JPS61237656A - Printer head - Google Patents

Abstract

PURPOSE:To speed up the outgoing and returning actions of an armature by a method in which a supporting point is formed between two electromagnets and an armature to drive a recording electrode is rotatably supported and faced the two electromagnets. CONSTITUTION:An iron core 18 consists of two cores 19 and 20 and a supporting point 21 positioned between the cores 19 and 20. Coils 22 and 23 are wound around the cores 19 and 20, respectively, to form two electromagnets 24 and 25. The electromagnet 24 is for printing signals, and the other electromagnet 25 is for stop signals. An armature 27 whose round receiver 26 is coupled with the point 21 is set up to a length enough to face the cores 19 and 20 and turned around the point 21. When a printing signal is given to the electromagnet 24, the upper end of the armature 27 is attracted by the electromagnet 24, and the recording electrode 29 is made to approach the counter electrode 6. Immediately after the printing signal disappears, and when a stop signal is given to the electromagnet 25, the returning timing of the armature 27 is quickened by the attraction of the electromagnet 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printer head that forms dots by driving a recording stylus and prints characters and figures using combinations of these dots.

Conventional technology In general, printers that drive a recording stylus to form dots include impact-type printers in which the recording stylus collides with the recording paper, and printers that drive the recording stylus to form dots on the recording paper, while others are impact-type printers in which the recording stylus is brought close to the recording paper and the dots are attached to the tip of the recording stylus. There are some types that use electrostatic force to make the ink fly.

In any of these types of printers: - To operate the recording needle, the recording needle is directly or indirectly connected to an armature driven by an electromagnet.

Problems to be Solved by the Invention One of the important performances required of a printer is high-speed printing. In order to achieve this high-speed printing, the recording stylus must operate at high speed, but in conventional drive mechanisms, the electromagnet only acts on the suction of the armature, and its return is performed by a spring. However, there is a limit to its high-speed drive due to the mass of the armature.

In addition, the stopper is used to stop the armature when it returns, but when it returns, the armature bounces and requires a considerable amount of time to come to a complete standstill. It is something that cannot be changed.

Means for Solving the Problems A fulcrum is formed between two electromagnets, and an armature that drives the recording electrode is rotatably supported by the fulcrum and is opposed to the two electromagnets.

The working armature can be driven electromagnetically by an electromagnet during both its advancing and returning operations.
The operation can be made faster, and by electromagnetically attracting and restraining the armature upon return, bouncing during stopping can be eliminated and one cycle time can be shortened.

Embodiment An embodiment of the present invention will be described based on the drawings. First, the printer main body 1 has a guide shaft 2 horizontally arranged on the front side of the printer main body 1.
A carrier 3 is attached to the guide shaft 2 so as to be able to reciprocate. On this carrier 3, an ink tank 4 and a head main body 5 are sequentially stacked. Further, in the center of the printer main body 1, a cylindrical counter electrode 6 is provided horizontally. This counter electrode 6 has a rubber layer 8 made of conductive rubber integrally provided on the surface of a support member 7 in the shape of a round shaft. A recording paper 9 is wound around this counter electrode 6, and this recording paper 9 is pressed so as to be in close contact with the surface of the counter electrode 6 by rollers 10 and 11 located above and below the counter electrode 6. .

Therefore, the ink 12 is contained inside the ink tank 4.
An ink film forming member 16 having a slit 15 for sucking up the ink 12 by capillary action to form an ink film 14 is provided on the negative side thereof.

Next, the head main body 5 has a frame 17 fixed above the ink tank 4, and an iron core 18 is attached to the frame 17. This iron core 18 is
It consists of two cores 19.20 and a fulcrum 21 located between these cores 19.20. The end of this fulcrum 21 protrudes beyond the ends of the core 19 and 20, and its tip is formed into a circular shape. And said core 19.20
A coil 22, 23 is wound around each of the electromagnets 24, 25 to form two electromagnets 24, 25. These electromagnets 24
．． 25, one electromagnet 24 is for a print signal, and the other electromagnet 25 is for a stop signal.

Next, an armature 27 is provided on the fulcrum 21 and has a circular receiver 26 engaged therewith. This armature 27 is set to have a length opposite to the core 19, 20, and is provided so as to rotate about a fulcrum 21. A conductive arm 28 is attached to the end of this armature 27, and a recording electrode 29 as a recording needle is fixed to the end of this arm 28. The recording electrode 29 has its tip located within the ink film 14 formed by the ink film forming member 16 of the ink tank 4 .

Further, a protrusion 30 is formed on the armature 27, and a leaf spring 31. is in contact with the armature 27, and the armature 27 is urged in a direction approaching the electromagnet 25 for stopping. Further, a cover plate 32 that covers the electromagnets 24.25 and the armature 27 is fixed to the frame 17, and the cover plate 32 has the armature 2
A stopper 33. which abuts against 7 and sets its range of motion.
34 is provided so that its position can be changed freely.

Thus, a power source 35 is connected between the counter electrode 6 and the recording electrode 29, and when the recording electrode 29 is returned between the two, the ink], 2
A high voltage is applied that is set to a level that prevents the particles from flying off.

In such a configuration, the electromagnets 24 and 25 are energized in synchronization with the reciprocating movement of the carrier 3. And recording paper 9
is sent by the rotation of the counter electrode 6. especially,
Since the surface of the counter electrode 6 is a rubber layer 8, the frictional resistance is large and the recording paper 9 is sent out without slipping.

Therefore, the electromagnets 24 and 25 are energized at the timing shown in FIG. That is, by giving the print signal a to the electromagnet 24, the armature 27
The upper end of the recording electrode 29 is attracted to the electromagnet 24, and the recording electrode 29 is brought close to the counter electrode 6.

This proximity of the recording electrode 29 increases the electric field between it and the counter electrode 6, causing the ink 12 attached to the tip of the recording electrode 29 to fly. As a result, the driver 1- is printed on the recording paper 9.
is formed. Immediately after the print signal a disappears, a stop signal is given to the electromagnet 25. At this time, the armature 27 returns to its original position due to the force of the leaf spring 31, but the return timing is accelerated by the attraction force of the electromagnet 25, and the armature 27 that is close to the electromagnet 25 is magnetically attracted and bounces at the stop position. There is no. Therefore, the next print signal a can be applied immediately after the armature 27 returns, and the operation cycle of the armature 27 can be accelerated.

Note that the direction of generation of magnetic flux and its order will be explained based on FIG. 3. First, the core 1 of the electromagnet 24 is
9, magnetic flux in the direction of ■ flows. At the same time, electromagnet 25
A magnetic flux (■) flows through the core 20, but this is extremely weak and does not affect the operation of the armature 27. Next, in response to the stop signal, a magnetic flux (■) flows through the core 20 of the electromagnet 25. At the same time, the core 19 of the electromagnet 24
A magnetic flux (■) flows through, but this is also extremely weak and does not affect the operation of the armature 27.

Moreover, the magnetic fluxes ■ and ■ are armature 27 and core 19.2.
Since it acts on the part that is separated from 0, the influence on the armature 27 is even lower.

In such a state where magnetic flux is generated, when the print signal a is generated, the magnetic flux ■ acts in the direction of eliminating the residual magnetism caused by the magnetic flux ■ at the core 20 of the electromagnet 25, so that the core 19
The suction of the armature 27 to is more efficient. Furthermore, when the stop signal b is generated, the magnetic flux (2) acts in the direction of eliminating the residual magnetism caused by the magnetic flux I at the core 19 of the electromagnet 24, so that the armature 27 is attracted to the core 20 more effectively.

Next, in order to eliminate the influence of residual magnetism in the core 19.20 portion, it is necessary to provide an inclusion such as mica on the end face of the core 19.20, or as shown in FIG.
9. A minute protrusion 36 may be formed on the end face of 20. This protrusion 36 may be formed on the armature 27 side.

In the above embodiment, a printing method in which ink is electrostatically ejected was explained, but this printing method is a contact type printing method in which dots are formed by bringing the tip of the recording electrode into contact with the recording paper. It can also be implemented in an impact type method in which dots are formed by colliding an object or needle with recording paper.

Effects of the Invention The present invention provides an electromagnet that is installed between two electromagnets as described above.
- Since the armature is rotatably mounted on the pivoted fulcrum, the armature can be driven in any direction by selectively energizing these electromagnets, increasing the driving speed; By using one electromagnet for the print signal and the other electromagnet for the stop signal, it is possible to prevent bouncing when the armature returns, and this allows the armature to be biased in one direction by a spring, etc. The armature can also be driven at high speed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal side view, FIG. 2 is a timing chart 1 of a print signal and a stop signal, and FIG. 3 is a longitudinal side view showing the flow of magnetic flux. FIG. 4 is a perspective view with a portion of the ink tank section cut away, FIG. 5 is a perspective view of the printer main body, and FIG. 6 is a partial longitudinal sectional side view showing a modified example of the electromagnet.

Claims (1)

[Scope of Claims] 1. A printer characterized in that a fulcrum is formed between two electromagnets, and an armature connected to a recording needle is opposed to each of the electromagnets and rotatably attached to the fulcrum. head. 2. The printer head according to claim 1, wherein one electromagnet receives a print signal, and the other electromagnet receives a stop signal. 3. The coil of each electromagnet is energized so that the direction of the magnetic flux due to the print signal passing through the core of each electromagnet is opposite to the direction of the magnetic flux due to the stop signal. printer head.