JPH037351A - Impact dot head - Google Patents

Abstract

PURPOSE:To eliminate loss of printing power and wire driving capacity of an impact dot head, and to improve durable performance by managing grease coating amount and grease quality, and coating a necessary position with grease. CONSTITUTION:A fulcrum position of a fulcrum support for rotating a lever 1 is coated with grease (a) of No.1 to No.5 of consistency 0.1X10<-3>cc to less than 10X10<-3>cc. An engaging part I of the lever 1 with a return spring 2 is coated with grease (b) of No.0 to No.4 of consistency 1.0X10<-3>cc or less, Further, the surface of a core to be collided or slid with the attraction part of an armature 4 is coated with grease (c) of No.0 to No.5 of consistency 0.7mm thick or less. Then, a wire 7 is slid in a state that grease (d) is filled at an end wire guide 21, and the grease (d) is introduced into the hole 24 of the guide 21 when it is slid. As a result, the hole 24 is not introduced with paper chips, ink pigments (g), thereby improving its durability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a print head for an in-vacuum one-dot printer.

[Conventional technology]

Figure 1O shows the impact dot head. In the standby state, the lever 1 is pressed against the damper 3 by the spring force f of the return spring 2 in contact with the lever 1.
When printing, a current is passed through the electromagnet 5 to the armature 4. [! A lift force F acts. The lever l integrated with the armature 4 rotates about the fulcrum part 6 due to the action of the electromagnetic force F that exceeds the return spring force f.
The armature 4 is sucked by performing a rotational movement as indicated by arrow A.

The tip of the lever l: The wire 7 attached to the IJ by brazing or connecting the wire guide 8 due to this movement.
The tip of the wire 1 will be projected while being held in place.

The protruding wire 7 collides with the printing paper surface lO via the ink ribbon 9, leaving ink marks forming the characters.
Due to the spring force f of the return spring 2 in contact with , the rotary movement of arrow B is performed with the fulcrum portion 6 as the center of rotation, and the device returns to the standby state. In the course of this series of wire drive movements, wear on the fulcrum portion 11, contact wear on the engagement portions 12 of the lever 1 and return spring 2, and wear on the sliding portions 24 of the wire guide 8 and wire 7 always occur. Furthermore, when the printed paper surface is located far away, the armature 4 that is attracted before the wire 7 collides with the printed paper surface 10 is the core 1 which is the iron core of the electromagnet 5.
Since the contact surface 13 of the armature 4 and the core 14 directly collides with and slides on the armature 4, collision and tg dynamic wear also occur.

(1) Regarding the wear of the lever fulcrum part 11, as shown in FIG. 11, there are two main types of wear: sliding wear that occurs during high-speed rotation of the lever 1 (see FIG. 11(a)), and wire wear that occurs on the printed paper surface 10. 1 collision or armature 41ji to core 14
In the event of an emergency, the part 18 of the fulcrum receiver of the lever 1 lifts up from the fulcrum part 6, resulting in collision wear (Fig. 11(b)). Wear of the lever fulcrum part 11 disturbs normal wire drive movement and deteriorates print quality. This will significantly reduce the responsiveness of the wire drive. Therefore, in the prior art, in order to improve the wear resistance of the fulcrum receiver part 18 of the lever 1 and the lever fulcrum part 6, a high hardness material with excellent wear resistance 11 is used or A spacer 17 made of a material t4 with excellent wear resistance was provided on the sliding surface as shown in FIG. 11(C). Other techniques include those that perform surface hardening treatment on the sliding surfaces, and techniques that increase the sliding surface area in terms of shape to reduce blood pressure. Further, regarding collision wear of the fulcrum part 11, the spring force of the fulcrum part spring 16 is increased in order to prevent the part 18 of the fulcrum receiver of the lever l from floating.

(2) As the lever 1 and return spring 2 wear out, the 12th
As shown in the figure, the spring breakage of the return spring 2 or the wear of the contact part of the lever l with the return spring 2 progresses, and as a result, the necessary spring force of the return spring 2 cannot be obtained and the response ability of the wire drive decreases. Invitation and return spring Jre, or lever J
This causes problems such as IT distortion. Conventionally, in order to prevent these, the return spring holder 19 has been provided by integrally or separately joined to increase the contact area of the engagement portion of the lever 1 with the return spring 2, or the return spring 2 that contacts the lever 1 has been provided. A cap 20 with excellent wear resistance was attached to the tip.

(3) Sliding wear between the wire 7 and the wire guide 8 is particularly noticeable at the wire guide portion 21 at the tip that contacts the ink ribbon 9. As shown in FIG. 13, the pigment in the ink applied to the ink ribbon 9 and the paper powder g on the surface of the printed paper penetrate and adhere to the hole 24 of the wire guide 21 at the tip, and the hole 24 of the wire guide 21 and the wire This is because it plays the role of polishing powder in the sliding movement of step 7. Wear of the wire 7 and the wire guide 21 reduces the diameter of the wire 7 and enlarges the diameter of the hole 24 of the wire guide 21, making it difficult to obtain uniform ink marks and causing a decline in print quality. In the prior art, as shown in FIG. 13, materials with excellent abrasion resistance are selected for the wire 7 and the wire guide 21 to prevent paper dust and ink pigments from entering the wire guide portion 24. Then, attach the oil-impregnated felt 22 to the wire guide 2 at the tip.
It was inserted into the back of 1.

(4) As shown in Figure 14, as the IJ7 bumping and sliding wear of the armature 4 and core 14 progresses, the normal wire drive movement is impaired by wear particles, resulting in a decrease in wire drive responsiveness of 1 m. . In the conventional technology, the material τq of the armature 4 and core 14 is made of a highly hard material with excellent wear resistance, or measures are taken by surface hardening treatment.

[Problem to be solved by the invention]

However, the conventional technology had the following problems.

(1) Regarding the technology to prevent wear of the lever fulcrum part 11, the material of the fulcrum receiver of the lever l that has excellent abrasion resistance for the part 18 and the fulcrum part 6 is made of silicone. [-Various alloys such as Vermendur are available, but these are expensive and unsuitable for manufacturing the lever 1 having a complicated shape. Furthermore, the wear resistance of technologies such as using these materials and surface hardening is only about 2'lIi, and materials such as ruby ceramic, which has excellent wear resistance, are expensive!
! In addition to the difficulty of mounting, it is also impossible to construct a magnetic circuit to obtain the necessary electromagnetic force. Increasing the fulcrum presser spring and increasing the sliding area entails an increase in sliding resistance.In particular, increasing the sliding area requires increasing the size of the lever l, which reduces the response performance of the wire drive.

(2) The conventional method of providing an engaging cloth holder 19 on the lever 1 to prevent wear of the lever 1 and the return spring 2 increases mold on the lever 1 and causes a decrease in the responsiveness FIR of the wire drive. The receiver has the disadvantage of increasing the size of the impact dot head in order to secure space for the surface 19. Further, the conventional technique of attaching the cap 20 to the return spring 2 has the problem of increasing the number of parts and reducing ease of assembly, resulting in increased costs.

(3) Wear between the wire 7 and the wire guide 21 at the tip
Examples of I-measures include carbide wire and ceramic guides, but these are very expensive.
It becomes a υ prisoner with a cost of 1. Also, 22 l of felt
The +j method is insufficient for the ink pigment to enter the wire guide hole 24, and the oil-impregnated felt 22111 method has poor workability and is a factor in increasing costs.

(4) Regarding the wear of the armature 4 and core 14, the conventional technique of using materials with excellent wear resistance requires that the armature core material be made of a magnetic material, so 841f! - There is a limit to the improvement in wear and tear, and it cannot be said to be a sufficient countermeasure.

An object of the present invention is to improve the durability of the impact dot head due to wear in various parts at a low cost without reducing the response performance of the wire drive of the head.

[Means to solve the problem]

In order to solve the problems of the prior art, the impact dot head of the present invention uses electromagnetic force to drive the armature, and a wire attached to the tip of a lever that is integrated with the armature prints via an ink ribbon. Printing effect that performs printing by colliding with the paper surface]・
In the dot head, (1) Apply grease of size 1 or more but less than size 6 to the sliding part of the lever fulcrum. 1×10-3cc or more 1O×10-
It is characterized by applying less than 3cc.

(2) The engagement portion between the return spring and the lever is characterized by applying 1.0×10 −3 cc or less of grease of No. 0 or more but less than No. 5.

(3) The back side of the tip of the wire guide located at the tip is semi-sealed and is filled with grease of No. 00 or more but less than No. 5.

(4) Apply grease of size 0 or more and less than size 5 to a thickness of 0.7 m on the surface of the core that touches or slides on the armature suction part.
It is characterized by being coated in a thickness of less than m.

〔Example〕

The fulcrum holder that allows the lever 1 to rotate is the part 18, and the fulcrum part H is greased with grease a of size 1 or more and less than size 5.
Applied less than cc. Figure 2 (a), Figure 2 (b)
The printing force exerted by the wire on the 0M1 axis and the number of times the wire is driven until wear occurs on the applied part are measured to show the correlation between the grease application level and the performance of the impact dot head based on experimental results. Experiments have shown that the abrasion resistance effect of the Grease A coating type is rapidly lost when the amount is less than 0.1 x 10-3 cc, and that the wire drive 16 x 10" recovery required for energized use is cannot be secured, and l
At 0x10-3 cc or more, the abrasion resistance effect is ensured, but the viscosity of the grease increases especially at low temperatures and obstructs the rotational movement of the lever 1, so the printing force that is said to be necessary for printing is lower. It becomes impossible to obtain 3N. Grease a
If the material is less than No. 1, the viscosity is low and a sufficient effect on impact wear resistance cannot be obtained, and if the material is No. 5 or more, it is necessary. Figure 1 (a) shows the first embodiment of the present invention. .

The printing force 3n that is generated is no longer tq. As can be seen from Figure 2 (a) and Figure 2 (b), grease of size 1 or more but less than size 5 is O, 1xlo-3cc or more 10x10-3c.
According to the present invention, which coats less than c, the necessary printing force is ensured, and the abrasion resistance of the fulcrum portion 11 is improved by more than B (g).

The engagement part between the lever 1 and the return spring 2 is coated with grease b, which is less than No. 4, in an amount of 1.0 x 10 -3 cc or less. Figures 3(a) and 3(b) show the correlation between this grease application and the performance of the impact dot head based on experimental results.The vertical axis shows the printing force exerted by the wire and the occurrence of wear on the applied part. The number of wire drives up to J times has been taken. According to experiments, the application M of grease b is
In other words, if the coating is higher than ff1OCC, the wear resistance effect will be poor and the wire drive 1, which is normally required for printing.
You can secure 6Xlo' times or more. However, if the coating amount exceeds 1°0 x 10-3 cc, the wear-resistant effect is ensured, but the viscous force of grease b cannot be ignored, especially at low temperatures, and the printing force of 3N, which is said to be necessary for printing, is reduced. You will not be able to get 1. Grease 1] is less than No. 0, the viscosity is too low and the retention of grease B is ff.
1i L <As a result, there is no abrasion resistance effect, and the condition is 4.
If the number is higher than 11, the printing power that is said to be necessary will not be achieved. As can be seen from FIGS. 3(a) and 3(b), the present invention, which applies grease of size 0 or more but less than 4 to 1.0×10-3 cc or less, ensures the necessary printing power. , and the wear resistance of the lever/return spring engaging portion 12 is approximately twice as high as that of the direction 1. ．． I will do it.

Apply grease C of size 0 and less than size 5 to a thickness of 0 on the core surface 13 that touches or slides on the suction part of the armature 4.
．． It is coated to a thickness of 7 mm or less. Figures 4(a) and 4(b) show the correlation between the grease application m/preparation and the performance of the impact dot head based on experimental results.The vertical axis shows the printing force exerted by the wire and the occurrence of wear on the applied part. The number of times the wire is driven is calculated. Experiments have shown that when the thickness of Grease C's cloth door is made thicker than 0.7 mm, the wear resistance effect is ensured, but the air gap between the armature suction surface and the core surface in the standby state is almost Especially at low temperatures, the viscous force of the grease makes it impossible to maintain the printing force of 3Nll, which is said to be necessary for printing. Similarly, if the grease is less than No. 0, the viscosity will be low and it will not be effective enough to withstand one nail percussion wear, and if the grease is No. 5 or higher, the required printing force of 3N will not be achieved. As can be seen from Fig. 4(a) and Fig. 4(b), the grease of size 0 or more and less than size 5 was applied to a thickness of 0.
By applying the coating to a thickness of 7 mm or less according to the present invention, the necessary printing force can be secured and the wear resistance of both the armature and core contact surfaces 13 can be improved by more than 8 times.

In order to explain in detail claim (3) of the present invention in the distal wire guide 21 shown in FIG. 1(a), a partial configuration diagram is shown in FIG. 1(b). As shown in FIG. 1(b), the back side of the tip wire guide 21 is
The upper surface except for the upper surface is surrounded by the side wall j and upper wall k of the nose and the surface l of the second wire guide 8 from the tip to form a semi-sealed shape, and the inside is filled with grease d of size 00 or more but less than No. 5 ( Figure 1 (C)). As shown in FIG. 1(d), when the wire 7 is driven and performs a sliding movement A in a state filled with grease d, the hole 2 of the wire guide 21
Grease d gets into 4. As a result, the wire guide 21
Paper powder and ink pigments do not enter the holes 24, and durability is significantly improved. The level of grease d is 5
In cases where the grease d increases in viscosity, it becomes difficult to fill the grease d, and it becomes difficult to enter the hole 24 of the wire guide 21. Therefore, the effect of preventing paper dust and ink from entering the hole 24 of the wire guide 21 becomes less effective. It will no longer work properly.

Examples related to item (1) regarding other lever fulcrum structures are shown in Figs. 5(a) to (f), Figs. 6(a) and (b), and Fig. 7(
Figures 5 (a) to 5 (d) shown in a) and (b) have a structure in which the lever fulcrum shape is not a structure in which a part of the lever 1 is a concave fulcrum receiver part 18 as in the first embodiment. One end or a portion of the flat plate is supported by a fulcrum holding member to serve as a fulcrum that is the center of rotation of the lever 1. Figure 5(e)(f)
The shape of the lever fulcrum in FIG. 1 is a case where a part of the lever 1 is projected and the projection is used as the fulcrum 6 for the rotation of the lever 1. Grease a is applied to these. Due to the quality of the grease a, it can be maintained for a long time, and the same effect as in the first embodiment is achieved.

In FIG. 6, the flat lever is bent and supported by a fulcrum holding member with the bent portion as a fulcrum.

FIG. 7 shows the case of the fulcrum axis sideways path. A through hole is provided at the fulcrum portion of the lever l, and the fulcrum shaft 30 is passed through the through hole. The fulcrum shaft 30 is held by upper, lower, left and right support surfaces, and the lever 1 rotates around the fulcrum shaft 30.

5 and 8 are shown as other examples of the term (4) regarding the distance between the core and the armature. In FIG. 5(a), the upper end of the electromagnet protrudes beyond the core 14, and the surface of the core 14 is the surface of the electromagnet. It shows the case where it is located within. In FIG. 8, since the lever is a flat plate, the armature 4 does not protrude from the lever l as in the first embodiment.

Another embodiment of the wire guide section at the tip is shown in FIG. FIG. 9 shows a +ill structure in which the wire kite 21 at the tip has a concave cross-sectional shape, and the wire guides are stacked one on top of the other while being held by the guides. Also, the wire guide 21 at the tip has an opening 1 of any shape on the side for performance purposes.
” section m is provided.

〔Effect of the invention〕

According to the present invention, (1) Grease of less than No. 1 minus No. V5 is applied to the sliding part of the lever fulcrum. 1×10-3cc or more 1O×10
-Less than 3cc is applied.

(2) Fit the engagement part of the iu return spring and lever with a tension size 0 or higher
Grease of less than 1. It is applied to OxlCM3cc or less.

(3) The back side of the tip of the wire guide located at the tip is made into a t1 closed shape and filled with grease of size 00 or more but less than 5 months.

(4) Grease of size 0 or more and less than size 5 is applied to a thickness of 0.7 mm or less on the surface of the core that collides with or slides on the armature suction part.

By controlling the grease application m and the grease material and applying the grease to the necessary parts as described in ``D'', the basic property t1 of the impact dot head, which is the printing force and response ability of the wire drive, can be maintained without compromising the printing force and response ability of the wire drive. This has the effect of being able to provide an impact dot head with dramatically improved durability of 11 times at a low cost while avoiding the cost increase due to the use of special structures and materials.

[Brief explanation of drawings]

FIG. 1(a) is a sectional view showing a first embodiment of the present invention. FIGS. 1(b) and 1(c) are perspective views showing a first embodiment of the present invention. FIG. 1(d) is a sectional view of the same. Figures 2(a)(b), 3(a)(b) and 4(
FIGS. 3A and 3B are diagrams showing the relationship between grease preparation and printing power according to the present invention. FIGS. 5(a) to 5(f) are cross-sectional views showing other embodiments of the present invention. FIGS. 6(a) and (b) and FIGS. 7(a) and 7(b) are sectional views showing other embodiments of the present invention. FIGS. 8(a) and 8(b) are a sectional view and a perspective view showing another embodiment of the present invention. FIGS. 9(a) and 9(b) are a perspective view and a sectional view showing another embodiment of the present invention. 10, FIGS. 11(a) to 11(C), and FIGS. 12 to 14 are diagrams showing conventional examples of impact dot heads. 1... Lever 2... Return spring 3... Damper 4... Armature 5... Electromagnet 6... Lever fulcrum 7... Wire 8... Wire guide 9... Ink Ribbon 10...printed paper surface 11...fulcrum part 12...lever/return spring engaging part 13...armature/core both contact surfaces 14...core 15...sliding of wire guide and wire Part 16...Fully point presser spring 17...Spacer 18...Lever's fulcrum part receiver is surface 19...Return spring receiver is surface 20...Cap 21...Wire guide 22 at the tip...・Oil-impregnated felt 23...Lubricant 24...Wire guide part 30...Fulcrum shaft and above

Claims (4)

[Claims] (1) In an impact dot head that uses electromagnetic force to drive an armature, a wire attached to the tip of a lever that is integrated with the armature collides with the printing paper surface via an ink ribbon to perform printing. Apply 0.1 x 10^-^3cc or more of 10 x 10 grease of No. 1 or more but less than No. 5 to the sliding part of the lever fulcrum.
^-^ An impact dot head characterized by applying less than 3cc. (2) An impact dot head characterized in that the engagement portion between the return spring and the lever is coated with 1.0×10^-^3cc or less of grease of No. 0 or more but less than No. 4. (3) An impact dot head characterized in that the back side of the tip of the wire guide located at the tip is semi-sealed and filled with grease of No. 00 or more but less than No. 5. (4) An impact dot head characterized in that the core surface that collides with or slides on the armature suction part is coated with grease of No. 0 or more and less than No. 5 to a thickness of 0.7 mm or less.