JPH03166962A - Impact dot head - Google Patents

Abstract

PURPOSE:To achieve improvement of printing quality and improvement of reliability by a method wherein a resin film, a metallic plate material, a damper component, an elastic component, and a damper component are laminated from a side wherein a back stopper abuts against a rear of a lever. CONSTITUTION:A back stopper which the rear of a lever abuts against is pro vided, and a resin film 1a, a metallic plate material 1b, a damper component 1c, an elastic component 1d, a damper component 1e, and a difference in level regulating component 1f are laminated from the side wherein the back stopper 1 abuts against the lever 6. The back stopper 1 prevents a local sinking of the metallic plate material 1b when the lever 6 collides against the back stopper 1 securing total thickness of the damper component required for being capable of restraining effectively a rebound of the lever by containing the elastic compo nent 1d which is less in elastic deformation than the damper component between the damper components 1c, 1e. Therefore, stress to be loaded on the metallic plate material can be reduced and durability of the metallic plate material can be raised. Then a high reliable high efficient impact dot head can be obtained.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a print head for an impact dot printer.

[Conventional technology]

In the prior art, the backrest bar, which is the rest of the lever, is constructed by laminating members made of materials having a damper effect, such as a resin film, a metal plate, and rubber, from the lever side. [Problem to be Solved by the Invention] However, in such a conventional backstop configuration, in order to effectively suppress the rebound of the lever when the lever returns, the damper member is made thick, thereby reducing the movement of the lever in the process of colliding with the backstop collar. It is necessary to absorb energy, but by making the damper member thicker, the lever sinks deeper into the backstopper, which places excessive stress on the metal plate and repeats this, causing fatigue failure and decreasing durability. . In addition, if the metal plate material is made thicker or the damper material is made thinner to increase durability, the damper effect will be lowered and the rebound of the lever will not be suppressed, making it impossible to stabilize the drive at high speeds, making it impossible to increase the speed, and resulting in poor printing quality. It also had problems such as deterioration. SUMMARY OF THE INVENTION An object of the present invention is to solve these conventional problems and to provide an impact dot head that has excellent durability without impairing the function of the puck stopper. [Means for Solving the Problems] In order to solve the above problems, the impact dot head of the present invention has a pack stopper that the rear part of the lever comes into contact with, and the back stopper contacts the lever with a resin film or a metal plate material. , a damper member, an elastic member, a damper member, and a step L1 adjustment member. [Function] The back stopper of the impact dot head configured as described above has an elastic member that has less elastic deformation than the damper member, which is necessary to effectively suppress lever rebound. While ensuring the total thickness of the damper member, it prevents local sinking of the metal plate when the lever collides with the backstopper, reducing stress on the metal plate and increasing the durability of the metal plate, making it reliable. This makes it possible to obtain a high-performance impact dot head with high performance. [Examples] Examples of the present invention will be described below based on the drawings. FIG. 1 is a sectional view of the impact dot head of the present invention. The lower half of FIG. 1 shows the standby state in which the electromagnetic coil 2 is not energized, and the upper half shows the printing state in which the electromagnetic coil 2 is energized. During standby, the plunger 3 is attracted to the core 5 by the magnetic flux generated by the permanent magnet 4, so that the rear end of the lever 6 is pressed against the back stopper 1. At the time of printing, the electromagnetic coil 2 is energized to cancel the magnetic flux generated by the permanent magnet 4, release the attraction of the plunger 3 to the core 5, and make the wire 8 fixed to the tip of the repper 6 project by the force of the plate panel 7. When printing is completed, the electromagnetic coil 2 is no longer energized, and the plunger 3 is again attracted to the core 5 by the magnetic flux generated by the permanent magnet 4, so that the tip of the repper 6 collides with the pack stopper 1. FIG. 2 is an enlarged sectional view showing a state in which the lever 6 collides with the backstop collar 1. Back stopper metal part 1b
has a shape that does not protrude from the maximum load position 9 of the lever 6 toward the head center 10, and there is a groove between each lever 6 as shown by the broken line in FIG. 3 so that each lever 6 can be configured independently. It has a set shape. The backstop collar rubber portion 1c, the elastic body portion 1d, and the backstop collar rubber portion 1e have a disk shape, and for example, the backstop rubber portion 1C has a thickness of 0.5 mm. 3 mm +
The elastic body 1d is 0. 1mm, backstop 1
e is O, the thickness is about 7 mm, and the backstop rubber part 1
c, 1e have a structure in which the back stopper rubber portion 1e is thinner. The step adjustment member 1f is the plunger 3 of the core 5.
There is a member for adjusting the level difference between the facing surface of the back stopper metal part 1b, and the level difference is 0.01 mm, with the back stop metal part protruding toward the printing paper side (not shown). When the lever 6 collides with the backstopper 1, the backstopper metal part 1b
The impact force is distributed over a wide area of the back stopper rubber section 1C located below, and the back stop rubber section IC absorbs the impact force locally due to the dispersed impact force and the elasticity of the rubber material. However, the amount of local sinking is kept small by the elastic body 1d made of a material whose elastic deformation is not as large as that of the back stopper rubber part IC, and the impact force is reduced by the elastic body part 1d to the back stopper rubber part 1e. is propagated throughout and absorbed. Since the local sinking of the backstop rubber part is reduced, the sinking of the backstop collar metal part IC when the lever 6 collides is reduced, which reduces the deformation of the backstop metal part 1b and reduces the stress in the backstop collar metal part. It does not grow large and is prevented from breaking due to metal fatigue even after long-term use. FIG. 3 is an explanatory diagram of the arrangement of this embodiment as viewed from the wire tip side, and the broken lines indicate grooves provided in the backstop metal portion 1b. Although this embodiment has been explained using a disk-shaped back stopper shape, the same effect can be obtained with other shapes such as a ring shape or a band-shaped back stopper shape as long as it has the same structure as this embodiment. . In addition, as a specific material of this embodiment, the backstopper resin film portion 1a
as polyimide, as backstop metal part 1b as S
US304, fluororubber was used for the back stopper rubber parts 1c and le, and polyester was used for the elastic body part 1d and the step adjustment part if, but other materials with similar characteristics,
For example, the metal part is SPCG, SUS301, SUS3
05, SK-1, SK-2, SK-3, SK-4, SK
-5, etc., the back stopper rubber part is made of natural rubber, silicone rubber, urethane rubber, styrene rubber, isobrene rubber, acrylonitrile rubber, etc., and the elastic material is polyimide, polyamide, polyetheretherketone, polyethersulfon, polyamideimide, polysulfon. , polyetherimide, polyphenylene sulfide, polysulfon, and other polymer materials, SPCC, SUS3
01j SUS304, SUS305, SK-2, SK
Similar effects can be obtained by using thin plates of various metal materials such as -4. [Effects of the Invention] According to the present invention, the backrest against which the rear part of the lever comes into contact
By making the brim structure a laminate of resin film, metal plate, damper member, elastic member, damper member, and step adjustment member, the damper effect that reduces the rebound of the drive system consisting of wire, lever plunger, and leaf spring is enhanced. By stabilizing the operation during high-speed driving and reducing the sinking of the metal part of the backstop, it is possible to reduce the stress inside the metal and prevent fatigue failure, so the damper effect of the backstopper can be maintained for a long time, and the impact dot This has the effect of improving print quality and reliability of the head.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is an enlarged sectional view showing a state in which the lever in FIG. 1 collides with the back stopper. FIG. 3 is an explanatory diagram of the arrangement of the central part of FIG. 1 viewed from the wire tip side. 1. 1a. lb. lc. ld. le. 1 f. 2. 3. 4. Back stopper Back stop resin film part Back stop collar Metal part Back stopper rubber part Back stopper elastic part Back stop rubber part Step adjustment part Electromagnetic coil plunger Permanent magnet core lever Plate spring wire Maximum load position Above the center of the head

Claims (1)

[Claims] By selectively energizing a plurality of actuators, a lever attached to each actuator and a printing wire fixed to the lever are driven, and an impact dot head that forms dots by impacting the printing medium is driven. The lever has a back stopper that comes into contact with the rear part of the lever, and a resin film, a metal plate material, a damper member,
An impact dot head characterized in that it is constructed by laminating a damper member and an elastic member that undergoes less elastic deformation than the damper member.