JPH0743117U - Print head - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a structure of a print head of a wire dot printer, and an object thereof is to provide a printer head having a simple structure capable of improving the heat efficiency. The printhead includes a plurality of electromagnet mechanisms 22 fixed to a frame 29, an armature 27 arranged corresponding to each electromagnet mechanism 22, and each armature 27.
And a plurality of wires 32 driven by.
The print head includes a housing 21 for mounting the print head on a carrier and a coil 26 of each electromagnet mechanism 22.
It has a substantially cylindrical heat transfer member 23 made of a material having good heat conduction, which is disposed in the vicinity of the inner side of the heat transfer member, and a coupling mechanism for integrally assembling the electromagnet mechanism 22, the armature 27, and the heat transfer member 23. . One end of the heat transfer member 23 is the housing 21.
Is provided with a flange portion 31 that contacts with the electromagnet mechanism, a boss portion 30 that is close to the electromagnet mechanism, and a bottom wall 35 to which a screw 34 of the coupling mechanism is screwed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a print head of a wire dot printer.

A print head of a wire dot printer includes a plurality of wires that are each driven by an electromagnet mechanism. By operating an electromagnet mechanism corresponding to a predetermined wire, the wires are projected toward a printing surface. It is designed to print.

[0003]

[Prior art]

 A conventional printhead of this type is shown in FIG. In the figure, 1 is a mounting member, 2 is a print head, and 3 is a carrier. The mounting member 1 is fixed to the carrier 3, and is guided by the guide bars 4 and 5 and moves together with the carrier 3 which is driven in the direction perpendicular to the plane of the drawing. The print head 2 includes a plurality of electromagnet mechanisms 6. Each electromagnet mechanism 6 includes an iron core 7, a coil 8 wound around the iron core 7 and an armature 9, and is provided in a predetermined arrangement in the circumferential direction. The iron core 7 of each electromagnet mechanism is fixed to a common yoke 10, and the yoke 10 is fixed to a frame 11 connected to the mounting member 1. One end of a printing wire 12 is connected to the armature 9 of each electromagnet mechanism.

When the coil 8 of each electromagnet mechanism is not energized, the armature 9 of each electromagnet mechanism is energized by the spring 13 and is locked by the stopper 15 attached to the cover 14 of the frame 11 as shown in the figure. It is located in.

During printing, the coil 8 of each electromagnet mechanism is selectively energized. As a result, the armature 9 of the electromagnet mechanism energized by the coil is attracted to the opposing iron core 7 against the biasing force of the spring 13, and the wire 12 whose one end is connected to the armature 9 is attached to the mounting member 1. Printing is performed by projecting from the end face 16.

[0006]

[Problems to be solved by the device]

 In the conventional print head having such a structure and operation, the heat generated in the coil 8 by the energization is transferred to the frame 11 via the iron core 7 and the yoke 10, and this heat is transferred to the carrier 3 via the mounting member 1. Is transmitted to and is dissipated. That is, since the heat generated in the coil 8 is transferred through the iron core 7 and the yoke 10, it is not efficient, and the heat radiation effect is reduced by that much.

An object of the present invention is to provide a simple print head having a structure capable of improving heat dissipation efficiency.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, a plurality of electromagnet mechanisms, a frame to which each electromagnet mechanism is fixed, an armature arranged corresponding to each electromagnet mechanism, and driven by each armature. And a plurality of wires, which selectively actuate the coil of each electromagnet mechanism to actuate the armature corresponding to the coil and cause the wire corresponding to the armature to project. In a wire dot print head that performs printing by means of a print head, the print head includes a housing for mounting the head on a carrier, and a substantially cylindrical material made of a material having good heat conduction and arranged close to the inside of each electromagnet mechanism. A heat transfer member, and an electromagnet mechanism, an armature, and a coupling mechanism that integrally assembles the heat transfer member. The flange portion contacts the housing at one end, the boss portion is close to the electromagnet mechanism, and the bottom wall is screwed with the tip of the screw of the coupling mechanism. The configuration is characterized by.

[0009]

[Action]

 The heat generated in the coil of the electromagnet mechanism is efficiently transmitted to and dissipated from the heat transfer member disposed in the vicinity of the coil, and the heat of the case is also dissipated to the carrier. Therefore, the coil temperature can be effectively lowered. Further, since the heat transfer member that transfers the heat generated by the electromagnet mechanism to the carrier via the housing also serves as the member with which the screw of the coupling mechanism is screwed, the structure is simplified.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a side view of a print head according to the present invention, in which 21 is a housing (mounting member), 22 is an electromagnet mechanism, 23 is a heat transfer member, and 24 is a rubber cover.

The casing 21 is formed of a material having good heat conduction such as an aluminum alloy, is attached to a carrier (not shown), and can move together with the carrier.

The electromagnet mechanism 22 includes an iron core 25, a coil 26 wound around the iron core 25, and an armature 27, and a plurality of them are provided in a predetermined arrangement in the circumferential direction. The iron core 25 of each electromagnetic stone mechanism is fixed to a common yoke 28, and the yoke 28 is fixed to a frame (mounting member) 29 while swingably supporting each armature 27.

The heat transfer member 23 is a boss-shaped member made of a material having good heat conductivity such as aluminum or copper, and the boss portion 30 is arranged so as to be close to the inside of the coil 26 of each electromagnet mechanism. The flange portion 31 is fixed in direct contact with the housing 21. The above-mentioned electromagnet mechanism 22 is held and attached to the heat transfer member 23, and the attachment procedure is as follows.

When mounting the electromagnet mechanism, first, the yoke 28 and the frame 29 are fitted to the outer periphery of the boss portion 30 of the heat transfer member 23. In this case, one end is connected to the armature 27 of each electromagnet mechanism. The printed printing wire 32 is guided and supported by the housing 21 or the like. Then, in this state, when the screw 34 that is inserted into the pressing plate 33 is screwed into the bottom wall 35 of the boss portion 30 of the heat transfer member and tightened, the yoke 28 causes the pressing plate 33 to elastic member 36 ,. The frame 29 is pressed through the amateur recovery rubber 37 and the armature 27, and the frame 29 is fitted and pressed against the back side of the flange portion 31 of the heat transfer member to complete the installation of the electromagnet mechanism as shown in the figure.

In this case, the yoke 28 is accurately positioned in the circumferential direction by the engagement with the positioning pin 38 fixed to the heat transfer member 23, and the end portion of the armature 27 on the wire connecting side is pressed by the pressing plate 33. It is locked to an adjacent stopper 40 via a rubber plate 39 as shown in the drawing, and is separated from the iron core 25.

The rubber cover 24 is detachably fitted to the frame 29 to cover the electromagnet mechanism 22. 41 is an insulating plate such as rubber.

When printing is performed by this print head, the coils 26 of each electromagnet mechanism are selectively energized as in the conventional case. As a result, the armature 27 facing the energized coil 26 swings against the biasing force of the recovery rubber 37 and is attracted to the facing iron core 25, and the wire 32 having one end connected to the armature 27. Printing is performed.

Although the coil 26 generates heat during this printing, in the present invention, a heat transfer member 23 having good heat conduction is provided in the vicinity of the inside of the coil 26, and the heat transfer member 23 contacts the housing 21. Since it is fixed, the heat generated in the coil 26 is efficiently transmitted from the heat transfer member 23 to the housing 21 and the carrier and dissipated. When the silicone rubber 42 is filled between each electromagnet mechanism 22, the frame 29, and the heat transfer member 23 as in this example, the heat generated in the coil 26 is better transferred to the heat transfer member 23. The cooling effect is further improved.

[0020]

[Effect of device]

 As described above, according to the present invention, the heat generated by the coil of the electromagnet mechanism is efficiently transmitted to and dissipated from the heat transfer member disposed in the vicinity of the coil, and the heat of the case is transferred to the carrier. As it is dispersed and released, it is possible to effectively lower the coil temperature. Further, the heat transfer member that transfers the heat generated by the electromagnet mechanism to the carrier via the housing also serves as the member with which the screw of the coupling mechanism is screwed, so that the structure is simplified.

[Brief description of drawings]

FIG. 1 is a side view of a printhead of the present invention.

FIG. 2 is a side view showing an outline of a conventional print head.

[Explanation of symbols]

 21 housing 22 electromagnet mechanism 23 heat transfer member 25 enthusiast 26 coil 27 armature 29 frame 30 boss portion 31 flange portion 32 wire 34 screw 35 bottom wall

Claims (1)

[Scope of utility model registration request] 1. A plurality of electromagnet mechanisms, a frame to which each electromagnet mechanism is fixed, an armature arranged corresponding to each electromagnet mechanism, and a plurality of wires driven by each armature. A wire dot print head for printing by selectively energizing a coil of each electromagnet mechanism to activate an armature corresponding to the coil and projecting a wire corresponding to the armature. The print head includes a housing for mounting the print head on a carrier, and a substantially cylindrical heat transfer member made of a material having good heat conduction and arranged in proximity to the inside of the coil of each electromagnet mechanism. And a coupling mechanism for integrally assembling the electromagnet mechanism, the armature 9 and the heat transfer member, wherein the heat transfer member includes a flange portion, a boss portion and a bottom. More becomes, the flange portion is in contact with the casing at one end, said boss portion is close to the electromagnet mechanism, said bottom wall is the printhead, characterized in that the tip of the screw of the coupling mechanism is screwed.