JPS6043647B2 - electromagnetic solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electromagnetic solenoid suitable for driving a type cup or the like of a printing device such as an electronic typewriter.

Conventional configuration and its problems When moving a rotating object in the direction of its rotation axis, a mechanism that combines an electromagnetic solenoid and a link has conventionally been used.

FIG. 1 shows a printing section of a printing device, which has a mechanism for moving a rotating type cup up and down using an electromagnetic solenoid. In the figure, 10 is a platen that holds printing paper 11, 12 is a type cup, and on the outside of the tip of the spoke, type letters 14a and 14b are placed in upper and lower portions.
They are arranged in rows. A printing hammer 16 is arranged on the back side of the printing type characters 14a and 14b, and when a signal is input, the printing hammer 16 strikes the printing type 14a or 14b onto the printing paper 11. An ink ribbon 17 is located between the printed characters 14a or 14b and the printing paper 11, and printing is performed. The type cup 12 is fixed to a type holding member 18, and since the convex portion 19 of the type holding member 18 fits into a notch 15 formed in the bottom of the type cup 12, rotational movement can be transmitted. can. The type holding member 18 and the type cup 12 are supported on a rotating shaft 19a of a motor 19 so as to be rotatable and movable up and down. motor 19
A rotation transmission member 20 is fixed to the rotation shaft 19a of the motor 19, and the pin 21 fixed to the rotation transmission member 20 and the protrusion 22 of the type holding member 18 are connected to the rotation shaft 1 of the motor 19.
9a so that they can move in the longitudinal direction, rotation of the motor 19 is transmitted to the type cup 12 via the type holding member 18. 23 is an electromagnetic solenoid,
The movable iron core 24 is connected to one end of a shift lever 26 rotatably attached to a fixed portion by a pin 25.

The other end of the shift lever 26 is connected to the groove 1 of the type holding member 18.
A roller 27 that fits into 8a is rotatably attached. The vertical movement of the movable core 24 causes the type cup 12 to move up and down via the type holding member 18. The electromagnetic solenoid 23 has a yoke 28 that forms a magnetic path with the movable iron core 24,
A magnetic flux is generated in the magnetic path to move the movable iron core 24 to the yoke 28.
It consists of a coil 29 that attracts the movable iron core 29 and a guide vibe 30 that guides the movement of the movable iron core 24, and a coil spring 31 is attached to the movable iron core 24. heart 2
4 is moved upward and biased. The above conventional configuration requires a complicated mechanism to move the rotating type cup up and down, so it is not suitable for downsizing the device, and the friction force is large, causing rattling due to wear and other problems, resulting in poor reliability. I had a problem like this.

OBJECT OF THE INVENTION The object of the present invention is to provide an electromagnetic system that can directly move a rotating object, which is a driven body, in the axial direction, and that also has low friction and inertial loads, and that enables operation with low drive energy. The purpose is to provide solenoids.

Structure of the Invention The electromagnetic solenoid of the present invention includes a rotor including a magnetic body rotatably disposed on a shaft, a first position rotatably disposed on the shaft and spaced apart from the rotor by a predetermined distance, and the rotor. a movable core provided so as to be movable between a second position in contact with or close to the rotor, and a movable core provided so as to be movable between the rotor and the movable core so as to form a magnetic circuit including the rotor and the movable core, respectively. a yoke made of a magnetic material arranged so that at least a portion thereof is close to the yoke; a support member supporting the rotor and the movable iron core coaxially L and separated from the yoke by a predetermined distance; the rotor, the yoke, and the movable core; The yokes are configured such that they face the support member in parallel planes, and their opposing portions are symmetrical with respect to the support member. The type cup, etc. in the device can be rotated and supported movably in the longitudinal direction of its axis of rotation.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a side view of essential parts showing an embodiment in which the electromagnetic solenoid according to the present invention is used in a printing device.

In the figure, 40 is a platen that holds printing paper 41. 42 is a type cup, which has a plurality of spokes 44 vertically arranged at predetermined intervals from near the outer periphery of the disk portion 43.
is extended, and letters 45a and 45b are formed in two upper and lower stages at the outer tip of each spoke 44.

A gear 46 is formed on the outer periphery of the disk portion 43 of the type cup 42, and a gear 48 is fixed to the rotating shaft of a motor 47.
They are interlocked. Further, the disk portion 43 is provided with holes or notches 43a, and these holes or notches 43a
, there is a convex portion 5 such as a pin implanted in the type mounting member 49.
0 is inserted, so that the type mounting member 49 and the type cup 42 can rotate and move up and down as one unit.
An operating body 51a of a printing hammer 51 disposed on a fixed base 60 is located on the back side of the type 45a (or 45b).

When a signal is applied to the printing hammer 51, the actuating body 51a
is made to protrude to the right in FIG.
b) Push toward the printing paper 41. Then spoke 44
has an appropriate elastic force, so that the printed characters 45a (or 45b) are pressed against the printing paper 41. Between the type 45a (or 45b) and the printing paper 41. Ink ribbon 5
2 is provided, printing is performed. 47 is a motor for controlling the rotational position of the type cup 42;
The rotational position of this is controlled by a control circuit (not shown).

The gear 48 attached to the motor 47 is connected to the type cup 42.
The thickness is such that it maintains engagement with the gear 46 of the type cup 42 even when the type cup 42 is shifted in the vertical direction. 53 is an electromagnetic solenoid for vertically moving the type cup 42;
When a shift signal is input, the armature 54, to which the type mounting member 49 is attached to the lower end, is attracted and moved upward by electromagnetic force.

As a result, as shown in FIG. 2, the type cup 42 is lowered to a position (hereinafter referred to as the first position) such that the upper type type 45a faces the tip of the operating body 51a of the printing hammer 51. ), the actuating body 51a of the printing hammer 51
The position where the type cup 42 is raised so that the lower type type 45a faces the tip of the (hereinafter, this is referred to as the second position)
It will be brought to FIG. 3 is a cross-sectional view of an embodiment of the present invention that is effective when used as the electromagnetic solenoid 53. A shaft 6, which is a supporting member, is provided at the center of the fixed base 60.
1 is fixed to the shaft 61, and a cylindrical rotor 62 and a cylindrical armature 54, which is a movable iron core, are fixed to the shaft 61.
are supported in a vertical positional relationship. Rotor 62
is made of a magnetic material, and a helical bearing 63 is press-fitted into its center. Therefore, the rotor 62 can freely rotate on the shaft 61. Also,
Although the rotor 62 can also move in the axial direction, it normally rests on a flange portion 61a provided on the shaft 61 due to its own weight. The armature 54 is also made of magnetic material, and has slide bearings 55, 56 press-fitted into its central portion. Therefore, the armature 54 is connected to the shaft 61
It is rotatable at the top and movable along the length of the shaft. A coiled spring 64 is provided between the armature 54 and the flange portion 61a of the shaft 61, and the armature 5 is arranged so as to bring the type cup 42 to the first position.
4 is moved downward and biased. The armature 54 is stopped at a position where its lower end contacts an E-ring 65 attached to the shaft 61 by the biasing force of a coiled spring 64. In this position, the slider washer 66 is sandwiched between the underbelly bearing 56 and the E-ring 65, so the rotational resistance of the armature 54 is very small. The upper part 54a of the armature 54 is tapered, and the lower part of the rotor 62 facing the upper part 54a of the armature 54 has the same tapered recess 62a as the upper part of the armature 54.

Yokes 67 and 68 are made of a magnetic material and have substantially convex and concave cross sections, respectively, and are coupled to surround the coil 69.

The yoke 67 has a through hole 67a in its center that is large enough to accommodate the rotor 62 in a non-contact manner and to allow the upper part 54a of the armature 54 to enter and exit the recess 62a of the rotor 62 from below. The yoke 67
, 68, the inner circumferential portions 67a, 68a of the through holes 68 are provided with appropriate gaps 70,
He holds 71 and faces the opponent. Here, the gaps 70, 7
1, the rotor 62 and yoke 67, and the armature 54 and yoke 68 are connected to the shaft 6, respectively.
1, and their opposing portions are symmetrical with respect to the shaft 61.

When the coil 69 is energized, the yokes 68, 67 to the rotor 6
Magnetic flux is generated in the magnetic path formed by the armature 54, and the armature 54 is attracted to the rotor 62 by magnetic attraction.

The distance the armature 54 is moved is equal to the amount of shift of the type cup 42. FIG. 4 schematically shows the outline of the magnetic flux generated inside the electromagnetic solenoid 53 when the coil 69 is energized, and the magnetic flux is indicated by a broken line in the figure.

Since the magnetic flux passing through the gaps 70 and 71 is directed in the radial direction and is uniform over the entire circumference, no radial force is generated in the rotor 62 and armature 54. but,
The tapered upper part 54a of the armature 54 and the rotor 6
The magnetic flux passing through the gap G between the two tapered recesses 62a generates a force in the longitudinal direction of the shaft, compressing the coiled spring 64 and moving the armature 54 upward, so that the rotor 62 and the armature 54 are attracted to each other. The rotor 62 and armature 54 that are attracted to each other are connected to the coiled spring 6
The rotor 62 is attached to the collar portion 61a of the shaft 61 by the force of 4.
Since the type cup 42 stops at the position where it hits, the shifted position of the type cup 42 is always constant. Since there is no lateral pressure acting on the bearing even after adsorption, the rotational resistance of the armature 54 is extremely small. Further, after the attraction, the gap G becomes smaller and the magnetic resistance decreases, so the excitation force for maintaining the attraction of the armature 54 can be reduced. Since the suction portion of the armature 54 is tapered, a large excitation force is not required even at the suction start position where the gap G is large. When the coil 69 is de-energized, the armature 54 moves downward by its own weight and the action of the coiled spring 64, and waits at a position where its lower end touches the E-ring 65.

As described above, according to this embodiment, the armature connected to the type mounting member to which the type cup is attached can be moved up and down directly by magnetic force without contact.

Furthermore, the number of moving parts is reduced, reliability is improved, and the device can be made smaller. Further, since the rotational resistance when rotating the type cup is small and the load inertia is also small, effects such as a reduction in the load on the motor are produced. Effects of the Invention As is clear from the above description, the electromagnetic solenoid of the present invention rotatably supports a driven body, and supports the driven body with a supporting member (corresponding to the shaft 61 in the above embodiment).
Since the structure is such that the driven body is directly moved and displaced in the longitudinal direction, the driven body can be reliably driven with a simple and compact structure.

In addition, the rotor and movable core each face the yoke in a plane parallel to the support member, and the opposing parts are axially symmetrical, so when the movable core is attracted to the rotor, it will not receive thrust force. Moreover, the attraction force acting on the movable core and the rotor to the yoke is canceled, and no force is applied to the support member in the vertical direction.

Therefore, the frictional load during rotation is reduced, and when a driven body is rotated by a motor or the like, a small and inexpensive motor with low output can be used, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing a conventional electromagnetic solenoid and its application example, Fig. 2 is a partially cutaway side view showing an application example of the present invention, and Fig. 3 is an embodiment of the electromagnetic solenoid of the present invention. FIG. 4 is an enlarged side sectional view of a main part for explaining the operation of the embodiment. 53... Electromagnetic solenoid, 54... Armature, 61... Shaft, 62...
Rotor, 64... Coiled spring, 67, 68
...Yoke, 69...Coil.

Claims (1)

[Scope of Claims] 1. A rotor made of a magnetic material arranged to be rotatable, and a first position that is rotatable coaxially with the rotor and is spaced apart from the rotor by a required distance, and that contacts or contacts the rotor. a movable core that is movable between adjacent second positions; and at least a portion of each of the rotor and the movable core so as to form a magnetic circuit including the rotor and the movable core. a yoke made of a magnetic material arranged so as to be close to each other; a supporting member supporting the rotor and the movable iron core coaxially and separated from the yoke by a required distance; , magnetic flux generating means including at least a coil that generates a magnetic attraction force between the rotor and the movable iron core to move the movable iron core from the first position to the second position. solenoid. 2. The rotor is housed in a through hole provided in the center of the yoke, and has a structure such that it is not subjected to force in the direction of the rotation axis due to the magnetic flux generated by the magnetic flux generating means. An electromagnetic solenoid according to claim 1. 3. The support member includes a shaft and a member that fixes the shaft and yoke at a predetermined distance, and the rotor and the movable core are configured such that the shaft is inserted through a through hole provided in the center of each. 2. The electromagnetic solenoid according to claim 1, wherein the electromagnetic solenoid is supported by. 4. The rotor has a tapered recess in a portion facing the movable core, and the movable core has a tapered portion fitting into the recess in a portion facing the rotor. The electromagnetic solenoid described in item 1. 5
After the magnetic flux generating means operates and the movable iron core moves from the first position to the second position, when the magnetic flux generating means becomes inactive and the magnetic attraction between the movable iron core and the rotor disappears, 5. The electromagnetic solenoid according to claim 1, further comprising a spring for moving the movable iron core from the second position to the first position.