JPS62124960A - Damping material for printer head - Google Patents

Abstract

PURPOSE:To damp the impact force of an armature with a rubber material and at the same time, improve the abrasion resistance of a damping material by using a damping material having a rubber material applied at least on one surface of a high molecular film. CONSTITUTION:An armature 4 is placed in a magnetic gap defined by the liberated edge of a core 2a and a groove 1a. A silicon-based rubber material 17 is applied on the bearing surface of a high molecular film 16, and the rubber material 17 is fixed on the isolated edge of the core 2a, thus making up a damping material 18. When printing is ended, the armature 4 is attracted toward the core 2a by the magnetic force of a permanent magnet 3 due to the deexcitation of a solenoid 8. Then the armature 4 is to run into the collision surface of the damping material 18. In this case, however, the damping material 18 is allowed to moderate the impact force and shearing force through elastic deformation of the rubber material 17.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a wire dot printer head, and more particularly to a slow i material for a printer head that has been improved to improve the abrasion resistance of a cushioning material that softens the collision between an armature and a core. .

<Prior art> In general, in a wire dot printer head, the armature that supports the printing wire is driven by a magnetic circuit, but when the armature is attracted by the core, in order to soften the collision force, there is a A resin film made of a polymer film such as polyester may be placed as a cushioning material. In addition, the armature has its base end supported by a leaf spring and moves on an arc using the support as a fulcrum, so there is a relative lateral motion component between the armature and the collision surface of the core. It is preferable to use a cushioning material that reduces the coefficient of friction between the two members.

<Problem to be solved by the invention> By the way, with the increase in printing speed and the increase in printing force for printing multiple copies, it has become necessary to use a large magnetic flux to cause the armature to collide with the core at high speed and with a large impact force. It has become. Therefore, due to the movement of the armature as described above during a collision, not only the impact force but also the shearing force generated from the lateral motion component is repeatedly applied to the cushioning material, causing problems with the wear resistance of the cushioning material. Ta.

Therefore, it is conceivable to take measures against the above-mentioned wear resistance problem by increasing the thickness of the cushioning material, or by using a plurality of cushioning materials and utilizing the slippage between them.

However, in either case, the gap in the magnetic path increases, and the magnetic force decreases, making it difficult to cope with faster printing and increased printing force.

In view of these problems with conventional wire dot printer heads, the main objectives of the present invention are to increase the speed of printing and to develop an armature that can sufficiently withstand the large impact force and shearing force that accompanies the increase in printing force. Entered the market to provide cushioning materials for printer heads.

<Means for Solving the Problems> According to the present invention, an armature supported by a spring in a magnetic gap of a magnetic circuit is driven by intermittent magnetic flux in the magnetic gap. With this, in a wire dot printer head of the type that drives a printing wire fixed to the armature via an arm, a core is provided on the free end surface of the core that attracts the armature in order to alleviate collisions of the armature. A cushioning material for a wire dot printer head, characterized in that the cushioning material is made of a polymer film, and at least one surface thereof is coated with a rubber material, or the cushioning material is made of a polymer film. This is achieved by providing a cushioning material for a printer head, which is characterized in that the collision surface of the polymer film is coated with a solid lubricant.

<Function> In this way, by using a cushioning material coated with a rubber material on at least one side of the polymer film Q, the impact force of the armature can be alleviated by the rubber material, and furthermore, it is possible to reduce the impact force of the armature by using the rubber material. Since the armature can be smoothed and relaxed by the lubricant, the wear resistance of the cushioning material can be greatly improved.

<Embodiments> Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a partially cut away printer head according to the present invention. A yoke 1 made of a magnetic material and a core member 2 also made of a magnetic material having a required number of cores 2a spaced apart in the circumferential direction are screwed together by screws 6 so as to sandwich an annular permanent magnet 3 between them. ing. Further, a plate spring 5 is held between the yoke 1 and the annular permanent magnet 3, and an armature 4 is supported at the free end of the temporary spring 5. An arm 9 is fixed to the other end of the armature 4, and one end of a printing wire 10 is fixed to the free end of the arm 9. The printing wire 10 is attached to the yoke 1 by a screw 7.
The wire passes through wire guides 131 to 135 provided inside the bed nose 11 screwed to the bed nose 11, and its tip reaches the free end surface 11a of the bed nose. A solenoid 8 is wound around each of the cores 2a.
A groove 1a for receiving the armature 4 is cut in a portion of the yoke 1 facing the free end of the yoke.

Therefore, as best shown in FIG. 2, the armature 4 has a core 2a M,! It is placed in a magnetic gap defined by the i-plane and the inner side surface of the groove 1a. A groove 15 is formed in the armature 4 in order to reduce the intercalary mass so that the magnetic flux density is not increased as much as possible.

When solenoid 8 is not energized, armature 4
is urged toward the free end side of the core 2a by the attractive force of the permanent magnet 3. At this time, when the solenoid 8 is excited in a direction that cancels out the effect of the permanent magnet 3, the armature 4 is elastically separated from the free end surface of the core 2a by the restoring force of the leaf spring 5. At this time, the printing wire 10 fixed to the armature 4 via the arm 9 is connected to the free end surface 1 of the herad nose 11.
The desired printing can be performed by protruding from 1a and hitting an ink ribbon (not shown) and the paper surface.

A ring 12 fixed to the outer periphery of the core member 2 is a permanent magnet 3
By somewhat magnetically bridging , the magnetic internal resistance of the permanent magnet 3 is reduced, and the armature 4 is
This is to enable the magnetic force of the permanent member 153 to be canceled out with a relatively small amount of electric power when the solenoid 8 is energized to move it away from one end face. By appropriately adjusting the gap between the ring 12 and the outer periphery of the yoke 1, it is possible to reduce the amount of power that should be supplied to the solenoid 8 for canceling the magnetic force of the permanent magnet.

As clearly shown in FIG. 3, the cushioning material 18 is formed by coating the seating surface of the polymer film 16 with rubber vJ17 made of silicone rubber, for example, and fixing the rubber material 17 to the free end surface of the core 2a. It is configured.

During printing, the magnetic force of the permanent magnet 3 is canceled out by the excitation of the solenoid 8, so the armature 4 is at a position indicated by the two-dot chain line away from the impact surface of the buffer material 18 due to the restoring force of the temporary spring 5. Next, at the end of printing, the solenoid 8 is de-energized and the armature 4 is attracted toward the core 2a by the magnetic force of the permanent magnet 3. Then, the armature 4 collides with the collision surface of the cushioning material 18, but in the cushioning material 18 configured as described above, the impact force P
C and the shearing force ps are alleviated by elastic deformation of the rubber material 17.

In this embodiment, the cushioning material 18 is constructed by coating the seat surface of the polymer film 16 with a rubber material 17, or, as shown in FIG. A solid lubricant 19 such as molybdenum sulfide or fluororesin may be coated, and in this case, the armature 4 is made to slide by the lubricating action of the solid lubricant 19, thereby mitigating the impact force Pc and shearing force PS. I will do it.

Further, as shown in FIG. 5, the seat surface of the polymer film 16 is coated with a rubber material 17, and the polymer film 16 is
The tM tar material 18 may be constructed by coating the collision surface with a solid lubricant 19. In this case, the impact force J P c is mainly alleviated by the elastic deformation of the rubber material 17, and the shear force PS is alleviated by sliding the armature 4 due to the lubricating action of the solid lubricant 19, so that the rubber material 1
The characteristics of the solid lubricant 7 and the solid lubricant 19 can be suitably utilized.

Note that the rubber material 17 in the present invention is not limited to silicone rubber, but may be any other rubber material that can be elastically deformed, and similarly, the solid lubricant is not limited to molybdenum disulfide or fluororesin. Other solid lubricants may be used as long as they have a lubricating effect. In addition to coating the seat surface of the polymer film 16 with the rubber material 17,
The collision surface or both surfaces of the polymer film 16 may be coated.

<Effects of the Invention> As described above, according to the present invention, it is possible to effectively alleviate the impact force and shear force caused by the collision of the armature with a rubber material or solid lubricant, thereby improving the wear resistance of the cushioning material. can improve sexual performance.

Furthermore, since there is no need to increase the thickness of the cushioning material or use multiple sheets, there is no need to increase the gap between the magnetic path between the armature and the core, making it possible to support faster printing and increased printing power. It becomes possible to drive the armature without impairing the increase in magnetic force.

[Brief explanation of drawings]

FIG. 1 is a partially cut away side view of a wire dot printer head according to the present invention. FIG. 2 is a sectional view taken along the line It-It in FIG. FIG. 3 is a side view conceptually showing the state of collision between the armature and the cushioning material. FIG. 4 is a cross-sectional view of a buffer (A) showing a second embodiment of the present invention. FIG. 5 is a cross-sectional view of a buffer material showing a third embodiment of the present invention. 1...Yoke 1a...Groove 1b...Periphery 2...Core member 2a...Core
3... Permanent magnet 4... Armadure 5... Plate 6.7... Screw 8... Solenoid 9.
...Arm 10...Printing wire 11...
Head nose 11a...Free end surface 12...Rings 131-135...Wire guide 15...Groove 16...Polymer film 1
7...Rubber material 18...Buffer material 19...Solid lubricant Figure 1

Claims (3)

[Claims] (1) An armature supported within a magnetic gap of a magnetic circuit by a spring is driven by intermittent magnetic flux within the magnetic gap, thereby driving a printing wire fixed to the armature via the arm. In a wire dot printer head of the above-mentioned type, a cushioning material is provided on the free end surface of the core that attracts the armature in order to alleviate collisions of the armature, the cushioning material is made of a polymer film, and at least A cushioning material for a printer head characterized by having either side coated with a rubber material. (2) The cushioning material for a printer head according to claim 1, wherein a collision surface of the cushioning material is coated with a solid lubricant. (3) Driving the armature supported within the magnetic gap of the magnetic circuit by a spring by intermittent magnetic flux within the magnetic gap, thereby driving the printing wire fixed to the armature via the arm. In the type of wire dot printer head, a buffer material is provided on the free end surface of the core that attracts the armature in order to alleviate collisions of the armature, the buffer material is made of a polymer film, and A cushioning material for a printer head, characterized in that the collision surface of the polymer film is coated with a solid lubricant.