JP3138150U - Electromagnetic clutch - Google Patents

Abstract

It is possible to rotate a rotating hub easily and surely by human power, and it is possible to rotate them without providing a dedicated manual rotation mechanism for an output shaft, an input shaft, etc. To provide an electromagnetic clutch capable of reducing the number of parts of devices such as printers and copiers.
An electromagnetic clutch (1) is provided coaxially and rotatably when an electromagnetic coil (10) built in a field core (11) is energized or de-energized to attract or dissociate the field core (6). In an electromagnetic clutch in which the rotary hub 4 and the rotary shaft 2 are connected or released with one of them as an input part and the other as an output part, the manual drive part is connected to the rotary hub and manually drives the rotary hub. 5 is provided.
[Selection] Figure 2

Description

  The present invention relates to an electromagnetic clutch, and more specifically, the field core and the armature are adsorbed or dissociated by energization or non-energization of an electromagnetic coil built in the field core, and are provided coaxially and rotatably. The present invention relates to an electromagnetic clutch in which either one of an input part and an output part is connected to or released from a rotating hub and a rotating shaft.

  In office automation equipment such as printers and copiers, for example, an electromagnetic clutch is incorporated in a mechanism portion for transporting paper and the like, and functions such as transmission / non-transmission of conveyance power.

  Here, there exists the electromagnetic clutch 100 of patent document 1 as an example of the conventional electromagnetic clutch (FIG. 4). The electromagnetic clutch 100 includes a field core 114 having a built-in electromagnetic coil 110, a rotating shaft rotatably inserted in the electromagnetic coil, a rotor 120 fixed to the rotating shaft so as to be rotatable integrally with the rotating shaft, On the opposite side to the electromagnetic coil across the rotor, there is a rotating hub 126 that is rotatably inserted on the rotating shaft, and an end surface that is externally fitted on the rotating shaft and faces the rotor 120 of the rotating hub 126. And an armature 122 attached thereto.

JP 2004-138173 A

  In recent office automation equipment such as printers and copiers, there is an increasing demand for further miniaturization and thinning. On the other hand, for example, it is difficult to eliminate problems such as paper jamming in these devices. Therefore, the printers, copiers, etc., transport paper for the purpose of discharging jammed paper. A dedicated manual rotation mechanism such as a rotation handle or a rotation roller is provided on the conveyance shaft or the like.

  The present invention has been made in view of the above circumstances, and it is possible to rotate the rotating hub easily and surely by human power, and rotate them without providing a dedicated manual rotation mechanism on the output shaft, the input shaft, etc. An object of the present invention is to provide an electromagnetic clutch capable of reducing the number of parts of devices such as a printer and a copying machine to be incorporated.

  The present invention solves the above-mentioned problems by the solving means described below.

  The electromagnetic clutch according to the present invention is coaxially and rotatably provided by energizing or de-energizing the electromagnetic coil built in the field core so that the field core and the armature are adsorbed or dissociated, and either one is input. In an electromagnetic clutch in which a rotary hub and a rotary shaft, which are a part and an output part are connected or released, a manual drive part is provided which is connected to the rotary hub and manually drives the rotary hub. And

  Further, the manual drive unit includes a cylindrical part coaxial with the rotating hub, and an uneven part is formed on an outer peripheral surface of the cylindrical part.

  Further, the manual drive unit is formed in a cup shape having a bottom plate connected to the cylindrical part and opened to the opposite side of the rotating hub, and the armature is accommodated in the cylindrical part. .

  According to the first aspect, the operator can manually rotate the rotating hub connected to the manual drive unit by putting the finger on the manual drive unit or picking it with the finger. Thereby, it is possible to rotate the mechanism on the power input side or the mechanism on the power output side in the device in which the electromagnetic clutch is incorporated.

  According to the second aspect of the present invention, the concave and convex portions are provided on the outer peripheral surface of the cylindrical portion of the manual drive unit, and when the manual drive unit is to be rotated by human power, the problem that the finger does not slide is caused. Therefore, it is possible to reliably and easily rotate the manual drive unit and the rotating hub connected thereto.

  According to the third aspect, the armature and the rotor can be dissociated and adsorbed in the cylindrical portion partitioned by the bottom plate. Accordingly, it is possible to prevent power transmission failure due to slippage caused by the lubricating oil / grease applied to the gear portion of the rotating hub adhering to the respective adsorption surfaces of the armature and the rotor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing an example of an electromagnetic clutch 1 according to an embodiment of the present invention. FIG. 2 is a schematic view showing the configuration of the electromagnetic clutch 1, FIG. 2 (a) is a side view (upper half sectional view), and FIG. 2 (b) is a rear view. FIG. 3 is a schematic diagram showing another example of the manual drive unit 5 of the electromagnetic clutch 1 shown in FIG. In addition, regarding a code | symbol, the code | symbol 8 is used as a general term of the code | symbols 8a and 8b.

A general type of electromagnetic clutch is a rotating hub that serves as an input section and a rotation that serves as an output section when the field core and the armature are attracted or dissociated by energizing or de-energizing an electromagnetic coil built in the field core. As a power transmission member, the field core and the armature are adsorbed or dissociated by energizing or de-energizing the electromagnetic coil incorporated in the field core and the type called an electromagnetic micro-clutch that is connected to or released from the shaft. The intervening coil spring is tightened or released, and is roughly classified into a type called an electromagnetic spring clutch in which a rotating hub serving as an input portion and a rotating shaft serving as an output portion are connected or released. In any of the electromagnetic clutches, there is a usage mode in which the rotating shaft serves as an input unit and the rotating hub serves as an output unit, and a type having a mechanism corresponding thereto.
Furthermore, the electromagnetic micro-clutch is classified into a so-called single plate type and multi-plate type, and is subdivided into a dry type, a wet type, and the like. The electromagnetic spring clutch is subdivided into a so-called normal open type and normal close type.

  Any of the above-described types of electromagnetic clutches is common to the operation of connecting or releasing the rotary hub and the rotary shaft, one of which serves as an input part and the other serves as an output part. The clutch is not limited to any of the above types. Here, the electromagnetic clutch according to the embodiment of the present invention will be described by taking the type of a single-plate dry electromagnetic microclutch as an example.

  As shown in FIG. 2, the field core 11 has a double cylindrical structure including a field core inner tube portion (hereinafter referred to as “inner tube portion”) 11b and a field core outer tube portion (hereinafter referred to as “outer tube portion”) 11c. And it is provided with the end surface 11a of the field core which connects the inner cylinder part 11b and the outer cylinder part 11c in one end side, and is formed in the cross-sectional U-shape by which the other end side was opened. A bobbin (hereinafter referred to as “coil bobbin”) 14 of an electromagnetic coil is fitted and fixed in the space between the inner cylinder part 11b and the outer cylinder part 11c. The inner cylinder portion 11 b has an inner diameter slightly larger than the outer diameter of the rotor inner cylinder 3 a of the rotor 3, and the rotor inner cylinder 3 a is inserted so that the rotor 3 is rotatable with respect to the field core 11. Supported. Here, reference numeral 10 in the figure is an electromagnetic coil, and an electric wire (a copper wire as an example) is wound around the outer peripheral surface of the cylindrical portion of the coil bobbin 14 formed using a synthetic resin material having electrical insulation. Composed.

  As shown in FIG. 2, the rotating shaft 2 is fixed to the rotor 3 so as to be rotatable integrally with the rotor 3. The rotating shaft 2 is formed using a synthetic resin material, and has a large diameter portion 2a and a small diameter portion 2b. A groove 2c for a retaining ring 21 is formed on the outer peripheral surface of the end portion of the small diameter portion 2b. A flange portion 2d formed in an annular shape is formed on the end surface of the portion 2a. The axial movement of each component of the electromagnetic clutch 1 is restricted by the flange portion 2d and the retaining ring 21 fitted in the groove 2c.

  The outer diameter of the small diameter portion 2b of the rotating shaft 2 is formed to be slightly smaller than the inner diameter of the rotor inner cylinder 3a, and the small diameter portion 2b is inserted into the rotor inner cylinder 3a. The rotation shaft 2 has an insertion hole 2e formed in the axial direction at the center, and an output shaft (not shown) is inserted into the insertion hole 2e. The insertion hole 2e and the output shaft are formed in a D-shaped cross section (D cut portion 2f), so that the output shaft and the rotary shaft 2 can rotate together. In the present application, a term parallel to the longitudinal direction of the rotating shaft 2 is referred to as an “axial direction”, and a direction orthogonal to the axial direction is referred to as a “radial direction”.

  The rotor 3 is formed using a magnetic material (iron as an example). In this embodiment, as shown in FIG. 2, the rotor disk 3c is connected to the ends of the rotor inner cylinder 3a and the rotor outer cylinder 3b. The rotor inner cylinder 3a, the rotor outer cylinder 3b, and the rotor disk 3c may be formed integrally or separately. Further, the rotor disk 3c may be plate-shaped or dish-shaped, and may have a structure in which an opening portion, a cut portion, or the like is provided on the plate. The rotor 3 is fitted with the rotary shaft 2 and is configured to be rotatable together.

  Reference numerals 24 and 25 are bearings. In this embodiment, the bearing 24 is disposed between the field core 11 and the rotary shaft 2, and the bearing 25 is disposed between the coil bobbin 14 and the rotor 3. To do.

  Further, as shown in FIG. 2, the manual drive unit 5 includes a cylindrical portion 5a that is coaxial with the rotating hub 4. The bottom plate 5b is connected to one end of the cylindrical portion 5a, and the opening 5e is provided to the other end. It is formed into a cup shape. Further, the manual drive unit 5 is connected to the rotating hub 4 on the side opposite to the opening 5 e side. As an example, the manual drive unit 5 and the rotating hub 4 are integrally formed using a synthetic resin material, but may be configured so that they are formed separately and fitted.

  An armature 6 is attached to the inner bottom surface 5 c of the manual drive unit 5 so as to face the rotor disk 3 c of the rotor 3. At this time, the armature 6 is located on the opposite side of the electromagnetic coil 10 with the rotor 3 interposed therebetween. The inner bottom surface 5c refers to the inner surface of the bottom plate 5b that is cup-shaped. Here, as an example, the armature 6 is fixed to the inner bottom surface 5 c via the leaf spring 26, and the manual drive unit 5 (and the rotating hub 4) and the armature 6 can rotate together. The leaf spring 26 urges the armature 6 so that the armature 6 is separated from the rotor disk 3c when the energization of the electromagnetic coil 10 is stopped and the suction of the armature 6 by the electromagnetic coil 10 is released.

  Further, a circular hole having an inner diameter slightly larger than the outer diameter of the large-diameter portion 2a of the rotating shaft 2 is provided at the center of the bottom plate 5b, and the rotating shaft 2 is inserted through the circular hole.

  Thus, by providing the armature 6 in the cylindrical portion 5a of the manual drive unit 5 formed in the cup shape having the cylindrical portion 5a and the bottom plate 5b, the armature 6 is provided in the cylindrical portion 5a partitioned by the bottom plate 5b. And the rotor 3 are dissociated and adsorbed. As a result, even when lubricating oil is dropped or greased on the gear portion of the rotating hub 4, the lubricating oil / grease adheres to the adsorption surfaces of the armature 6 and the rotor 3 to cause slippage. It is possible to prevent power transmission failure due to the above.

  Here, as shown in FIG. 2, the coil bobbin 14 fitted in the field core 11 includes an engagement protrusion 15 erected in the radial direction. As an example, the coil bobbin 14 and the synthetic resin are integrally formed. With this configuration, the coil bobbin 14 and the field core 11 are fixed so as not to rotate in the circumferential direction. Furthermore, the engagement protrusion 15 is engaged and fixed to an apparatus-side engagement portion (not shown) in which the electromagnetic clutch 1 is incorporated.

  As shown in FIGS. 1, 2, etc., the end face 11 a of the field core is provided with a power connection hole 22 that penetrates the coil bobbin 14. The conducting wire 23 is pulled in through the power connection hole 22 to electrically connect the electromagnetic coil 10 and a power source (not shown).

  With the above configuration, when the electromagnetic coil 10 is energized, a magnetic circuit is formed in the field core 11, the rotor 3, and the armature 6. As a result, the armature 6 moves toward the rotor 3 against the urging force of the leaf spring 26 and is attracted to the rotor 3. Therefore, the rotational force input to the rotary hub 4 is transmitted to the rotor 3 via the armature 6 fixed to the manual drive unit 5, and further transmitted to the rotary shaft 2 and finally to the output shaft for output. The shaft rotates.

  When the electromagnetic coil 10 is de-energized again, the attracting force of the electromagnetic coil 10 with respect to the armature 6 can be lost. Therefore, the armature 6 moves to the inner bottom surface 5c side of the manual drive unit 5 due to the urging force of the leaf spring 26. Return to position. As a result, the rotation of the output shaft stops. By producing the above action, the input to the rotating hub 4 can be transmitted and not transmitted to the output shaft, and the electromagnetic clutch 1 can be used as a clutch mechanism.

  In addition, the electromagnetic clutch according to the present invention includes a manual drive unit 5, and the manual drive unit 5 can be directly rotated by human power, more specifically, as a person puts a finger or picks it with a finger. This makes it possible to rotate the rotating hub connected to the manual drive 5. Conventionally, the idea and problem of rotating the electromagnetic clutch itself by human power has never been present. Naturally, a manual drive unit is provided, and the rotary hub or rotary shaft of the electromagnetic clutch is rotated by the manual drive unit. There was no technical idea to make it happen. Therefore, some conventional electromagnetic clutches are provided with a similar cylindrical portion, but the outer peripheral surface is merely formed in a flat shape (see FIG. 4).

Furthermore, the uneven part 8 is formed on the outer peripheral surface 5d of the cylindrical part 5a of the manual drive part 5. As an example, the concave-convex portion 8 has an outer peripheral surface 5d such that a thin linear groove formed in the axial direction is adjacent to each other with an interval of the same width as that of the groove, as indicated by 8a in FIG. The structure provided in the whole perimeter is provided. On the other hand, as another example, as shown in 8b in FIG. 3, a recess having a width of about a human finger is adjacent to the entire periphery on the outer peripheral surface 5d with an interval having the same width as that of the recess. The structure to provide is also considered.
In this embodiment, the concavo-convex portion 8 is formed integrally with the cylindrical portion 5a. However, for example, the concavo-convex portion 8 is formed as a separate body such as a cap and is fitted to the cylindrical portion 5a. It is also conceivable to do so.

  Thus, by providing the uneven portion 8 on the outer peripheral surface 5d of the cylindrical portion 5a, when trying to rotate the manual drive unit 5 by human power, without causing the problem that the finger does not slip and rotate, The manual drive unit 5, that is, the rotating hub 4 can be rotated reliably and easily. As a result, when the rotating hub 4 rotates, for example, when the rotating hub 4 hits the input unit, a mechanism on the power input side (for example, a motor, an input gear, an input shaft, etc.) in a device in which the electromagnetic clutch 1 is incorporated. On the other hand, if the rotating hub hits the output section, it is possible to rotate the mechanism on the power output side (for example, output gear, output shaft, etc.) in the device in which the electromagnetic clutch 1 is incorporated. It becomes.

  By providing the above-described configuration, for example, in an OA device such as a printer or a copying machine, assuming an electromagnetic clutch that is incorporated in a mechanism portion that transports a sheet and performs a function of transmission / non-transmission of conveyance power and the like. Conventionally, when there is a problem of clogging, there is no idea to rotate the electromagnetic clutch itself, and other members (for example, a paper conveyance shaft (not shown)) that transmit paper conveyance power are used to transfer the paper. In the electromagnetic clutch according to the present invention, an electromagnetic clutch itself (manual drive unit) is provided to solve the problem by providing a rotating handle or a rotating roller for discharging the jammed paper by the operator rotating when the jam occurs. 5) can be rotated reliably and easily by hand, for manual rotation of a rotating handle or a rotating roller on the built-in equipment side. Without providing a structure, it is possible to discharge of the jammed paper.

More specifically, for example, when the rotating hub 4 hits the input unit, the electromagnetic coil 10 is energized to attract the field core 11 and the armature 6 and rotate the rotating hub 4 when removing the paper jam. At the same time, the rotation shaft 2, that is, the output shaft for carrying the paper can be rotated to prompt the discharge of the paper.
On the other hand, when the rotating hub 4 comes into contact with the output unit, when removing the paper jam, the electromagnetic coil 10 is de-energized, the field core 11 and the armature 6 are dissociated, and the rotating hub and the paper directly connected thereto It is possible to rotate the output shaft that is in charge of conveyance (an operation in a state where the electromagnetic coil 10 is energized to attract the field core 11 and the armature 6 is also conceivable).

  As described above, according to the electromagnetic clutch according to the present invention, a mechanism such as a rotary handle or a rotary roller provided for the purpose of discharging a jammed paper in a conventional printer, copying machine, or the like is omitted. This makes it possible to reduce the number of parts in office automation equipment such as printers and copiers, which are increasingly demanding miniaturization and thinning, enabling space saving, miniaturization and thinning. There is a remarkable effect that it can be realized. At the same time, manufacturing costs can be reduced.

  Needless to say, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the present invention. Further, although the electromagnetic micro clutch has been described as an example, it can be implemented as an electromagnetic spring clutch. In addition, when implemented as an electromagnetic spring clutch, the direction that can be rotated by human power may be defined in either one, by energizing or de-energizing the electromagnetic coil built in the field core as necessary, The field core and the armature are adsorbed or dissociated, the coil spring interposed as a power transmission member is wound or released, and the manual rotating part is moved while maintaining the connection or release state between the rotating hub and the rotating shaft. A mode of rotation is also conceivable.

It is the schematic which shows an example of the electromagnetic clutch which concerns on embodiment of this invention. It is the schematic which shows the structure of the electromagnetic clutch shown in FIG. It is the schematic which shows the other example of the manual drive part of the electromagnetic clutch shown in FIG. It is the schematic which shows an example of the electromagnetic clutch which concerns on the conventional embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 Rotating shaft 3 Rotor 4 Rotating hub 5 Manual drive part 5a Manual drive part cylindrical part 5b Manual drive part bottom plate 5c Manual drive part inner bottom face 5d Manual drive part outer peripheral face 6 Armature 8, 8a, 8b Uneven portion 10 Electromagnetic coil 11 Field core 14 Bobbin of electromagnetic coil (coil bobbin)
15 Engaging projection 21 Retaining ring

Claims (3)

The field core and the armature are adsorbed or dissociated by energization or de-energization of the electromagnetic coil built in the field core, so that one of them becomes an input part and the other becomes an output part. In the electromagnetic clutch where the rotating hub and rotating shaft are connected or released,
An electromagnetic clutch, characterized in that a manual drive unit connected to the rotary hub and manually driving the rotary hub is provided. The electromagnetic clutch according to claim 1, wherein the manual drive unit includes a cylindrical portion coaxial with the rotating hub, and an uneven portion is formed on an outer peripheral surface of the cylindrical portion. The manual drive part is formed in a cup shape having a bottom plate connected to the cylindrical part and opening to the opposite side of the rotating hub,
The armature is stored in the cylindrical portion;
The electromagnetic clutch according to claim 2.

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