JPS609020Y2 - wire dot printer head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire dot printer head that forms characters, etc. using a dot matrix.

Among wire dot printers of this type, a system in which a moving coil is used to drive a printing wire is already known.

However, in the conventional type, the movable arm for transmitting the motion of the movable coil to the printing wire was separately provided, so there were many parts and assembly was very troublesome, and each movable coil and its corresponding There are many adjustment points such as relative positioning with each permanent magnet, and there are also disadvantages such as difficulty in downsizing and increasing the number of pins.

In addition, in such a moving coil type printer head,
Heat generation from the moving coil becomes a problem when the printing wire is driven continuously at high speed, but in conventional models, the fins for dissipating this heat were made of completely separate parts, which further increased the number of parts. , and also had the disadvantage that the expected radiation effect could not be obtained.

The present invention eliminates the drawbacks of the prior art, and
One embodiment will be described below with reference to the drawings.

In FIGS. 1 and 2, a guide holder 3 with a tip guide 2 mounted thereon is attached to the center of a support plate 1, and a support 4 is erected on the outer periphery of this support plate.

A plate spring 9.10 and a support plate 16 are connected to this support 4 via a ring-shaped spacer 5.6.7 and a mounting screw 8.
are fixed in parallel with a predetermined interval.

As shown in FIG. 3, the leaf spring 9 has a ring-shaped connecting portion 9.
A large number (one pot in this example) of movable arms 9 inward from a
b are formed radially and integrally.

A positioning hole 9c through which the support column 4 can be inserted is bored in the connecting portion 9a.

Further, each movable arm 9b is provided with a bobbin mounting hole 9d, and as shown in the second figure, a bobbin 12 having a movable coil 11 wound thereon is fixedly attached to each of the bobbin mounting holes 9d.

Although the leaf spring 10 is a part having exactly the same shape as the leaf spring 9,
The movable arm 10b is mounted so as to be shifted by half a pitch relative to the movable arm 9b, and the movable coil 13
(Bobbin 14) is fixed in the opposite direction to movable coil 11 (Bobbin 12).

A printing wire 15 is fixed to the tip of each of the movable arms 9b and 10b of the leaf springs 9 and 10, and the printing wires are closely aligned in a vertical line in this example by the tip guide 2 at the tip. Supported in a slidable manner.

Furthermore, permanent magnets 18 are arranged concentrically on the support plates 1 and 16 via a yoke 17.

The magnetic gap formed between the permanent magnet 18 and the yoke 17 is such that each movable coil 11, 13 can be displaceably fitted into this magnetic gap simply by supporting the leaf springs 9, 10 as described above. They are placed in a predetermined positional relationship.

Furthermore, the outer peripheries of the connecting parts 9a and 10a of the leaf springs 9.10 are provided with heat dissipation fins 9e. 10e is integrally formed so as to extend to the outside of the spacers 5, 6.7.

When a current is applied to the movable coil 11.13, the movable coil moves toward the support plate 1, and the corresponding printing wire 15 is advanced against the spring force of the movable arms 9b, 10b. The ink ribbon is a recording paper (both not shown).

) the desired dots are formed.

When the current to the movable coil 11.13 is cut off, the printing wire 15 returns to its original position due to the spring force of the movable arm 9bt10b.

Although not shown in the drawings, a damper member such as rubber is provided on each movable arm 9b to quickly attenuate and absorb the reaction force at this time.
, 10b are provided close to the back side.

Furthermore, the heat generated in the movable coil 11.13 by intermittent current application to the movable coil 11.13 is directly transmitted to the movable arms 9b, 10b and the connecting portion 9a.

The heat is transmitted to the fins 9e and 10e via the fins 10a, and is efficiently radiated to the outside from the fins 9e and 10e.

According to the wire dot printer head according to the present invention described in detail above, each movable arm for transmitting the motion of the movable coil to the printing wire is integrally connected to the ring-shaped connecting portion at its outer end. , the number of parts is significantly reduced, and the assembly can be performed without adjusting the relative positional relationship between the moving coil and the permanent magnet at all.

Therefore, the efficiency of assembly work and the associated significant reduction in manufacturing costs are distantly related.

Furthermore, since the heat dissipation fin is integrally formed from the connecting portion, the heat from the moving coil can be efficiently dissipated without increasing the number of parts, making it suitable for high-speed continuous driving of the printing wire.

[Brief explanation of the drawing]

The drawings show an embodiment of the wire dot printer head according to the present invention. Fig. 1 is a front view thereof, Fig. 2 is an enlarged sectional view taken along the line ■-■ in Fig. 1 with some internal mechanisms omitted, and Fig. 3 is a front view of the leaf spring. 1.16...Support plate, 4.5.6.7.8...
...Support member, 9, 10...Plate spring, 9a
, 10a...Connection part, 9b, 10b...
・Movable arm, 9e, 10e... Heat dissipation fin, 1
1, 13... Moving coil, 15... Printing wire, 17... Yoke, 18...
permanent magnet.

Claims (1)

[Scope of utility model registration request] A large number of magnetic gaps arranged circumferentially on a support plate, a movable coil displaceably fitted into each magnetic gap, movable arms to which each movable coil is fixed and arranged radially, and each movable coil. each of the movable arms has a printing wire fixed to the tip of the arm, and each of the movable arms is integrally connected to a ring-shaped connecting portion at the rear end thereof and supported by a support member at the connecting portion; A wire dot printer head, characterized in that a heat dissipation fin is integrally formed extending from the outer periphery of the wire dot printer head.