JPS59123675A - Electromagnet device for dot printer - Google Patents

Abstract

PURPOSE:The titled device having high sensitivity, consuming a small quantity of electric power and operated at high speed, wherein a yoke is substantially E-shaped, a permanent magnet is intermediately provided at a side piece on one side of the yoke, and an intermediate part of an armature is brought into contact with a central piece of the yoke to use the latter as a fulcrum. CONSTITUTION:An end part of the central piece 15a of the yoke 15 is made to be a supporting surface 15d for the armature 18, while end parts of the left and right side pieces 15b, 15c of the yoke 15 are made to be pole-contacting surfaces 15e, 15f for the armature. The permanent magnet 16 is intermediately provided in the magnetic circuit of the left side piece 15b of the yoke 15 to provide an electromagnet construction for both non-polar type and polar type so that a magnetic attracting force can be provided in a wide range at both ends of the stroke of the armature.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a print head of a dot printer used as an output device for computer equipment, and in particular, a plurality of dot printer print heads are arranged radially within the print head and correspond to printing by external voltage application. The present invention relates to an electromagnetic device that is driven by a wire and stamps predetermined characters, etc.

[Background technology]

Conventional electromagnetic devices for dot printers can be broadly classified into the following two types, as shown in FIGS. 1 to 4. One is non-polar and the other is polar. The former non-polar type has a U-shaped yoke 2 equipped with a coil 1, and an armature 6 is configured to straddle both liquid electrode surfaces of this U-shaped yoke 2. The base end is pressed against one of the contact surfaces of the U-shaped yoke 2 by a return spring 4 and serves as a fulcrum.The free end is always pushed up by the wire return spring 5 via the striking part of the printing wire 6. , a constant air gap of Q1 is secured between the other armature surface of the yoke 2 and the armature 6. When voltage is now applied to the coil 1, the armature 6 is attracted to the armature surface of the U-shaped yoke 2. .The relationship between the movement stroke X of the amateur A and the suction force width Y until it is sucked is as shown in Figure 2.In other words, when the movement stroke of the amateur A is 0 and the gap is the largest, the suction is achieved. The force width is the smallest, so the attraction force immediately after the excitation of coil 2 is started is small, resulting in slow acceleration of the armature.Therefore, in order to operate the armature 6 at high speed, it is necessary to increase the excitation of the coil, which is suitable for dot printers. However, there were problems in achieving higher sensitivity and lower power consumption of the magnet device.

In the latter polar type, as shown in FIG. 6, a permanent magnet 8 is interposed on one side of a U-shaped yoke 7, and a coil 9 is wound around the other side. An armature spring 11 is arranged at the base end of this armature 10 so as to straddle both liquid pole surfaces of this T-shaped yoke 7. The free end, which presses the armature surface of the electric power and serves as a fulcrum and also applies a release force from the other armature surface, is always in contact with the printing wire 16 by the wire return spring 12. Note that the armature spring 11 and The force relationship between the wire return springs 12 is set so that the former is sufficiently larger than the latter. Figure 3 shows the armature 10 being attracted to the yoke 7. The armature 10 is attracted by the intervening permanent magnet 8. Of course, in this case, the attraction force by the permanent magnet 8 is greater than the dissociation force from the yoke armature surface by the armature spring 11.

Next, to explain the operation of amateur 1b, is it a coil? When a heavy pressure is applied in a direction opposite to the magnetic flux direction of the permanent magnet 8, the attraction force of the armature 10 by the permanent magnet 8 is weakened, and a dissociation force is applied to the armature spring 11 installed at the base end of the armature 10. Therefore, the free end of the armature 10 pushes down the printing wire 16 against the wire return spring 12.

The relationship between the movement stroke X and the suction force width Y until the armature 10 is separated from the armature surface of the yoke 7 by a predetermined distance is as shown in FIG. That is, when the moving stroke of the armature 10 is maximum and the air cap is the largest, the suction force width is the smallest, and therefore the printing energy of the printing wire 16 is small. In order to increase this, the charging characteristics of the armature spring 11 can be compromised, but on the contrary, the permanent magnet must be made stronger and the coil capacity hj must also be increased. In this way, as a polarized type magnet device, it is possible to achieve high resistance and low consumption.
2 lij, there was a problem in advancing the power ratio.

〔the purpose〕

The present invention has been achieved in view of the above points, and the first object is to make the yoke approximately E-shaped, interpose a permanent magnet on one side, and abut the intermediate part of the armature on this central piece. The fulcrum was created by using an electromagnetic structure that combines both a fine pole type and a polar type, and the end is placed so as to straddle both liquid pole surfaces of the yoke. Large rli of suction force, simple structure, low consumption! The purpose of the present invention is to provide an electromagnetic device for a do-no-do printer with high power and high speed operation.

By adopting an i[Th stone structure that combines both the The purpose of the present invention is to provide an electric grinding stone device for do-7-top-1-nonta that can obtain high printing power with reduced consumption.

[Disclosure of the invention]

(Example) Based on FIG. 5 listed below as an example of the first invention, b, 15
The end of the center piece 15a is a support surface 15d for the armature, which will be described later, and the left and right support pieces 15b,
The ends of 15C are armature armature surfaces 15e and 15f. A permanent magnet 16 is interposed in the magnetic path of the left piece 151). Then, the armature surface j5e of the left piece 15b and the center piece 15. A step A with a constant width of 15dLIJr is provided on the support surface. Incidentally, there is nothing wrong with configuring this step on the right side piece 15C. 17 is the center piece 15a of the yoke 15
It is a coil equipped with. 18 is No. 61 York 15
The intermediate portion 18b is always in contact with the support surface 15d of the central piece 15a of the yoke 15 and serves as a fulcrum. ing. The armature surface 15f of the right side piece 15C of the yoke 15 is located between the intermediate portion 18b and the free end i3d and is opposed to the yoke 15 at a position substantially equal to the distance between the intermediate portion 18b and the base end 18a. The free end 18d of the armature is constantly in contact with the printing wire 20 by the wire return bar 19. Note that it is also possible to form a protrusion on the intermediate portion 18b of the armature and make it abut against the support surface 15d of the yoke 15 and use it as a fulcrum of the armature, and the invention is not limited to this configuration in any way. Reference numeral 21 denotes a presser spring for holding the armature 18 in a predetermined position.

Next, based on FIG. 6 listed as the first embodiment of the second invention, only the points different from the first invention will be explained.
is located at a predetermined distance from the intermediate portion 18b of the armature 18 on the left and right sides. The left and right compression springs have different load characteristics to ensure a predetermined relationship. That is, the relationship between the spring coefficient Q of the left and right compression springs is Q≦D. In this embodiment, a compression spring is used, but a tension spring may be used to tension the yoke 15 from the yoke 15 side. However, this is not limited to this embodiment.

Next, a description will be given based on FIG. 7 shown as a second embodiment of the second invention. Reference numeral 25 denotes a plate spring 1 whose intermediate portion is supported and whose left and right sides are integrated. Armatures 1 are attached to the left and right free ends of the plate spring 25.
It is integrally fixed with pressers 26 and 27 that press a predetermined position of 8. As a method of changing the first load at the left and right free ends of the plate spring, other than the above-mentioned method, there is also a method of varying the hold from the support part of the plate spring 25 to the presser on the left and right sides, or It is also possible to use a method of making the left and right dimensions different, and the present embodiment is not limited in any way. Although the method of supporting the intermediate portion of the leaf spring 25 is not shown in detail, it can be easily fixed to the main body by screwing or the like.

(Operation) Next, the operation of the embodiment of the first invention will be described. FIG. 8 shows the state before voltage is applied to the coil 17. The permanent magnet 16 generates a magnetic flux, and the closing force 2 acts, and at the same time, in combination with the pressing force from the armature holding spring 21 and the returning force from the wire return spring 19, the proximal end of the armature 18 is
a is attracted to and stored on the first contact surface 15e of the yoke 15. Sho yoke 15
In the second air gap B between the second armature surface 15f and the armature 18, an attractive force is generated due to the magnetic flux 2, or the magnetic flux density in the first air gap is high and the attractive force is strong. Next, the permanent magnet 1 is attached to the coil 17.
Magnetic flux due to 6. If a voltage is applied that generates magnetic flux in the opposite direction to the meat-fin, magnetic flux 8. @ is formed. Due to these magnetic fluxes, the magnetic flux caused by the permanent magnet 16 is canceled in the first air gap A, and the magnetic flux is multiplied by m in the second air gap B, so that the armature 18
Adsorb and store on 5f. The relationship between the movement stroke X of the armature 18 in the second air gear H and the suction force width Y is shown in FIG. In this case, the suction width is large at the position where the movement stroke of the amachia 18 is 0 or at the maximum suction position. This has the characteristics of a magnetic pole type and a non-polar type due to the permanent magnet 16 at the position where the Custrol is 0.

Next, the operation of the first embodiment of the second invention will be explained with respect to only the points that are different from the first embodiment.The 11 attractive force in the direction of the arrow P at the free end 18d of the tea armature 18 in the f4-J6 section 1 is , left and right compression splinters 2. This is influenced by the load characteristics of S, 24, the magnetic characteristics of the permanent magnet 16, and the direction of magnetization of the coil 17.

Now the free end of amateur 18 to represent the relationship 18
The first ot81 shows the relationship between the moving stroke X, suction force, and spring load characteristic Y at d! It is J. In this figure, a represents the attractive force characteristics of the coil 1'7 and the permanent magnet 16 when the left and right compression springs 26 and 24 are not considered. The output energy in this case is the area r surrounding the curve and 0. b represents the spring characteristics of the left compression spring 26. This is the arrow direction P of amateur 18
(On the other hand, this is a load in a negative direction and acts negatively as output energy. C represents the spring characteristics of the right compression spring 24. The load is in a positive direction, and the output energy is positive.The cart at the movement stroke D of the right side compression spring is sufficiently thick compared to the left side compression spring 26, as explained in the previous embodiment. The spring coefficient of this compression spring is also increased in the S-cTχ history. (Q≦R). d represents the combined spring load characteristic of the left and right compression springs 23 and 24 described above. In this case, the movement stroke is 0. The suction force in the case is compared to that without the spring ('r-s
). Therefore, the water crab contradiction is the area Q surrounded by this composite spring load straight line d and the curve a in the case of rated excitation that does not include the spring, and by making Q larger than the above-mentioned P, more output energy can be obtained. can be taken out. When the coil 17 is not energized, the attraction force in the negative direction is increased at the free end 18d of the armature 18. This is because the point of intersection between the composite spring load straight line d and the straight line of attraction force 0 when rated excitation≠ is weaker than the center point force of the entire stroke.Also, the composite spring load straight line d must be between the rated excitation curve a, which does not include a spring, and the attraction force curve e, which is applied when excitation is applied.

Next, the operation of the second embodiment of the second invention is completely the same as that of the first embodiment. That is, the load characteristic of the presser 26 is the first
This corresponds to the left compression spring 26 of the embodiment, and the presser 27 similarly corresponds to the right compression spring 24.

(Effect) The effect based on the scope of the claims in the first invention is that a permanent magnet is interposed on one side piece of the approximately E-shaped yoke as described above,
The middle part of the armature is brought into contact with the end of this central piece to form a fulcrum, and its free end is placed so as to straddle both liquid pole surfaces of the yoke, making it both a non-polar type and a polar type. Because it has a frosted magnet structure, the magnetic attraction width is larger at both ends of the armature's movement stroke compared to conventional dot printer electric grout devices with polarized or dedicated polarized types. This increases the printing speed of the dot printer and provides stable printing power. Furthermore, if high speed is not required, the power consumption of the coil can be reduced by interposing a permanent magnet in the yoke. Furthermore, since the fulcrum of the armature is located approximately in the center, the rolling moment is smaller than in the conventional one-sided fulcrum, and therefore malfunctions due to external shocks are less likely to occur.

Next, the effect based on the scope of the claims in the second invention is, as described above, in addition to the requirements of the first invention, the left and right spouts that press the amateur? ! By configuring the armature and setting the loads between them in a predetermined relationship, a uniform suction method can be obtained over the entire stroke of the armature, creating a sword that extracts output energy into load motion. Furthermore, if an increase in output energy is not required, the coil 7 consumption box and force can be reduced. Historically, from the coil side, the load at the start of armature operation is reduced by the left and right compression springs, which shortens the time from when the coil is energized to its rated value until the start of operation, resulting in improved responsiveness as an electromagnetic device. It is good.

In the case where the left and right springs in the second invention are formed by leaf springs whose intermediate portions are supported, and the armature is pressed by the free ends, the number of parts is reduced compared to the first embodiment. This has the effect of making assembly easier.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram showing a conventional non-polar electromagnet device for a dot printer. FIG. 2 is a characteristic diagram showing the relationship between the attractive force width and the stroke of a non-polar electromagnet device. FIG. 6 is a schematic explanatory diagram showing a conventional polarized electromagnet device for a dot printer. FIG. 4 is a characteristic diagram showing the relationship between the attractive force width and stroke of the polarized type magnet device. FIG. 5 is a schematic explanatory diagram of the dot printer moon phase 5' and stone device of the first invention. Figure 1 is a characteristic diagram showing the relationship between the suction force width and the stroke of the electromagnetic device for a dot printer according to the first invention. Figure ≠ is a schematic explanatory diagram of an electromagnetic device for a dot printer according to the first embodiment of the second invention. FIG. 2 is a schematic explanatory diagram of a second embodiment of the second invention. No.? The figure is an explanatory diagram of the operation of the first invention. FIG. 10 is an explanatory diagram of the operation of the second invention. 15 - Yoke 15a = Central piece 15b of yoke - Left piece 15c of tt = Right piece 15d of u = // End of central piece 15e - End of left piece 15f of yoke - End 16 of right side of yoke - Permanent magnet 17 = Coil 18 - Amateurs 18a, 18C = Free end of armature 18b - Intermediate part of armature 26 - Left side compression spring 24 - Right side compression splinter 25 - Leaf spring Patent applicant Matsushita Electric Works Co., Ltd. Agent Patent attorney Take Mitsutoshi Maru (2 idiots) 419 Figure 1 Figure 2 Figure 9 Flash

Claims (3)

[Claims] (1) A yoke that is approximately E-shaped, with the end of the central piece being a support surface and the ends of the left and right side pieces being polarized surfaces, with a permanent magnet interposed in one of the side pieces; A coil installed in the center piece of the yoke is arranged so as to straddle the support surface and both pole surfaces of the yoke, and this intermediate part contacts the support surface of the yoke and serves as a fulcrum, and both free ends are arranged in the cutting direction. An electromagnetic device for a dot printer, characterized by comprising an armature and an armature that is attracted to either the left or right armature surface by excitation and demagnetization of a counter-rotating coil. (2) A yoke that is shaped like an IIB, with the end of the central piece being a support surface and the ends of the left and right side pieces being polarized surfaces, with a permanent magnet interposed in one of the side pieces, and the yoke. A coil installed in the central piece of the yoke is arranged so as to straddle the supporting surface of the yoke and the supporting surface of the yoke, and this intermediate portion contacts the supporting surface of the yoke and serves as a fulcrum, and both free ends are connected to the supporting surface of the yoke. There are armatures that are placed on either side of the armature and are alternately attracted to either the left or right armature by excitation and demagnetization of the coil. An electromagnetic device for dot printers, characterized by having left and right springs that press the dot printer. (3) The electromagnetic device for a dot printer according to claim 2, wherein the left and right springs are connected by a plate spring supported at an intermediate portion, and the armatures are pressed at both ends of the left and right springs.