JPS6052360A - Dot impact printing head - Google Patents

Abstract

PURPOSE:To prevent the high-order vibration of plate spring as well as stabilize the characteristics of printing by a method in which a couple composed of the product of the attraction force of an armature at the core attraction point from the core attraction point to the fixing point between the armature and the plate spring is acted on the plate spring and strain energy is stored. CONSTITUTION:Under the condition that an electromagnetic coil 3 is not energized electrically, an armature 9 attached with dot wires 15 is attracted to the tip of the core 2 by the magnetic flux phiM of a permanent magnet 6. A tongue piece 13 is uniformly curved between the fixed point of the armature 9 and the attraction point of the core 2 by a couple pr, where (r) is the length from the fixed point between the tongue piece 13 of the plate spring 12 and the armature 9 to the attraction point between the core 2 and the armature 9 and (p) is the attraction force of the armature 9 at the attraction point of the core 2, and strain energy is held in the stored condition. When the coil 3 is electrically energized, the magnetic flux phiM is negated, and the armature 9 is turned by the strain energy of the tongue piece 13. In this case, since the piece 13 is moved while orderly contacting with the face of disc yoke 8, the high-order vibration of the plate spring 12 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a dot impact print head of a spring-charged type, in which high-order vibration of a spring and wear of a spring fulcrum are reduced.

[Prior art]

In the conventional spring-charged dot impact print head, for example, as shown in Japanese Patent Application No. 56-125160, the armature and yoke are arranged on the core side with a leaf spring guard, and the yoke shape is changed to the core without the yoke. The shape is approximately the same as the deflection curve of the leaf spring when the leaf spring is attracted, thereby reducing high-order vibrations of the leaf spring.

However, making the shape of the yoke substantially in the shape of a deflection curve of a leaf spring has the drawback of increasing variations in structural characteristics. In addition, in order to suppress higher-order vibrations, some structures have a structure in which a rigid body such as a core receives the reaction force applied to the armature at the time of impact. This has the disadvantage that one point of the leaf spring tends to wear out and the printing characteristics change.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to prevent high-order vibrations of the leaf spring and to stabilize printing characteristics.

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention forms a slit in a tongue portion above the groove of a leaf spring supported by a flat plate-like yoke in which a groove is formed, and a rear end portion of an armature that drives within the groove. When the cores are arranged opposite to each other and the area armature is attracted to the core, a force couple consisting of the product of the length from the core suction point to the point where the armature and plate are fixed and the armature suction force at the core suction point is generated. acts on the leaf spring, and the leaf spring is deformed in a direction away from the flat yoke, thereby storing strain energy in the leaf spring.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 6.

In the figure, reference numeral 1 denotes a large 118 annular base yoke, and a plurality of cores 2 are integrally formed on the outer periphery of the base yoke in a right angle direction. 3 is an electromagnetic coil wound around the core 2; 4 is a substantially annular substrate connected to a lead wire of the electromagnetic coil 3; a hole 5 into which the core 2 is inserted is formed;

6 is an annular permanent magnet; 7 is a ring yoke laminated on the permanent magnet 6; 8 is a flat plate-like yoke having a circular shape and a constant thickness; A groove 10 serving as a side magnetic path is provided, and the armature 9 is arranged so as to be movable within the groove 10.

Reference numeral 11 denotes a regular polygonal annular spacer having the same number of sides as the armatures 9, and is arranged between the ring yoke 7 and the flat yoke 8 in order to provide a gap between the armature 9 and the core 2.

Reference numeral 12 denotes an annular leaf spring having a tongue piece 13 extending in a core shape, and the tongue piece 13 is provided with a substantially H-shaped slit 14, and an armature 9 is fixed to the tip side in the middle thereof. .

The rear end of the armature 9 is arranged to face the end of the slit 14 of the leaf spring 12 and also to face the core 2.

15 is a dot wire attached to the tip of the armature 9, and the dot printed end of the tip is the guide part 1 of the crank 16.
You will be guided to 7. 18 is a cover, and 19 is a crank spring that fixes each part of the dot impact print head together.

Next, to explain the operation of the above structure, first, when the electromagnetic coil 3 is not energized, the armature 9 is attracted to the tip of the core 2 by the magnetic flux ΦM of the permanent magnet 6, as shown in FIG. . That is, as shown in FIG. 5, the length from the point where the tongue piece 13 of the leaf spring 12 and the armature 9 are fixed to the point where the core 2 and the armature 9 are attracted is r, and the length of the core 2 is
If the suction force of the armature 9 at the suction point is fp, a force couple pr acts on the tongue piece 13 of the leaf spring 12, bending the armature 9 in the opposite direction to the direction in which it is suctioned to the core 2, and releasing strain energy. It is kept in a stored state.

At this time, the tongue piece 13 of the leaf spring 12 is in a state of being evenly curved between the fixed point of the armature 9 and the suction point of the core 2.

Furthermore, when the electromagnetic coil 3 is energized, the magnetic flux φ of the permanent magnet 6
A magnetic flux ΦC is generated that cancels Mk, and the armature 9 becomes the tongue piece 1.
It rotates due to the strain energy of 3.

At this time, the tongue piece 13 of the leaf spring 12 is always attached to the disc-shaped yoke 8.
Since the dots move while sequentially contacting the surface, the high-order vibration of the leaf spring 12 is suppressed, and the strain energy of the leaf spring 12 is efficiently applied to the rotation of the armature 9, and the dots are transferred to the printing medium (not shown) by the dot wire 15. It will be printed.

In the above embodiment, a serial dot print head has been described, but it is also possible to arrange a plurality of electromagnetic mechanisms linearly in a line or in a plurality of rows and apply it to a line printer system.

〔Effect of the invention〕

As described above, according to the dot impact print head according to the present invention, a slit is formed in the tongue portion above the groove of the leaf spring supported by the flat plate-like yoke in which the groove is formed, and
Inside the groove 'f: When a core is disposed facing the rear end of the driving armature and the area armature is attracted to this core, the length from the core suction point to the fixation point of the armature and the leaf spring and the core suction point A force couple consisting of the product of the armature suction force at There is an effect that force is not applied to one part of the spring, and there is no change in printing characteristics due to wear of the fulcrum, and the flat plate-like yoke, which is easy to manufacture, also has the effect of suppressing higher-order vibrations.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is an exploded perspective view, Fig. 4 is a plan view of a leaf spring used in the present invention, and Fig. 5 is a plan view of the leaf spring used in the present invention. FIG. 6 is a partial plan view of an armature portion showing one embodiment of the present invention, and a side sectional view illustrating the present invention in detail. 2... Core 3... Electromagnetic coil 6... Permanent magnet 8... Flat yoke 9... Armature 10
... Groove 12 ... Leaf spring 13 ... Tongue piece 14 ...
・Thrift 15... Dot Wire patent applicant Oki Electric Industry Co., Ltd. agent Patent attorney Takashi Kanakura Niba 5-

Claims (1)

[Scope of Claims] 1. An armature having a dot wire at its tip is fixed to each of the tips of a plurality of tongues of a leaf spring, and with the tongues biased by the magnetic force of a permanent magnet, the armature is attached to the dot wire. By selectively energizing a plurality of correspondingly provided electromagnetic mechanisms, the magnetic flux of the permanent magnet is canceled and the strain energy accumulated in the leaf spring is converted into printing energy to perform printing. In a charge-type dot impact print head, a slit is formed in a tongue portion above the groove of a leaf spring supported by a flat plate-shaped yoke in which a groove is formed, and a core is formed in the rear end of an armature that drives within the groove. When a shear armature is placed facing each other and is attracted to this core, the leaf spring is The dot impact print head is characterized in that the leaf spring deforms in a direction away from the flat yoke to store strain energy in the leaf spring. 2. A dot impact print head characterized in that a permanent magnet is arranged in the center and a core around which an electromagnetic coil of an electromagnetic mechanism is wound is arranged around the outer circumference of the permanent magnet.