JPH08295036A - Printing head for wire impact dot printer - Google Patents

Abstract

PURPOSE: To provide a printing head for a wire impact type dot printer effectively transferring the heat of a core block to a carriage by a radiation member easy to produce. CONSTITUTION: The attaching reference surface 5 parallel to a printing surface and developed in positional accuracy in a horizontal direction and a height reference surface 6 developed in positional accuracy in a height direction are provided to a carriage 1 and the rear surface 26 of the protruding part being the reference surface in the height direction of a nose frame 19 is brought into close contact with the height reference surface 6 while the radiation member attaching surface 23 being the reference surface in the horizontal direction and the attaching reference surface of the carriage 1 are brought into close contact with the carriage attaching surface 17 of a radiation member 11. Since the positioning in the height direction of the nose frame 19 is not performed by the radiation member 11, it is unnecessary to precisely process the radiation member 11 and production becomes easy. Since the clearance between a core block 8 and the inner peripheral surface of the radiation member 11 can be reduced, heat conductivity is enhanced and the heat to the carriage 1 is sufficiently let escape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print head for a wire impact type dot printer, and more particularly to a print head for a wire impact type dot printer characterized by a heat radiating means and a positioning and fixing means for fixing other members. .

[0002]

2. Description of the Related Art Generally, a print head for a wire impact type dot printer has a structure in which heat generated in a coil is radiated to the atmosphere by a heat radiating member with a fin fitted around the core block.

However, with such a structure, when high-density characters or the like are printed at high speed and continuously, the amount of heat generated from the coil exceeds the amount of heat radiated from the heat dissipation member, and the printing operation is performed. Since there is a disadvantage that it cannot be continued, in Japanese Patent Laid-Open No. 3-281257, as shown in FIG. 4, the print head 103 is configured so that the heat generated by the coil 100 is released to the carriage 101 and the guide shaft 102. I am making a proposal about.

That is, the print head 1 proposed here is used.
Reference numeral 03 denotes a horizontal mounting reference surface 1 formed on the carriage 101 for the carriage mounting surface 105 of the heat dissipation member 104.
07, the nose frame 108 has a height reference portion 109 in which the carriage mounting surface 1 of the heat dissipation member 104 is fixed.
05, and is fixed to the nose frame mounting surface 112 of the heat radiating member 104 to secure the positional accuracy in the height direction.
The heat dissipation to the heat dissipation member is improved and the printing position accuracy is ensured by the heat conduction to the heat dissipation member 104. In such a structure, from the carriage mounting surface 105 of the heat dissipation member 104 to the inner peripheral surface 111 joined to the core block 110. Of the nose frame 108 from the height reference portion 109 of the nose frame 108 to the core block 110 due to the positional deviation in the height direction, the core block 110 and the inner peripheral surface 111 are not gazed. The diameter of the inner peripheral surface 111 has to be set large so as not to occur. Therefore, there is a problem that the clearance between the inner peripheral surface 111 and the core block 110 is large, and the heat cannot be sufficiently transferred even if the heat conductive resin material is filled. Further, in order to prevent the nose frame 108 from inclining with respect to the printing surface, it is necessary to accurately set the perpendicularity between the carriage mounting surface 105 of the heat dissipation member 104 and the nose frame mounting surface 112, and the two surfaces of the heat dissipation member 104. However, there is a problem that it is not easy to manufacture.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to:
Another object of the present invention is to provide a new print head for a wire impact type dot printer that can effectively dissipate the heat of the core block to the carriage by a heat dissipation member that is easy to manufacture.

[0006]

In order to solve the above problems, according to the present invention, a printing surface formed on a carriage on a part of a heat radiating member having a core block fitted therein according to claim 1 of the present invention. A wire impact type dot printer characterized in that it forms a mounting surface for positioning and fixing in the horizontal direction in close contact with a mounting reference surface parallel to A print head, the wire impact dot printer according to claim 1, wherein the heat dissipating member comprises two bodies, and the core block is sandwiched between the two heat dissipating members to be closely attached. A print head for an impact dot printer is provided.

[0007]

With the print head for a wire impact type dot printer according to claim 1, positioning in the height direction is performed by the nose frame and the carriage, and no positioning means in the height direction is required between the heat dissipation member and the nose frame. The core block does not have a joint portion that regulates it when it is inserted into the inner peripheral surface of the heat dissipation member. Therefore, the clearance between the core block and the inner peripheral surface of the heat dissipation member can be reduced, and heat can be efficiently conducted from the core block to the heat dissipation member. Furthermore, since the mounting surface of the heat dissipating member and the mounting reference surface of the carriage are in close contact with each other, it is possible to efficiently dissipate heat from the heat dissipating member to the carriage. .

Further, since the heat dissipating member does not need the two surfaces which require the right angle, the manufacturing becomes easy.

With the print head for the wire impact type dot printer according to claim 2, since the core block is sandwiched between the two heat dissipating members and closely adhered to each other, the clearance becomes 0, and the heat from the core block to the heat dissipating member is reduced. Conduction can be performed very efficiently.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. In FIGS. 1 and 2, reference numeral 1 is a carriage on which a print head 2 is mounted, and a print surface 4 is provided along a carriage shaft 3.
It is made of a metal material that moves laterally with respect to and has good heat conduction, and has a positional accuracy in the horizontal direction with respect to the printing surface 4.
A mounting reference surface 5 parallel to the printing surface 4 is provided, and a recess 7 is provided on the mounting reference surface 5 having a height reference surface 6 that has positional accuracy in the height direction with respect to the printing surface 4. Code 8
Is a core block forming a heat source, and this core block 8 is formed in a cup shape, and its inner bottom surface is
A large number of cores 10 on which the coil bobbins 9 are mounted are arranged in a circular shape. 11 is a heat dissipation member that forms a heat sink,
The surface is provided with radiating fins, and the inner peripheral surface 16 has the yoke 12, the print lever 13, and the holding plate 14, and the core block 8 described above has a heat conductive resin material 15 such as a silicone resin applied on its peripheral surface. It is fitted tightly through. On the side surface of the heat dissipation member 11, a carriage mounting surface 17 that is closely fixed to the mounting reference surface 5 of the carriage 1 with a fixing screw 18 is formed.

The hole 27 through which the fixing screw 18 penetrates is
There is looseness in the fixing screw 18 so that the height direction is not restricted. Also, the carriage mounting surface 17
So that the surfaces of the mounting reference surface 5 and the mounting reference surface 5 are in close contact with each other.
Each surface is precision cut. By carrying out this cutting process, the heat transfer coefficient is improved by 10 to 20 times as compared with the surface state as it is as die-cast.

The nose frame indicated by the reference numeral 19 holds the wire guide 21 joined to the wire guide joining surface 20 and the print wire 22 is slidably held on the wire guide 21. It is defined by the mounting position of the nose frame 19. The nose frame 19 is formed with a heat radiating member mounting surface 23 that is closely fixed to the carriage mounting surface 17 of the heat radiating member 11, and each horizontal dimension of the nose frame 19 has positional accuracy with the heat radiating member mounting surface 23 as a reference. . Further, a convex portion 24 which is fitted into the concave portion 7 of the carriage 1 is formed, and the convex portion 24 is further formed.
The protrusion 25 is projected on the upper surface of the carriage 1, and is deformed when the convex portion 24 of the nose frame 19 is inserted into the concave portion 7 of the carriage 1, and the convex lower surface 26 of the convex portion 24 is brought into close contact with the height reference surface 6. There is. In addition, each dimension in the height direction of the nose frame 19 including the wire guide joint surface 20 has positional accuracy based on the lower surface 26 of the convex portion.

In the print head 2 constructed as described above, the print position of the print wire 22 with respect to the print surface 4 is on the height reference surface 6 of the carriage 1 which has positional accuracy in the height direction with respect to the print surface 4. The wire guide 2 that holds the print wire 22 by sticking the lower surface of the convex portion of the nose frame 19 to 26
Since the wire guide joint surface 20, which is the first joint surface, has positional accuracy with respect to the lower surface 26 of the convex portion, it can be accurately set.

The printing wire 22 for the printing surface 4
The horizontal mounting position of the carriage is the same as the mounting reference surface 5 of the carriage, which has positional accuracy in the horizontal direction with respect to the printing surface 4, and the heat dissipation member mounting surface 23, which serves as the horizontal dimension reference surface of the nose frame 19. Since it is in close contact with the carriage mounting surface 17 of the heat dissipation member 11, it can be set accurately.

Further, since the carriage mounting surface 17 of the heat dissipating member 11 and the carriage mounting reference surface 5 are in close contact with each other, heat can be efficiently conducted from the heat dissipating member 11 to the carriage 1. Further, since the heat dissipation member 11 and the core block 8 have no engaging portion in the height direction other than the engagement between the core block 8 and the inner peripheral surface 16, the diameter of the inner peripheral surface 16 is smaller than that of the core block 8. It can be inserted by making it slightly larger, and the clearance can be reduced to 1/3 compared to the conventional print head, and the thermal conductivity is 3
It can be improved by 0% or more.

In the embodiment shown in FIG. 3, the heat dissipating member is composed of two heat dissipating members 50 and 51. The core block 52 is sandwiched between the inner peripheral surfaces 53 and 54, and the core block 52 is brought into close contact with the fixing screw 55. The other structure is similar to that of the embodiment shown in FIGS.

In the print head thus constructed, the inner peripheral surfaces 53 and 54 are firmly adhered to the core block 52, and the clearance becomes 0, so that the heat is transferred from the core block to the heat radiating members 50 and 51. The thermal property is significantly improved, and the thermal conductivity can be improved by 50% or more as compared with the conventional print head.

[0018]

As described above, according to the present invention, it is possible to obtain the print head of the wire impact type dot printer in which the heat of the core block can be effectively released to the carriage by the heat dissipation member which is easily manufactured. it can.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a part of an embodiment of the present invention.

FIG. 2 is a perspective view showing the mounting of the embodiment of FIG. 1 of the present invention.

FIG. 3 is a perspective view showing another embodiment of the present invention.

FIG. 4 is a side view showing a part of a conventional example in section.

[Explanation of symbols]

 1 Carriage 2 Print Head 5 Mounting Reference Surface 6 Height Reference Surface 8, 52 Core Block 11, 50, 51 Heat Dissipating Member 16, 53, 54 Inner Surface 17 Carriage Mounting Surface 19 Nose Frame 23 Heat Dissipating Member Mounting Surface 26 Recessed Bottom Surface

Claims (2)

[Claims] 1. A mounting surface for positioning and fixing in a horizontal direction in close contact with a mounting reference surface parallel to a printing surface, which is formed on a carriage, is provided in a part of a heat dissipation member having a core block fitted therein. A print head for a wire impact type dot printer, characterized in that a carriage and a positioning means in a height direction are provided on a nose frame while being formed. 2. The wire impact type dot printer according to claim 1, wherein the heat radiation member is composed of two bodies, and the core block is sandwiched and closely adhered by the two heat radiation members. Print head.