an aluminum member having a hollow inside, and has a mounting screw 10
a, 10b attached to the outer wall of the second housing member 4. The wiring of each coil of the second ferrite core coil unit 7 on the stationary side is grouped so as not to be short-circuited at the wiring part 11, and is passed through the hollow part of the connector part 10.

Next, the ferrite core coil unit in this embodiment will be described in detail.

The first ferrite core coil unit 6
The second ferrite core coil unit 7 includes a ferrite core 20 shown in FIGS. 2A and 2B, respectively. The ferrite core 20 is obtained by hardening a ferrite powder and a binder in a mold by pressure and heat treatment, and is formed in a large diameter pot having a diameter of 20 cm. However, unlike a general pot-type ferrite core, it has a structure in which a plurality of concentric partition walls 20a are provided so that a plurality of coil storage paths 20b are formed concentrically. In the present embodiment, the coil storage path 20b
As a result, eight independent coil accommodating paths 20b were formed. The same ferrite core 20 is used for the first ferrite core coil unit 6 and the second ferrite core coil unit 7, and the diameter of the coil accommodating path 20b and the radial width of each ferrite core 20 are equal. To be.

As shown in FIGS. 3 and 4, a formal wire 21 is wound around the coil housing path 20b a predetermined number of times, for example, about 30 times, as an air core coil. The formal wire 21 may be housed directly in the coil housing path 20b and fixed with an adhesive. However, after winding the formal wire around a bobbin (not shown), the bobbin is housed in the coil housing path 20b. You may do it.

Then, the ferrite core coil units 6 and 7 formed by accommodating the formal wires 21 in the ferrite core 20 are connected to the above-described support plates 5a and 5a.
5b is attached using a two-part epoxy adhesive that can be adhered at a low temperature, and as shown in FIG. 3, they are arranged to face each other with a predetermined core gap. In the present embodiment, the core gap is set to 0.5 to 1 mm. In the case where the ferrite core coil unit is bonded to the support plate using a high-temperature adhesive, cracks and the like may occur in the pot-type ferrite core 20 which is a fired product during cooling. In the form, it can be bonded at low temperature,
Such cracks and the like do not occur.

The pot type ferrite core 20 used in the present embodiment has a high surface processing accuracy and a high dimensional accuracy so that the leakage of magnetic flux can be reliably prevented even when used in an overlapping manner. Therefore, even when the ferrite core coil units 6 and 7 each composed of the pot type ferrite core 20 are mounted on the support plates 5a and 5b and opposed to each other, the height from the support plates 5a and 5b to the surface of the ferrite core 20 is maintained. Can be evenly aligned. As a result, the second
Even when the ferrite core coil unit 7 is set to the primary side and the first ferrite core coil unit 6 is set to the secondary side and coaxially opposed as shown in FIG. 3 and relatively rotated, the gap between them is kept constant. It is possible to keep.

Further, since the support plates 5a and 5b are made of non-magnetic stainless steel as described above, they do not generate heat even when the magnetic flux changes, and the ferrite core coil units 6 and 7 can be used. There is no detachment from the support plates 5a, 5b.

Further, in the present embodiment, the stationary second ferrite core coil unit 7 is set as the primary side, and the biferrule is provided in the coil housing portion 20b of the pot type ferrite core 20 constituting the second ferrite core coil unit 7. The wound air core coil 21 is mounted. Further, a normally wound air core coil 21 is mounted in the coil housing portion 20b of the pot type ferrite core 20 constituting the second side ferrite core coil unit 7 on the secondary side.

In the above configuration, when the deformed high-frequency voltage is applied to the coils 21 stored in the respective coil storage sections 20b from the stationary side via the wiring section 11 with reference to the pulse-like waveform, 4 around each coil 21
A magnetic flux is generated as shown in FIG. 3 and this magnetic flux passes through the inside of the ferrite core 20 of the stationary-side ferrite core coil unit 7 and further rotates.
Pass through the inside of the ferrite core 20. Thus, an electromotive force is generated in the coil 21 of the ferrite core coil unit 6 on the rotating side by the principle of mutual induction (electromagnetic induction), and power is transmitted.

Further, a ripple-shaped power supply fluctuation occurs on the rotating side. In this embodiment, the ripple-shaped power supply fluctuation is rectified and adjusted to a predetermined power supply voltage by a DC / DC converter or the like.

In this case, as shown in FIG. 5A, when the primary and secondary coils are normally wound, the primary side signal is turned on / off, and as shown in FIG.
The power is transmitted at a frequency around z, but in this case, the ratio of the stop time is high, and the transmission efficiency is deteriorated.

Therefore, in the present embodiment, FIG.
As shown in (A), the primary side is bi-ferrule wound,
By making the secondary side a normal winding, the primary side is alternately turned on and off alternately, as shown in FIG.
As a frequency around kHz, the secondary side synthesizes the frequency to increase the efficiency.

In order to obtain a desired induced electromotive force in a configuration in which a gap is provided between the stationary-side ferrite core coil unit 7 and the rotating-side ferrite core coil unit 6 in such a manner as described above, the desired induced electromotive force is required. It is important to set the size of the gap and the size of the deviation between the center axes to appropriate values.

In this embodiment, since the power transmission coupler is constituted by the ferrite core coil unit as described above, efficient power transmission can be performed in a non-contact manner. Supply can be performed stably for a long time. In particular, the ferrite core 20 has eight independent coil storage paths 20b
Is provided, and the interval between adjacent coil storage paths is sufficiently ensured by the partition wall 20a, so that power transmission of a plurality of channels can be performed well without being affected by each other.

For example, in the ferrite core coil unit of the present embodiment, the width W of the partition wall 20a shown in FIG.
Is sufficiently secured to be 5 mm, so that an annular magnetic flux A, as shown in FIG. 4, between the stationary-side ferrite core coil unit 7 and the rotating-side ferrite core coil unit 6.
Even when B and C are generated, interference of the magnetic fluxes A, B and C can be prevented, and power can be transmitted independently in each of the channels.

Therefore, power can be individually supplied to a plurality of solenoid valves, motors, and the like provided on the rotating side of the sheet feeding device in the printing apparatus as shown in FIGS. 16 and 17, for example. Such an individual power transmission can be performed by a power transmission rotary joint having an extremely slim shape as shown in FIG. As a result, the size of the device can be significantly reduced. In addition, the power transmission rotary joint of the present embodiment can transmit power in a non-contact manner, so that even when power is supplied to the rotating device, stable power can be supplied for a long period of time. It is possible. Moreover, since the power transmission rotary joint of the present embodiment can transmit power independently for a plurality of channels, it is extremely effective for an apparatus having a device that requires a plurality of power supplies as described above.

The excellent effects of the power transmission rotary joint 1 in the present embodiment as described above will be further clarified by comparing with the conventional power supply means.
For example, the most common example of the means for supplying power to the rotating body is a slip ring. However, since the slip ring has a large frictional resistance, the slip ring has a maximum frictional resistance such as the rotary joint of the present embodiment. 1000r
In a device that requires a rotational speed of as much as pm, it is not suitable because it hinders the increase of the rotational speed. In addition, the contact portion of the slip ring is worn out over a long period of use, so that periodic replacement is required.

On the other hand, since the power transmission coupler of the present embodiment is of a non-contact type, it has no frictional resistance and can easily increase the number of revolutions. In addition, since it is a non-contact type, there is no wear and no replacement work is required.

A configuration in which a battery is provided inside the rotating body is also conceivable, but such a configuration requires periodic battery replacement and charging.

On the other hand, the ferrite core coil unit for power transmission according to the present embodiment supplies power in a non-contact manner by using electromagnetic induction, so that there is no need to replace components.

When a slip ring is used,
Although cables for the number of signal points are required, and the routing becomes very complicated and difficult, according to the power transmission rotary joint 1 of the present embodiment, power transmission of a plurality of channels is performed in a non-contact manner by a pair of ferrite core coil units. Since it can be carried out, it is not necessary to lay the cable in the conventional manner, and the assembling work and the handling work can be performed very easily.

<Example> Next, an example in which the power transmission rotary joint 1 according to the present embodiment is applied to a printing apparatus as shown in FIGS. 16 and 17 will be described with reference to FIGS. 7 and 8. explain. Note that items described in the conventional example are omitted to avoid duplication.

In the printing apparatus, the ON / OFF of the solenoid valve
It is necessary to transmit power from the stationary side to the rotating side for turning off and driving the motor, and also to transmit a control signal. Therefore, in this embodiment, by connecting the rotary joint 12 for signal transmission to the rotary joint 1 for power transmission, both the power supply and the control signal are transmitted from the stationary side to the rotating side.

Rotary joint 12 for signal transmission
The first casing member 13 made of aluminum containing the first antenna element member 15 is attached to the hollow center shaft portion 17 of the second casing member 14 containing the second antenna element member 16 by a bearing 18. That is, a signal is transmitted in a non-contact state while rotating.

The hollow center shaft 17 of the rotary joint 12 for signal transmission is connected to the rotary shaft member 8 of the rotary joint 1 for power transmission described in the first embodiment.
The power transmission and the signal transmission to a rotating system such as a printing device can be performed in a completely non-contact state by firmly connecting with a mounting screw 8c.

That is, the second housing member 4 of the rotary joint 1 for power transmission and the first casing member 13 of the rotary joint 12 for signal transmission are stationary, and the hollow center shaft of the rotary joint 12 for signal transmission is stationary. By connecting the unit 17 to a rotating system such as a printing device, the rotating force of the rotating system is transmitted to the second casing member 14, and the rotating ferrite core coil unit 6 is further rotated via the rotating shaft member 8. Will be done.

The wiring portion 9 of the ferrite core coil unit 6 on the rotating side passes through the hollow center shaft portion 17 of the rotary joint 12 for signal transmission and is connected to the printing device or the like.

When the rotary joint for power transmission and the rotary joint for signal transmission are used together as described above, the connection between them is close to each other. Is set to 12 kHz, for example, and the carrier frequency between the antenna elements in the rotary joint for signal transmission is set to 300 MHz, so that interference between power and signals can be prevented. Further, it is preferable that the antenna element for signal transmission has a filter function so that low frequencies do not pass.

Next, the rotary joint 1 for power transmission and the rotary joint 1 for signal transmission
2 is connected to the paper feeder of the printing apparatus as shown in FIG. 16 to 18 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 8, first, an air supply rotary joint 71 is screwed into the shaft end 53a of the rotary shaft 53 on the paper feeder side, and then the signal is attached to the air supply rotary joint 71. The transmission rotary joint 12 is connected, and the power transmission rotary joint 1 is further connected.

With this configuration, when the shaft end 53a and the rotating shaft 53 are driven to rotate by the rotation of the motor 58, the air rotary joint 71 connected thereto is rotated.
Of the rotary joint 12 for signal transmission is rotated in conjunction with the rotation of the rotating part 71a, and the rotation central shaft 8 of the rotary joint 1 for power transmission and the ferrite core on the rotating side are rotated. Coil unit 6
Will rotate.

The rotary shaft 71a of the rotary joint 71 for supplying air of the present embodiment is formed in a hollow shape, and the hollow portion forms an air supply path. In addition, a hollow wiring path for power supply wiring and signal wiring is formed separately from the air supply path on the rotary shaft 71a, and a wiring section from the power transmission rotary joint 1 and a signal transmission A portion provided from the rotary joint 12 is connected to the paper feeder through the rotary shaft portion 71a.

With this configuration, not only a power supply and a signal transmission path are formed, but also the air supply port at the tip end 71c of the air rotary joint 71 communicates with the tube 70 of the printing apparatus, and Is formed.

Therefore, a plurality of input signals output from the paper feeder are transmitted by the transmission unit 82 via the parallel / serial converter 83, and are transmitted to the vicinity of the sequencer 69 by the coaxial cable 73 connected to the transmission unit 82. Is transmitted to the receiving unit 81 provided in the. Therefore, the output signal from the transmitting unit 83 is wirelessly transmitted by the antenna unit of the rotary joint 1, transmitted to the receiving unit 81, and supplied to the sequencer 69 via the serial / parallel converter 80.

The wiring section 74 for power supply passes through the rotary joint 1 for signal transmission and the rotary joint 71 for air supply, passes through the hollow portion of the shaft end 53a and the hollow portion of the rotary shaft 53, and supplies power. Connected to the paper device side. Thereby, the power supplied from the power transmission unit is supplied to the sheet feeding device by the power transmission rotary joint 1.

Then, the air rotary joint 71
Is directly passed through the inside of the straight pipe member 2, further passes through the hollow portion 72 c of the slip ring 72, and is supplied to the tube 70.

As described above, by using the rotary joint 1 of the present embodiment, not only signal transmission and compressed air supply to a device having a rotating unit, but also
Power can be supplied satisfactorily. In addition, the size of the entire device can be reduced.

In the present embodiment, the housing members 2 and 4 of the power transmission rotary joint 1 are made of aluminum. However, the present invention is not limited to this. Can be used as long as the material has a high thermal conductivity.

In this embodiment, a case where a power coupler having no hollow portion is used has been described. However, a hollow portion may be provided at the center of the power coupler. In this way, various connections of the rotary joint can be made.

Further, in the present embodiment, an example is described in which the rotary joint of the present invention is applied to a paper feeder of a printing apparatus. However, the present invention is not limited to this, and a rotary unit and a stationary unit may be used. It can be widely applied to a device that transmits power from the stationary unit side to the rotating unit side.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. In addition,
The same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, a ferrite core is used as shown in FIG.
A plurality of semi-cylindrical split ferrite cores 30 as shown in FIG. 10 are arranged on the support plates 5a and 5b, and the air-core coil 3 is placed in the central recess 30a of the split ferrite core 30.
1 is attached. The intervals between the ferrite cores 30 are set at substantially equal intervals. In addition, each ferrite core 30
Are arranged such that the central concave portion 30a forms a plurality of concentric coil housing portions.

The semi-cylindrical split type ferrite core 30 used in this embodiment is generally used for a clamp filter used for shielding a cable.
When used for a clamp filter, as shown in FIG. 10A, two semi-cylindrical divided ferrite cores 30 are used.
Use in combination. Semi-cylindrical split ferrite core 30 used in such a clamp filter
As shown in FIG. 10A, since it is necessary to surely prevent the leakage of magnetic flux when they are aligned as shown in FIG. 10A, the processing accuracy of the surface is high and the dimensional accuracy is high. Therefore, as shown in FIG. 9, even when each of the split ferrite cores 30 is annularly arranged on the support plates 5a and 5b, the heights from the support plates 5a and 5b can be made uniform. As a result, even when the second ferrite core coil unit 7 is set to the primary side and the first ferrite core coil unit 6 is set to the secondary side, they are coaxially opposed as shown in FIG.
It is possible to keep the gap between them constant.

The support plates 5a of the split type ferrite core 30
For attachment to 5b, a two-part epoxy adhesive that can be adhered at a low temperature was used. When an adhesive that bonds at a high temperature is used, cracks and the like may occur in the divided ferrite core 30 that is a fired product at the time of cooling. However, in the present embodiment, the split ferrite core 30 can be bonded at a low temperature. Such cracks and the like do not occur.

Further, since the supporting plates 5a and 5b are made of non-magnetic stainless steel as described above, they do not generate heat even if a change in magnetic flux occurs, and the split type ferrite core 30 is supported by the supporting plates 5a and 5b. There is no separation from 5a, 5b.

As described above, the split type ferrite core 30 annularly arranged on the support plates 5a and 5b has the structure shown in FIG.
As shown in FIG.
A central recess 30a penetrating from b to the other end surface 30c is formed. By arranging the split type ferrite cores 30 in an annular shape as shown in FIG. 9, the coil accommodating path including the central concave portion 30a is formed in an annular shape, and the coil 31 is mounted in the accommodating path. In the present embodiment, the stationary side second
The ferrite core coil unit 7 is set as the primary side, and a biferral wound air core coil 31 is mounted in the central recess 30a of the split ferrite core 30 constituting the second ferrite core coil unit 7. A normally wound air-core coil 31 is mounted in the central recess 30a of the split ferrite core 30 that forms the first ferrite core coil unit 6 on the secondary side, the rotating side.

The power transmission is performed in a non-contact manner based on the principle of mutual induction (electromagnetic induction), but the stationary side is configured to transmit a deformed high-frequency signal based on a pulse-like waveform. On the other hand, on the rotating side, the ripple-like power supply fluctuation is rectified and adjusted to a predetermined power supply voltage by a DC / DC converter or the like.

Also in this embodiment, the primary side is bifilar wound and the secondary side is normally wound, so that the primary side is turned on / off alternately, and the 30 k
As a frequency of around Hz, the secondary side synthesizes this to increase the efficiency.

In this embodiment, the split type ferrite core 3
By mounting the air-core coil 31 wound about 30 turns in the center recess 30a of 0, power transmission by the principle of mutual induction as described above is enabled. Air core coil 31
A so-called alcohol fusion wire, in which a surface of a coil formed of a copper wire is coated with a resin that melts with methyl alcohol, is used. In the present embodiment, the alcohol fusion wire is wound by a winding device for about 30 turns and then immersed in methyl alcohol. This allows
The resin coated on the surface of the coil is melted, and the entire air-core coil 31 is solidified. The air core coil 31 thus hardened is bonded to the central recess 30a with an epoxy adhesive. Therefore, the air-core coil 31
Presses down the whole of the split type ferrite core 30 as shown in FIG.
a, 5b.

As described above, in the present embodiment, a split type ferrite core is used as the ferrite core, and the space between adjacent cores is made as small as possible. Position, so that even if the primary side ferrite core coil unit and the secondary side ferrite core coil unit are arranged with a minute gap, it is possible to prevent Power transmission is possible. as a result,
Power supply from the stationary side to the rotating side can be easily realized. Also, by using the above-mentioned split type ferrite core, it is possible to configure a rotary joint for power transmission at low cost.

Further, in this embodiment, an example has been described in which the number of ferrite cores in the primary side and the secondary side ferrite core coil units is the same, but the present invention is not limited to this. The number of ferrite cores may be changed between the side and the secondary side.
With this configuration, the amount of leakage of the magnetic flux can always be made uniform irrespective of the change in the relative position of the ferrite core, and the induced electromotive force generated can be made more uniform. Therefore, it is possible to transmit a power source with even less ripple.

Further, the present invention is not limited to the configuration using the split type ferrite cores 30 having the same length on the rotating side and the stationary side, but the split type ferrite cores having different lengths on the rotating side and the stationary side. A configuration using the core 30 may be used. Even in such a configuration, even if the relative positions of the split ferrite cores 30 change, the amount of magnetic flux leakage can always be made uniform, and the generated induced electromotive force can be made more uniform. can do. Therefore, it is possible to transmit a power source with even less ripple.

Note that the split ferrite core applicable to the present invention is not limited to a semi-cylindrical core, and is not limited to the one shown in FIG.
An E-shaped ferrite core 32 as shown in FIG. 11A or an existing U-shaped split ferrite core 33 as shown in FIG. 11B can be used. Further, a ferrite core having such a shape that no gap is formed when the split type ferrite core is annularly arranged may be newly manufactured. By doing so, the transmission efficiency can be further improved.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the first embodiment, the ferrite core coil unit on the primary side and the ferrite core coil unit on the secondary side are arranged so as to face each other in a non-contact manner and rotate relatively. In this example, the primary-side ferrite core coil unit 7 and the secondary-side ferrite core coil unit 6 described in the first embodiment are brought into close contact with each other as shown in FIG. That is, in the present embodiment, as shown in FIG. 12, the ferrite core coil unit 7 on the primary side and the ferrite core coil unit 6 on the secondary side are brought into close contact with each other, and an adhesive is applied to the joint and solidified. For example, it is attached to a device that requires power supply using a holder or the like, and power is transmitted from the stationary unit to the stationary unit.

Even in such a power transmission in a stationary system, the power transmission device of the present invention has a configuration in which power can be transmitted in a non-contact manner and independently on a plurality of channels. , And efficient power transmission is possible over a long period of time. In addition, by appropriately designing the diameter of the coil and appropriately setting the number of turns, it is possible to transmit a power supply that requires a desired large current.

When the power transmission device is fixedly used as described above, the shape of the ferrite core, the shape of the coil housing path, and the shape of the partition wall need not be annular as in the first embodiment. .

For example, as shown in FIG. 13, a ferrite core 22 having an elliptical partition wall 22b and an elliptical coil storage passage 22a may be used. Further, as shown in FIG. 14, a ferrite core 23 having a rectangular partition wall 23b and a rectangular coil housing path 23a may be used. Further, as shown in FIG.
Alternatively, a ferrite core 24 having a triangular coil housing path 24a may be used. As described above, when the power transmission device is fixedly used, ferrite cores having various shapes can be used.

Also in the present embodiment and the other embodiments described above, the number of channels, that is, the number of coil accommodating paths is not limited to a specific number, but can be appropriately set according to the necessity of power supply. is there.

[0115]

As described above, according to the ferrite core according to the first aspect, the endless coil storage recesses formed in the core member made of ferrite material have different storage path lengths, and the storage path lengths are different. Is surrounded by a coil storage recess having a long storage path length, and provided at a plurality of locations so as to form a partition wall having a predetermined width between the coil storage recesses. Power transmission.

According to the ferrite core of the present invention, the coil accommodating recess is formed in an annular shape, and the coil accommodating portions are provided at a plurality of locations so as to be located concentrically. Even if it is arranged on both the side and the rotation side and arranged to be relatively rotatable relative to each other, regardless of the change in the relative position of each ferrite core,
The power transmission of a plurality of channels with extremely little magnetic flux leakage is always possible in the same state.

According to the third aspect of the ferrite core coil unit, since the air-core coils are housed in the respective coil housing recesses of the ferrite core according to the first or second aspect, each of the air-core coils has By supplying current thereto, power can be transmitted independently of each other, and power can be transmitted through a plurality of channels with very little magnetic flux leakage without causing interference between adjacent channels.

According to the ferrite core coil unit of the fourth aspect, annular coil storage paths having different storage path lengths are formed by the recesses of the divided ferrite cores, and the respective coil storage paths are provided concentrically. As described above, the split type ferrite cores were mounted side by side in the circumferential direction and the radial direction on the surface of the support member, and the air-core coils were stored in each of the coil storage paths.
With a simple configuration, it is possible to transmit power to a plurality of channels with extremely low magnetic flux leakage without causing interference between adjacent channels.

According to the ferrite core coil unit of the present invention, since the semi-cylindrical ferrite core is used as the split ferrite core, the split ferrite core can be easily mounted on the supporting member in the circumferential direction and the radial direction. It is also possible to form a large-diameter ferrite core coil unit having a plurality of coil storage paths.

According to the ferrite core coil unit of the sixth aspect, since the U-shaped ferrite core is used as the split type ferrite core, the split type ferrite core can be easily mounted on the supporting member in the circumferential direction and the radial direction. It is also possible to form a large-diameter ferrite core coil unit having a plurality of coil storage paths.

According to the ferrite core coil unit of the present invention, since the E-shaped ferrite core is used as the split ferrite core, the split ferrite core can be easily mounted on the supporting member in the circumferential direction and the radial direction. It is also possible to form a large-diameter ferrite core coil unit having a plurality of coil storage paths.

According to the ferrite core coil unit of the present invention, since the height from the surface of the support member supporting the ferrite core to the surface of the ferrite core is substantially constant, these ferrite core coil units can be mounted at a predetermined height. When facing each other with a gap, the gap can be maintained at a predetermined value throughout the divided ferrite cores arranged in the circumferential direction and the radial direction. Can be reliably prevented. Further, since the gap is maintained at a predetermined value everywhere even when the ferrite core coil units are relatively rotated with each other, the predetermined gap can be miniaturized. Therefore, the efficiency of power transmission can be improved. Furthermore, when the ferrite core coil units are brought into contact with each other, no gap is formed at the contact portion, and the degree of adhesion is improved, so that the leakage of magnetic flux can be significantly reduced, and the power transmission can be performed extremely efficiently. It can be performed.

According to the ferrite core coil unit of the ninth aspect, since the support member of the ferrite core is formed of a non-magnetic member, the magnetic flux does not pass through the support member, and the heat generation due to the change in the magnetic flux can be reliably achieved. Can be prevented.

According to a tenth aspect of the present invention, there is provided the ferrite core coil unit according to any one of the third to ninth aspects, wherein the lengths and widths of the coil accommodating paths are substantially the same. A pair of ferrite core coil units are provided, and the pair of ferrite core coil units are overlapped so that the air-core coils housed in the respective coil housing paths face each other. Power transmission can be performed in a state where leakage is extremely small, and efficient power transmission can be performed. In addition, since these power transmissions can be performed independently in a plurality of power transmission channels each including an air core coil and a surrounding ferrite core, even when power transmission is performed independently in many places. ,
It is possible to provide a power transmission device that does not require a cable or the like and is extremely easy to handle. Further, since the transmission of these power supplies is performed in a non-contact manner, there is no wear of the contacts, and the transmission can be performed satisfactorily for a long time.

[0125] According to the power transmission device of the eleventh aspect, the ferrite core coil unit according to any one of the third to ninth aspects, wherein the lengths and widths of the coil accommodating paths are substantially the same. A pair of ferrite core coil units, and the pair of ferrite core coil units are arranged so that the ferrite core coil units face each other coaxially with a predetermined gap and are rotatable relative to each other. Therefore, although there is an air gap, power transmission can be performed in a state where leakage of magnetic flux is extremely small using the ferrite core as a magnetic path, and efficient power transmission can be performed. In addition, since these power transmissions can be performed independently in a plurality of power transmission channels each including an air core coil and a surrounding ferrite core, even when power transmission is performed independently in many places. It is possible to provide a power transmission device that does not require routing of cables and the like and is extremely easy to handle. Further, since the transmission of these power supplies is performed in a non-contact manner, there is no wear of the contacts, and the transmission can be performed satisfactorily for a long time. In particular, since a plurality of independent power supplies can be supplied from the stationary side to the rotating side, a power transmission device that is extremely excellent in ease of handling and durability as compared with the case where a slip ring is used. Can be provided.

According to the rotary joint of the twelfth aspect, the ferrite core coil unit according to any one of the third to ninth aspects is provided on each of the first housing member and the second housing member. And a ferrite core coil unit having substantially the same coil storage path length and width with each other, wherein each of the ferrite core coil units is connected to each other in the first housing member and the second housing member. Since the units are coaxially opposed to each other with a predetermined gap and arranged so as to be rotatable relative to each other, there is an air gap, but the ferrite core is used as a magnetic path and the leakage of magnetic flux is extremely small. Power transmission can be performed, and efficient power transmission can be performed. In addition, since these power transmissions can be performed independently in a plurality of power transmission channels each including an air core coil and a surrounding ferrite core, even when power transmission is performed independently in many places. It is possible to provide a rotary joint that does not require the routing of cables and the like and is extremely easy to handle. Further, since the transmission of these power supplies is performed in a non-contact manner, there is no wear of the contacts, and the transmission can be performed satisfactorily for a long time. In particular, a plurality of independent power supplies are supplied from the stationary side to the rotating side, so that the rotary power transmission rotary shaft is extremely easy to handle and durable compared to the case where a slip ring is used. Joints can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a power transmission rotary joint according to a first embodiment of the present invention.

2A is a plan view showing a ferrite core used in the power transmission rotary joint of FIG. 1, and FIG. 2B is a cross-sectional view of FIG.

FIG. 3 is a sectional view showing a ferrite core coil unit used in the power transmission rotary joint of FIG. 1;

FIG. 4 is a partially enlarged view of the ferrite core coil unit shown in FIG. 3;

FIG. 5A is a diagram showing an example of a coil configuration in a transformer using electromagnetic induction as a comparative example, and FIG.
FIG. 4 is a diagram showing a current waveform in the coil configuration of FIG.

6A is a diagram illustrating an example of a coil configuration of the ferrite core coil unit illustrated in FIG. 3, and FIG. 6B is a diagram illustrating a current waveform in the coil configuration of FIG.

FIG. 7 is a partially sectional plan view showing a combination example of a power transmission rotary joint and a signal transmission rotary joint according to an embodiment of the present invention.

8 is a partial cross-sectional plan view showing the periphery of a sheet feeding device of a printing apparatus to which the rotary joint for power transmission and the rotary joint for signal transmission shown in FIG. 8 are attached.

FIG. 9 is a plan view illustrating a ferrite core coil unit according to a second embodiment of the present invention.

FIGS. 10A and 10B are views showing a split type ferrite core used in a ferrite core coil unit according to a second embodiment of the present invention, wherein FIG. 10A is a perspective view showing the split type ferrite core, and FIG. (A) is a side view of the split type ferrite core viewed from one end face 30a side, and (C) is a side view showing a state in which an air-core coil 31 is mounted in the central recess 30a of the split type ferrite core (A).

FIG. 11 is a view showing various ferrite cores;
(A) is a figure which shows an E-shaped ferrite core, (B) is a figure which shows a U-shaped ferrite core.

FIG. 12 is a perspective view showing a fixed power transmission device according to a third embodiment of the present invention.

FIG. 13 is a plan view showing an elliptical ferrite core that can be used in the fixed power transmission device of the present invention.

FIG. 14 is a plan view showing a square ferrite core that can be used in the fixed power transmission device of the present invention.

FIG. 15 is a plan view showing a triangular ferrite core that can be used in the fixed power transmission device of the present invention.

FIG. 16 is a perspective view illustrating a schematic configuration of a sheet feeding device in a conventional printing apparatus.

FIG. 17 is a detailed view showing the periphery of a roll supporting portion of the sheet feeding device of FIG.

FIG. 18 is a partial cross-sectional view of the periphery of a rotation shaft end of the roll support unit of FIG. 17;

FIG. 19 is a cross-sectional view showing a schematic configuration of a conventional signal transmission rotary joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotary joint for power transmission 2, 4 ... Housing member 5a, 5b ... Support plate 6 ... Rotation side ferrite core coil unit 7 ... Stationary side ferrite core coil unit 20, 22, 23, 24 ... Ferrite core 20a, 22a, 23a , 24a ... partition walls 20b, 22b, 23b, 24b ... coil accommodating paths 21, 31 ... air-core coils 30 ... split ferrite cores 32 ... E-shaped ferrite cores 33 ... U-shaped ferrite cores

Claims (12)

[Claims] 1. A core member formed of a ferrite material,
An endless coil accommodating concave portion in which the entire air-core coil is embedded and accommodated, wherein the coil accommodating concave portion has a different accommodating path length,
A coil storage recess having a short storage path length is surrounded by a coil storage recess having a long storage path length, and is provided at a plurality of locations so as to form a partition wall having a predetermined width between the coil storage recesses. And ferrite core. 2. The coil accommodating concave portion is formed in an annular shape, and is provided at a plurality of locations so that each coil accommodating portion is located concentrically.
The ferrite core described in 1. 3. The ferrite core coil unit according to claim 1, wherein an air-core coil is housed in each of the coil housing recesses in the ferrite core according to claim 1. 4. A ferrite core having a plurality of split ferrite cores each having a recess penetrating from one end face to the other end face, a support member for the split ferrite core, and an air-core coil. Forming annular coil storage paths having different lengths, so that the respective coil storage paths are provided concentrically, the divided ferrite cores are mounted side by side in the circumferential direction and the radial direction on the support member surface, The ferrite core coil unit, wherein the air-core coil is stored in each of the coil storage paths. 5. The ferrite core unit according to claim 4, wherein the split ferrite core is a semi-cylindrical ferrite core. 6. The ferrite core coil unit according to claim 4, wherein the split ferrite core is a U-shaped ferrite core. 7. The ferrite core coil unit according to claim 4, wherein the split type ferrite core is an E-shaped ferrite core. 8. The ferrite core coil unit according to claim 4, wherein a height from a surface of the support member to a surface of the ferrite core is substantially constant. . 9. The ferrite core coil unit according to claim 4, wherein the support member is formed of a non-magnetic member. 10. The ferrite core coil unit according to claim 3, comprising a pair of ferrite core coil units having mutually the same coil storage path length and width. A power transmission device, wherein a pair of ferrite core coil units are overlapped such that air core coils housed in respective coil housing paths face each other. 11. The ferrite core coil unit according to claim 3, comprising a pair of ferrite core coil units having substantially the same coil storage path length and width. A power transmission device, comprising: a pair of ferrite core coil units facing each other so that the ferrite core coil units have a predetermined gap on the same axis and being rotatable relative to each other. 12. A first housing member attached to or integrally formed with a rotating shaft, and a second housing member rotatably attached to the first housing member by a bearing. The ferrite core coil unit according to any one of claims 3 to 9, wherein each of the first housing member and the second housing member has a coil housing path length and width of each other. A ferrite core coil unit that is substantially the same, wherein each of the ferrite core coil units is such that the ferrite core coil units in the first housing member and the second housing member have a predetermined gap on the same axis. A rotary joint opposed to each other and arranged to be rotatable relative to each other. .