JPS606475A - Dot printer head - Google Patents

Abstract

PURPOSE:To make it possible to easily perform the assembling of a dot printer head by making the projection amount of a needle constant, by constituting a needle guide for guiding the needle in a two-body structure in order to hold needle with a return spring. CONSTITUTION:After a needle 7 is preliminarily passed through a needle guide A10a through a return spring 8 from a 10a4 side to be assembled to said guide A10a, it is inserted into the interior 10b3 of a needle guide B10b along with a wire chip 7b which is, in turn, inserted into a needle guide hole of 10b1. In the next step, the guide projection 10b5 of the needle guide B10b is forcibly introduced into the guide hole 10a6 of the guide A10a to connect both divided needle guides 10a, 10b which are, in turn, fixed to a first yoke 1 by a screw 14 so as to hold a heat dissipating plate 11 therebetween. By this mechanism, the needle is made constant in the projection amount thereof to an outward direction even if receives the force of the return spring. Therefore, assembling becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to the structure of a dot printer head that uses a 4J8 stone.

<Prior Art> The needle guide that guides the entire needle in the two-dot printer head of a conventional machine has an integral groove structure. Therefore, when attaching the needle to the needle guide, when the dot printer head is raised up, the needle receives the action of a return spring to return the needle. The ML of the ++m protrusion varies. In this state, the ijJ moving piece that acts on the needle between the platens is attached to the electromagnetic yoke or needle guide with the needle fully valved.
It was necessary to adjust the protrusion of the needle, making the assembly extremely troublesome. O with the needle guide consisting of these two bodies.
By holding the needle with a return spring, the protrusion of the needle attached to the needle guide can be kept constant, and the dot printer head can be easily and easily mounted.

<Embodiments of the Invention> The structure and features of a dot printer head according to the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a structure G of an embodiment of a dot printer head according to the present invention, and FIG. 2 is a perspective view of the structure.

Reference numeral 1 denotes a first yoke, which is cup-shaped and has seven fixed iron cores 2 standing at its bottom. 3 is a coil frame that is fitted into the fixed core 2; Surface 6a is locked. Reference numeral 4 denotes a second yoke, which has a disk shape and whose outer peripheral part is fitted into the inner surface of the first yoke 1, and then the second yoke 4 is locked by the locking part 50 of the coil frame 3. McCoil frame 3
is held between the fixed iron core 2 and the second yoke 4.

On the other hand, the coil frame 6 and the second yoke 4 serve as means for positioning each other relative to each other, and the coil frame 3 has positioning protrusions 3c, !, as shown in FIG. The yoke 4 of t4s2 has guides 4c, 4d, cypress and 4θ sets, and 7 sets of coil frames 7, respectively.
1i! 11 in the shape of a notch, and these positioning protrusions are fitted into the guides to determine 4ti xt (i 1e) of the coil frame 5 and the second yoke 4. Also, the positioning protrusions 6c of the coil frame 6 and 5dK has a longitudinal direction K "U" shaped groove 5cm 1.5d-1 formed on its outer peripheral surface, and the end of the coil 3f wound around the coil frame 6 has a UJ-shaped groove 3cm 1.3d-1 formed therein. 1 in 4D, the first position is connected to each coil lead terminal 12 press-fitted into the determining projections 3c and 6a.

On the surface of the second yoke 4 opposite to the coil frame 3, there is a thickness of 0.
The fulcrum of the town/qb piece 6 rests on the spacer 5 of about 1 order. Movable piece 61'JrUJ-shaped iron piece 6a
and a movable core 6 that is directly attracted to the end surface 2a of the fixed core 2.
The movable iron core 6b is fixed to an iron piece 611. The fulcrum position of the movable piece 6 is determined by fitting a hole 6a-1 made in one end of the iron piece 6a to a fulcrum projection (positioning projection) 3ei of the coil 6. Also hole 6a
The iron piece 6a [is bent at the fulcrum position near -1 to achieve smooth movement during the reciprocating movement of the movable piece 6, which will be described later, and to improve the durability of the spacer 5 at the fulcrum position jffK. The other end 6 a 72 of the iron piece 6 a engages with the needle 7 , which is guided by the needle guide 10 . Needle 7 U f, 7'C Needle guide 1
It is biased in the direction of arrow B by a spring 8 whose one end is locked by a spring jaw 10a-5 provided on a part of the spring 8. In order to reduce the position of the OT moving piece 6 when the coil 6f is not energized (standby), the fulcrum of the I-IT moving piece 6 is connected to the 4-way yoke of 18 pJ2 by the fulcrum pressing part 9a of the fulcrum engineering member 9. The movable piece 6 is held in the vicinity of 4 6 a -2, which engages with the needle 7, and is locked by 19b. The OT duty center 6b of the movable piece 6 is connected to the second yoke 4.
The coil frame 5 is inserted into the opening 4a of the coil frame 5 and the opening t'A5g of the coil frame 5, and is in the state of N=I.

When the coil 5flC is turned on, the generated 110 east is energized to the fixed iron core 2, the yoke 4 of the first yoke 1, 712, and the Or movable piece 6, and the movable piece 6 is attracted to the fixed iron core 2vζ, so that the needle 7 is attracted to the return spring 8. It is pushed out in the direction of arrow A against the force of 7, and the tip of the needle 7 hits the printing medium to print 7. After printing, the power to the coil 6f is cut off, so it's time! tlJIiii disheartening 6b, same) The suction force between 〆 and lu2 disappears, and the needle 7 is pulled back in the direction of arrow B, and the needle 7 is pulled back in the direction of arrow B, and the needle 7 is pulled back in the direction of arrow B. It is pulled back until it is locked at the locking point (m91).

The fulcrum engineering member 9 has a variety of functions in one piece. To explain with Figure 4, the fulcrum press fits 9 a
The surface that presses the ra vi piece 6a has an arc shape and is supported by an integrally made plate spring 9C, and the above-mentioned iron piece 6b near the fulcrum of the movable piece 6 is bent 1tls.
Press down elastically. This is determined by the height of the locking portion 9b from the spacer 5 and the projection 9d provided on the fulcrum pressing member 9 coming into contact with all the spacers 5.

Furthermore, it is decided to fit the fulcrum protrusion 6θ of the coil frame 3 into the guide groove 9θ formed in the fulcrum press part 9a when the fulcrum press member 9 is at an angle [-]. Also coil lead Dja
12 ri, pass through hole 9f. Coil lead terminal 12
is connected to the circuit board 15.

The fulcrum pressing member 9 is fixed by connecting it to the needle guide 10 with a screw 16. At this time, in order to prevent the fulcrum pressing member 9 from misaligning, the guide hole ``g'' of the fulcrum pressing member 9 and the columnar capital 1ub-2 of the needle guide 1U are fitted δ.

Thicken the needle guide 10 < Honey needle guide A10
It is divided into a and needle guide B 10'b,
10aVc is the tip guide 10a-1, the intermediate guide 10
a-2, IU a-3 is attached or provided, and g-7) a needle guide hole of 6 K rl 7 nM is provided. ' Also, seven needle guide holes are similarly bored in the needle guide capital 10b-1 of the needle guide B10b, and these needle guide holes are arranged so that the needle 7 can be guided easily. .

The needle 7 is made up of a wire 7a and a wire tip 7b, and is connected to the wire 7a and the wire tip 7bi by means such as welding or caulking. The wire tip 7b is provided with a collar 7C in order to be hung on the return spring 8.

10h -41fCf4 spring 1% 10a-5 is provided.

Place the mouth on the needle guide A10a (:'+1
＞ ' ``Thread A・8 (coil spring)/ζ needle 7
f 10 a From the -4 side to the needle guide hole, ++
After attaching nLli1, needle guide AI Da's wire tip 7 u 111i? Along with L' wire tip 7b, a cup-shaped needle guide B I L
l 1) (ill) Mu 10 b -s Hei:I
T person L/, 1 Tsuya tip 7b 10 b 1 i+1
rii2 kerare1hi: A guide wall 1 is placed in the internal IDb-3 of Vc i o b so that the wire tip 7b is naturally guided to the needle guide hole.
0b to 4 (shown in Figure 5) are provided, and a needle guide Δ11JaK is provided in the t guide hole 10a-6 =-
Guide protrusion 10b provided on dollar guide B101)
5 was press-fitted and the needle guide AI was divided into two parts.
Da and needle guide BI Ob are combined.

In the solid line 1'J of the tree brother 1, the needle guide B10b has a rough 1'' protrusion IUb-6 of 211d, and when making the above connection 8, these /I inner protrusions 10b-6
The two parts 10a-7 press against each other, making the joint 94'' real.The needle guide 'tC is bisected like this.
By making it an inno-four structure that can be delivered by the simple delivery method described above after passing the needle through the needle, the needle and needle guide can be assembled into one block by sterilizing the R and TFL heads. Since the hole 11 can be kept upright to prevent it from falling out, there is a great advantage in terms of ease of assembling the entire head.

In this way, it is made into one block: ') Needle guide 10 (・released to the yoke of gofuku 1 7: name plate 11 (1) 4. 11
angular positioning (+--to make the valley easier and improve the sharpness and uprightness R--eye position 1::t, needle guide B10 as a determining means)
b has a protrusion 10b inside which has a hole for the above-mentioned I and J 14 to pass through.
-7 is provided and this is fitted with the QJ receiving hole 11a provided in the heat dissipation plate 11'(/C; at the bottom of the 5° cup-shaped needle guide B10b, as described above, the guide portion IUb is fitted. -1 and the guide holes 9gV and Hf of the 7-point support member 9 are aligned, and the inner part (I) of the pillar 4 with the Mei-Ji (S 10 b-2 and L- I
1 part 6a-2 that holds the needle 7 of the J country piece 6, the means (arrowhead) 10b-8 in the throat 6 for preventing the horizontal press, and the needle guide 10 and +';! , 2 Yoke 4 and It'
To determine the relative angular position, ζ, 52 tr:) Yoke 4
1) -9 is provided as a means for determining position t1:
lJretebe).

Needle guide A 10 a (Jul >lii
ttm (rζ) of the entire dot printer head (111 to 16th by screw 17 =, t/pH to 'J to be f!1: i 4'?
:13 I [1a -8. 10+9-8e This has an oval j in the longitudinal direction of the needle guide 10, and has a hole 10a-9 in which the screw 17 fits. (not shown) It has a structure that allows you to freely set the !7ti separation at ¥ to -11.

The shape of the heat dissipation section 11 is such that KfI curved portions 11b are provided along the outer periphery of the first yoke 1 in order to increase the heat dissipation surface area t, as shown by 21J. In addition, in the embodiment C, the heat sink 11 is separated by a 1. 11 Heat dissipation surface 1
It is effective from the point of increasing λ.

The first yoke 1 has a completely circular shape, so
＋llI Department Upper Precepts Vζ〈By providing the fin 1a, it is possible to make the parts as small as possible. Design - Very good.

The spacer 5 is a fulcrum point d1 between the yoke 4 and the movable piece 6 of 1 and 1t2. If it is possible to make the entire area near the fulcrum of the 1-IT Sir piece 6 plastic, it is possible to use a glass coating, or the material τ can be selected. If possible, the spacer 5 is difficult to provide.Especially when a plastic coating is adopted, the coating layer can be regarded as the spacer 5.

<Effects of the Invention> According to the present invention, the needle guide included in the needle system has a two-piece structure, and this needle guide holds the needle with a return spring. Regardless of the spring force, the amount of acid that flies out of the needle guide is all constant.

Therefore, in this state, even if you assemble the 1-length movable piece of the needle metal making section and the fulcrum of the movable piece 1μ and 1o in sequence, the protrusion 11< of the needle remains constant throughout. It has the advantage of being incredibly easy to assemble, and without the trouble of assembling with conventional structures.

[Brief explanation of the drawing]

Figure g1 is a sectional view of a T-dot glitter head showing an embodiment of the present invention, and Figure 2 is a perspective view of the same. , n3 is a plan view of the coil frame 1. Figure n4 shows details of the fulcrum pressing member 1111
11t- is a plan view showing the knee and the dollar guide B. 1...First yoke 2... Fixed iron core 6
......Coil frame 4...Second yoke 6
...Movable piece 7...Needle 8...
... Return spring 9 ... Fulcrum pressing member 10 ...
...Needle guide and above 428

Claims (1)

[Claims] A dot printer head that attracts the movable piece with a magnetic magnet and moves the needle engaged with one end of the movable piece in its axial direction to perform printing, has a needle guide that guides the Ail marking needle. The needle guide A and iiJ are divided into two parts, guide A and needle guide B.
The needle guide B clamps the collar of the wire cap of the needle and a return spring for returning the needle, ii) He needle guide is fastened to the electromagnet iii, and the fulcrum of the oJ moving piece is A dot printer head characterized in that a fulcrum pressing member for pressing the dot is fastened to the needle guide.