JPH0411794Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field The present invention relates to a drive unit for driving a printing head of a printer, a so-called printing magnet, and particularly to an armature support structure.

(b) Prior Art The conventional printing magnet of such a printing head converts electromagnetic energy into mechanical kinetic energy by using a rotatably supported armature as a movable part. The drive unit has a structure called a release type, in which the armature is attracted against the pivot spring force (moment) and when necessary, it is energized to weaken the retaining magnetic flux of the loop magnetic path. The armature is set in a neutral position at a position and angle a predetermined amount different from the position where it is attracted to the core, and is attracted while storing energy by deflecting the spring by the difference in attitude from when it is attracted, and is released by excitation.

FIG. 1 is an explanatory diagram of a conventional drive section.

In the figure, 1 is the core, 2 is the permanent magnet, 3 is the attachment part, 4
is a space block, 5 is a structure, 6 is a support spring, 7 is an armature, 8 is an arm, 9 is a printing wire, 10 is an excitation coil, 11 is a mounting member for the support spring 6, 11a is an auxiliary magnetic path member, and 11a The part is shaped like an armature. Further, the arrow indicates the direction in which the suction force is applied, and the x mark indicates the center of rotation of the armature.

In such a configuration, when a cantilever dyeing such as the support spring 6 is perpendicular to the direction of the suction force on the armature, the support length portion of the cantilever deforms into an S-shape, so it is not well defined as a shaft fulcrum. In other words, since it lacks rigidity as a fulcrum against external forces, the stored strain energy changes depending on the posture during suction, the energy distributed to the printing wire, arm, and armature changes when released, and when the printing wire makes an impact. The power that can be used as striking force changes. In this sense, the fulcrum of the armature has rigidity in the direction in which the suction force of the armature acts and the direction in which the impact force during printing acts, and the moment support force generated at the fulcrum due to the action of these forces moves the center of rotation. It is necessary to support the structure without causing any damage, but the above configuration was insufficient.

(C) Purpose The present invention was made in view of the above, and as a support structure for the armature, the structure of the leaf spring is attached to a pair of support parts in the same direction as the direction of action of the printing pin provided on the armature. The armature is configured to be a plate spring supported at both upper and lower ends, and the armature is fixed between the support portions of such a plate spring.

In this way, since it is a leaf spring supported at both ends,
Assuming a leaf spring of the same length that provides the same restoring force against the rotational movement of the armature, compared to a cantilevered leaf spring, the stiffness is higher, the armature has less lateral wobbling, and its operation is stable.

(d) Embodiment FIG. 3 is an explanatory diagram of a driving section according to an embodiment of the present invention.

The difference from FIG. 1 is that the member 11, the spring 6,
The only difference is the support structure for the auxiliary magnetic path 11a and the armature 7, and the rest is the same as in FIG. In addition, corresponding to these, 21 is a member that supports the spring on both sides,
22 is the spring of the configuration of the present invention, 23 is the armature of the invention, and 21a is the auxiliary magnetic path of the configuration of the present invention.
The member 21 is attached to the structure 5 by screws or the like in an assembly unit up to the wire, but the member 21 has an overhang at both the upper and lower ends, and the leaf spring 23 is tensioned and fixed in the vertical direction using the overhang as both supporting parts. An end portion of the armature 23 (an end surface parallel to the suction force direction and the impact reaction force acting direction) is fixedly supported at the center of the span. By adopting this configuration, the assembly of the armature, arm, wire, and spring member can be attached to and detached from the structure 5 as a unit (by screws, etc.) as in the past, and the direction of action of suction force or printing force can be controlled. y, and its orthogonal direction is defined as x,
A spring fulcrum with extremely high rigidity and moment restoring force in the y-direction can be obtained, and a fulcrum whose rotation center hardly moves in the y-direction when the armature is operated or the wire is impacted can be realized.

(E) Effect In this way, the leaf spring that fixes the armature is supported at both ends, so compared to the conventional cantilever-supported leaf spring, it has a high degree of stability at the time of impact or recovery due to the reaction force. vibration is reduced, and printing speed can be increased and stabilized.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional drive unit, and FIG. 2 is an explanatory diagram of a drive unit according to an embodiment of the present invention. In the figure, 1 is a core, 2 is a permanent magnet, and 5 is a structure 6
and 22 are springs, 11 and 21 are mounting members,
7 and 23 are armatures, 8 is an arm, 9 is a printing wire, and 10 is a coil.

Claims (1)

[Claims for Utility Model Registration] In a printing head drive unit that has a coil and a loop magnetic path, and a part of the loop magnetic path is a movable armature, as a structure of a fulcrum spring that pivotally supports the armature, An armature comprising: a plate spring supported at both upper and lower ends supported by a pair of support parts in the same direction as the acting direction of the provided printing pin; and the armature is fixed between the support parts of the leaf spring. Support mechanism.