JPS6382753A - Printing head - Google Patents

Abstract

PURPOSE:To achieve a high speed of a title printing head by strengthening magnetic attractive operation, by a method wherein a plurality of plate springs are formed in one united body at the outer edge in a radial direction, contacted with both an armature and a core, and the armature is made a part of a magnetic path when the core is excited. CONSTITUTION:When current is applied to a coil 8, an inner core 6a is excited and the route of inner core 6a yoke 6c outer core 6b crank spring 14 armature 12 inner core 6a is formed. The armature 12 is attracted to the inner core 6a against the energized force of plate springs thereby. At the same time, a print wire is moved in the longitudinal direction and protruded from the top of a wire supporting part 1b. When the application of current to a coil 8 is stopped, the inner core 6a is demagnetized, and the armature 12 is separated from the inner core 6a by the energized force of a plate spring 14c. At the same time, the print wire 13 is buried into the top of the wire supporting part 1b. Thereby, the armature is intensively attracted and the action of a printing head is made speedy.

Description

[Detailed description of the invention] [Industrial application field] The present invention forms one character by a dot matrix,
The present invention relates to a clapper-type print head that performs printing.

[Conventional technology]

Conventionally, most print heads of this type have used one helical spring for each armature as a return means for the armature.

[Problems to be solved]

The above-mentioned conventional printing system uses L helical springs for each armature as a return means for the armature, which makes it difficult to downsize and takes time to assemble. It was necessary. Furthermore, since the conventional armature is magnetically separated from the core that attracts it, it has a weak magnetic attraction effect and is unsuitable for high-speed operation.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and includes: a printed wire retractably provided on a head frame; an armature to which the printed wire is fixed; and a core that attracts the armature by magnetic action. In the print head comprising a biasing means for biasing the armature in a direction opposite to a suction direction of the core, the biasing means has a plurality of leaf springs arranged radially, and The leaf spring is integrally molded at the outer end in the radial direction, and is in contact with both the armature and the core so that the armature becomes part of a magnetic path when the core is energized. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view of a print head according to an embodiment of the present invention. In this figure, reference numeral 1 denotes a head frame, and this head frame l consists of a disc-shaped end plate 1a, a wire support part 1b hanging vertically in the center of this end plate 1a, and a wire support part 1b provided at the periphery of the end plate 1a. An annular side plate 1c is integrally molded, and a wire support portion 1b is provided at the center of the end plate 1a.
A through hole 2 opening at the tip of the wire is formed, and wire guides 3.3.3 are arranged and fixed in this through hole 2 at equal intervals.

Further, a disc-shaped lid 4 having the same size as the end plate 1a is attached to the top of the side plate 1c, and a cylindrical chamber 5 is formed by this lid 4 and the head frame 1. It is formed. In this chamber 5, an annular core 6 is fixed concentrically to the end plate 1a. An annular groove 7 is formed in this core 6, so that the cross section of the core 6 includes an inner core 6a on the radially inner side, an outer core 6b on the radially outer side, and the inner core 6a and the outer core 6b. The yoke 6C is inserted between the yoke 6C and the yoke 6C. Further, a coil 8 is provided in the inner core 6a, and by energizing the coil 8, the core 6 is excited.

Further, a cylindrical armature guide 9 is fixed to the radially outer wall of the outer core 6b. The length of this armature guide 9 is longer than the height of the outer core 6b, and protrudes from the upper end of the outer core 6b. On the other hand, the lid body 4 has an annular stopper lO on the chamber 5 side and on the radially inner side at a position corresponding to the armature guide 9.
and 11 are fixed, and one end 1 of a long armature 12 is fixed between the stopper 10 and the armature guide 9.
2a is inserted. In this case, armature 12
is rotatable in the vertical direction in the figure centering between the stopper 10 and the armature guide 9. A plurality of such armatures 12 are arranged radially within the chamber 5.

Further, a printed wire 13 is fixed to the other end 12b of the armature 12, and this printed wire 13 is inserted into the through hole 12 described above and connected to the wire guides 3, 3.
．． 3, and its tip 13a faces the tip of the wire support portion 1b.

Further, a crank spring 14 is fitted and fixed to the radially inner wall portion of the outer core 6b. As shown in FIGS. 2 and 3, the crank spring 14 includes a cylindrical fitting part 14a and a fitting part 14a that is disposed in the radial direction at one end of the fitting part 14a and integrally formed with the fitting part 14a. A plate body 14b having a shape of
c, 14c..., and leaf springs 14c, 14c
... is bent at an acute angle at its base end, and further bent at an acute angle near the base end. As a result, the tips of the leaf springs 14c, 14c...
They are arranged approximately parallel to and radially. Each of the leaf springs 14c, 14c, . Note that the crank spring 14 and armature 12 are made of ferromagnetic material.

In the above configuration, when the coil 8 is energized, the inner core 6a is excited, and the inner core 6a→yoke 6C→
It is formed in the following order: outer core 6b -> crank spring 14 -> armature 12 -> inner core 6a. As a result, the armature 12 strongly acts on the inner core 6a.
, and is attracted to the inner core 6a against the biasing force of the leaf spring 14c. When the armature 12 is attracted to the inner core 6a, the print wire 13 moves in the length direction and protrudes from the tip of the wire support part ib.

On the other hand, when the coil 8 is de-energized, the inner core 6a
is demagnetized, and the armature 12 is separated from the inner core 6a by the biasing force of the leaf spring 14c. At the same time, the print wire 13 is sunk into the tip of the wire support portion 1b.

〔Effect of the invention〕

As explained above, according to the present invention, a printed wire that is removably provided in a head frame, an armature to which this printed wire is fixed, a core that magnetically attracts this armature, and the armature are In the print head comprising biasing means for biasing in a direction opposite to the suction direction of the core, the biasing means has a plurality of leaf springs arranged radially, and the plurality of leaf springs , the radially outer end is integrally molded, and is in contact with both the armature and the core, so that the armature becomes part of the magnetic path when the core is energized, so that the print head is miniaturized; Also, assembly becomes easier. In addition, the armature is strongly attracted and the operation becomes faster.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a print head according to an embodiment of the present invention, and FIGS. 2 and 3 are a plan view and a side view, respectively, of a crank spring used in the print head. 1...Head frame 1a...End plate lb...
Wire support part IC...Side plate 2...Through hole
3... Wire guide 4... Lid body
5... Chamber 6... Core 6a... Inner core 6b... Outer core 6C... Yoke 7... Concave groove 8... Coil 9...
Armature guide 10.11... Stopper 12... Armature 13... Printed wire 14... Crank spring 14a... Fitting part 14b... Plate body 14c...
・・Plate spring

Claims (1)

[Claims] A printed wire recessably provided in the head frame, an armature to which the printed wire is fixed,
A print head comprising a core that magnetically attracts the armature, and biasing means that biases the armature in a direction opposite to the direction of attraction of the core,
The biasing means includes a plurality of leaf springs arranged radially, and the plurality of leaf springs are integrally molded at their radially outer ends and are in contact with both the armature and the core. A print head characterized in that the armature is part of a magnetic path when the core is energized.