JPS62279960A - Printing head for dot printer - Google Patents

Abstract

PURPOSE:To enhance accuracy in positioning a nose and a solenoid base, by inserting a nose-positioning projection of the nose into a nose-positioning hole provided in the solenoid base. CONSTITUTION:A nose-positioning projection 1a of a nose 1 is passed through nose-positioning holes 9a, 8a provided respectively in a flexible printed circuit board 9 and an insulator 8, and is inserted into a nose-positioning hole 4b provided in a solenoid base 4. Thus, the nose 1 and the solenoid base 4 are positioned by the projection 1a and the hole 4b which are provided on the outer periphery side, so that the nose 1 and the solenoid base 4 are accurately positioned.

Description

3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a print head for a dot printer, and particularly to a positioning structure between a nose and a solenoid base, and a positioning structure between a solenoid base and an armature base.

[Prior Art] A print head for a dot printer includes a nose on which a plurality of wires are arranged, a solenoid base in which a plurality of cores are fixed in a circumferential manner, a solenoid bobbin is attached to these cores, and a plurality of armatures. The armature base is rotatably arranged.

Conventionally, the positioning of the nose and the solenoid base has been achieved by providing a central hole and a notch in the center of the solenoid base, a cylindrical part fitted into the central hole in the nose, and a cylindrical part fitted into the notch on the outer periphery of this cylindrical part. This was done by providing a protrusion that could be exposed. Further, the solenoid base and the armature base are positioned by providing a mounting hole such as a circular hole or a groove in the side wall of the outer periphery of the solenoid base, and by providing a projection on the armature base that is inserted into the positioning hole.

[Problem to be Solved by the Invention] As mentioned above, the positioning of the conose and the solenoid base is performed at the center, so when viewed in the direction of one rotation, the accuracy error increases in the peripheral parts, and the positioning accuracy in the rotational direction is If there is a misalignment between the nose and the solenoid base in the rotational direction, the contact position between the wire and the armature will deteriorate, and the wire and armature will not be fixed to each other. The wire pin and the armature may come into contact with each other unevenly, making them more likely to wear out.

The positioning of the solenoid base and armature base is performed by the solenoid base and armature base as described above, so the core and armature are positioned indirectly, resulting in poor positioning accuracy and poor positioning. If not, interference will occur between the plunger protruding from the armature and the solenoid pobbin, and - the operation of the armature will become unstable. Furthermore, the positioning notch formed in the side wall of the solenoid base must be punched out in a separate process after the solenoid base is drawn, which increases costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dot print head that can improve the positioning accuracy of the nose and solenoid base.

[Means for solving the problem] The above problem is caused by the fact that the nose has a plurality of wires slidably disposed thereon, a plurality of cores are fixed in a circumferential manner, and a solenoid pobbin is attached to these cores. Solenoid base and
In a dot printer print head comprising an armature base in which a plurality of armatures are rotatably arranged, the nose is provided with a nose positioning protrusion protruding toward the solenoid base on the outer circumferential side, and the solenoid base has a nose positioning protrusion protruding toward the solenoid base. This problem is solved by a configuration in which a nose positioning hole is provided into which the nose positioning protrusion is inserted.

[Operation] By inserting the nose positioning protrusion of the nose into the nose positioning hole of the solenoid base, the nose and the solenoid base are positioned with high precision.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 3. A plurality of wires 2 are slidably guided in the nose 1, and have a straight tip and an elliptical rear end. Further, the rear ends of the plurality of wires 2 are connected to the armature 3
is fixed at the tip of the Further, the nose 1 is provided with two nose positioning protrusions 1a protruding toward the solenoid base 4 near the outer periphery. In this embodiment, the case where the wire 2 and the armature 3 are integrally formed is illustrated, but the wire 2 and the armature 3 are made of separate bodies, and a wire pin is fixed to the rear end of the wire 2, and the nose A wire return spring may be disposed between the wire pin 1 and the wire pin, and the wire return spring may bias the wire 2 to the rear side.Also, even if the wire 2 and the armature 3 are integrally formed, the wire return spring may be disposed between the wire pin 1 and the wire pin. It may be provided.

A cylindrical core 5 is fixed to the bottom surface of the cup-shaped solenoid base 4 in an elliptical shape corresponding to the plurality of wires 2 . Each of the cores 5 is equipped with a cylindrical thread/idopobin 7 having flanges at both ends around which a solenoid 6 is wound. A flexible printed board 9 is disposed on the opposite side of the solenoid base 4 from the core 5 via an insulator 8, and a solenoid terminal 7a of the solenoid pobbin 7 is inserted into the solenoid base 4 and the insulator 8. Coil bobbin positioning hole 4
a, 8a are provided, and the flexible printed board 9 is provided with a hole into which the end of the solenoid 6 is inserted. Then, the solenoid terminal 7 of the solenoid pobbin 7
a is inserted into the positioning hole 4a of the solenoid base 4, the coil bobbin positioning hole 8a of the insulator 8, and the hole of the flexible printed board 9, and the end of the solenoid 6 is fixed to the flexible printed board 9 by soldering. As a result, the solenoid pobbin 7, insulator 8 and flexible printed board 9 are connected to the solenoid base 4.
are positioned and assembled together. Nose positioning holes 4b, 8b, and 9a are provided in the solenoid base 4, insulator 8, and flexible printed board 9 at locations corresponding to the nose positioning projections 1a of the nose 1, respectively.

Armature tip guide protrusions 10a are provided on the center side of the armature base 10 to guide the tip sides of the armatures 3 provided corresponding to the plurality of cores 5, respectively. Furthermore, armature positioning projections tab are provided on the outer peripheral side of the armature base 10 in correspondence with each of the armatures 3, and the armature 3 is provided with an armature positioning hole 3a that is inserted into the armature positioning projection 10b.

Furthermore, an armature base positioning protrusion 10C is provided between the armatures 3 of the near-RF near base 10 so as to engage with the outer periphery of the adjacent solenoid pobbin 7. This armature base positioning projection 10c also serves as an armature pilot guide for guiding the outer periphery of the armature 3, and is similar to the armature positioning projection t.
ab, and the armature 3 has a 7-
A vertical pilot guide cutout groove 3b is provided. Further, as described above, the wire 2 is fixed to the tip of the armature 3, and the plunger 11 is fixed to the portion corresponding to the core 5.

An armature stopper 12 made of metal is disposed on the armature base IO at a portion where the armature 3 abuts to prevent wear of the armature base 10. Further, an armature spring 13 is disposed between the armature base 10 and the armature 3,
This armature spring 13 causes the armature 3 to
The inner end of the armature stopper 12 is biased so as to come into contact with the armature stopper 12. In order to fix the armature spring 13 to the armature base 10, the armature base 10 is provided with a plurality of (three in the embodiment) armature spring locking holes 10d. An armature base holding portion 13a is formed which is inserted into the hole IQt4 and elastically engages with the armature base 10. Further, the armature tin ring 13 is formed with a plurality of armature stopper holding portions 13b (three in the embodiment) for fixing the armature stopper 12 to the armature base IO by elastic force.

Next, arrange the armature stopper 12 on the armature base 1G, and then attach the armature base retaining part 13a of the armature spring 13 to the armature base 1.
When inserted into the armature spring locking hole 10d of No. 0, the armature spring 13 is fixed to the armature base 10 by the spring action of the armature base engaging portion 13a. Also, armature stopper 12
is fixed to the armature base 10 by the spring action of the armature stopper holding portion 13b of the armature spring 13.

In the figure, reference numeral 14 indicates a cooling fin fitted to the outer periphery of the solenoid base 4 and the armature base 10, and reference numeral 15 indicates a print head mounting portion attached to the printer device.

Next, the overall assembly will be explained. As described above, the core 5, the solenoid bobbin 7 around which the solenoid 6 is wound, the insulator 8, and the flexible printed board 9 are integrally attached to the solenoid base 4. Further, an armature stopper 12 and an armature spring 13 are integrally attached to the armature base 10.

The nose positioning protrusion 1a of the nose 1 is connected to the nose positioning hole 9a of the flexible printed board 9 and the insulator 8.
, 8b and into the 7-z positioning hole 4b of the solenoid base 4. In this way, the nose 1 and the solenoid base 4 are positioned by the nose positioning protrusion 1a and the nose positioning hole 4b formed on the outer circumferential side, so the nose 1 and the solenoid base 4 are positioned with high precision.

Next, the wire 2 fixed to the armature 3 is inserted halfway into the nose l. Thereafter, the armature base 10 is brought close to the solenoid base 4, the inner part of the armature 3 is inserted between the armature tip guide protrusions 10a of the armature base IO, and the outer part of the armature 3 is inserted between the armature tip guide protrusions 10c. As a result, the armature 3 is positioned with sufficient clearance, and the armature positioning hole 3a of the armature 3 is located near the armature positioning protrusion 10b. Therefore, by inserting the armature positioning hole 3a into the armature positioning projection lob, the armature 3 can be positioned with high accuracy. Next, armature base 10
7--F Chua base 10 is placed on solenoid base 4 so that the outer periphery of solenoid bobbin 7 adjacent to armature base positioning protrusion 10c is engaged.

Thereby, the relative positions of the core 5 and the armature 3, ie, the plunger 11, are determined with high precision.

Finally, the cooling fins 14 are fitted into the solenoid base 4 and the armature base lO, and the outer periphery of the nose 1 and the outer periphery of the cooling fins 14 are sandwiched between the outer periphery of the nose 1 and the outer periphery of the cooling fins 14 using a fastener (not shown).Next, the operation will be described. When the solenoid 6 is not energized, the armature 3 is in contact with the armature stopper 12 due to the urging force of the armature spring 13. When solenoid 6 is energized, =
Plunger 11 is pulled by 75, and armature 3
The solenoid 6 rotates around the armature positioning protrusion tab of the armature base lO, the wire 2 protrudes from the front surface of the 7-z 1, and the solenoid 6 presses the paper against the platen via an ink ribbon (not shown) to perform dot printing. When it runs out.

The armature 3 is rotated and restored in the opposite direction by the biasing force of the armature spring 13, and comes into contact with the armature stopper 12.

[Effects of the Invention] As is clear from the above description, according to the present invention, the nose is provided with a nose positioning protrusion protruding toward the solenoid base on the outer peripheral side, and the solenoid base has the nose positioning protrusion. Since the nose positioning hole into which the nose is inserted is provided, the positioning accuracy of the nose solenoid base and the positioning accuracy of the solenoid base and the armature base are improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the printing head for a dot printer according to the present invention, FIG. 2 is an explanatory view of an armature guide portion, and FIG. 3 is an explanatory view of an armature spring portion. l: Nose. 1a: Nose positioning protrusion, 2: Wire, 3: Armature, 4: Solenoid base, 4b Two nose positioning holes, 5: Core, 7: Solenoid bobbin, 10: Armature base. In Fig. 1: North 1 1Q: North 1K 8 2: Wire 3 near gusset 17 4: Wire 2 side λ 4b: Nose °° 4-way 4-way 3 receiver (5; 7 7: Solenoid V'ki'hi'°n 1o: Armako 17 base Fig. 2 10: North °゛i standing, 1st type nime・tsu・, meeting 3:
7-Mason near 4: % cut 7 pieces Base 4b: No or large iL position length hole, 7: Solenoid 4 topobin Fig. 3 5: Ko 1 7: Solenoid hob 1o: 7-Ma Director of the Japan Patent Office Black 1) Mr. Akio 1 Display of the case 1985 Patent Application No. 123980 2 Title of the invention Print head for dot printer 3 Relationship with the person making the amendment Patent applicant address Shinjuku, Tokyo Ward Nishi-Shinjuku 2-1-1 Name (19
6) Citizen Watch Co., Ltd. Representative: Mutsuya Yamazaki 4 Agent Address: 204 Miwa Plaza Shinjuku, 2-20-2 Yoyogi, Shibuya-ku, Tokyo (Telephone number: 370-0244) Column 6 for detailed description of the invention in the specification; Contents of the amendment (1) From page 5, line 7 to line 15 of the specification, ``In addition,
It is possible to provide a wood flow side φ (omitted)...'' instead of ``The wire 2 and the armature 3 are fixed,
A wire return spring is disposed between the armature 3 and the nose l. ” is corrected. (2) In the drawings, Figure 1 will be corrected as shown in the attached sheet.

Claims (1)

[Claims] It consists of a nose with multiple wires slidably arranged on it, a solenoid base with multiple cores fixed around the circumference, a solenoid bobbin attached to these cores, and multiple armatures rotatably arranged. In the print head for a dot printer, the nose is provided with a nose positioning protrusion protruding toward the solenoid base on the outer peripheral side, and the nose positioning protrusion is fitted into the solenoid base. A print head for a dot printer characterized by being provided with a nose positioning hole.