JP2990812B2 - Impact dot head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to an impact dot head of an impact dot printer, and more particularly to an impact dot head of an impact dot printer characterized by a method of fixing positioning and fixing means between a radiating member and a nose frame.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a conventional impact dot head. A heat radiating member mounting reference surface 3 on the carriage 325 is attached to a part of the heat radiating member 304 in which the core block 301 is tightly fitted inside via the heat conductive resin material 315.
07 and a radiating member mounting portion 306 which is positioned and fixed in close contact with the nose frame 31 made of plastic.
6, an impact dot head of an impact dot printer having a positioning fixing portion for positioning with reference to the nose frame mounting portion 308 on the heat radiating member 304. Conventionally, when a positioning fixing portion which is a part of the nose frame 316 is attached to a certain nose frame attaching portion 308, the nose frame 316 is fixed to the radiating member 3 by a nose frame fixing screw 323.
04 and fixed.

[0003]

However, such a mounting method has a drawback that screwing requires screw hole processing, which leads to an increase in the cost of parts. In addition, the assembling process has a drawback that the process becomes complicated, which leads to an increase in assembly costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not use a screw for a fixing portion for positioning a heat radiating member and a nose frame. An object is to provide a dot head.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a part of a heat dissipating member is provided with a mounting part which is positioned and fixed in close contact with a mounting reference surface on a carriage, and a part of a nose frame is provided on a heat dissipating member. In an impact dot head of an impact dot printer having a positioning fixing portion for positioning with reference to a mounting portion of the nose frame, a positioning fixing portion, which is a part of the nose frame, is mounted by press fitting to a mounting portion of the radiating member with the nose frame. It is characterized by having such a configuration.

[0006]

In the impact dot head configured as described above, the positioning and fixing portion, which is a part of the nose frame, is mounted by press-fitting on the mounting portion of the radiating member to the nose frame. This leads to a reduction in the cost of assembly, and an inexpensive impact dot head can be obtained.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are a partial sectional view and a front view of an impact dot head showing an embodiment of the present invention. Reference numeral 1 denotes a core block. The core block 1 is formed in a cup shape, and a large number of cores 2 on which a coil bobbin 3 is mounted are circumferentially arranged on the inner bottom surface.
Reference numeral 4 denotes a heat dissipating member. Inside the heat dissipating member 4 having a bottomed cylindrical shape provided with a heat dissipating fin 5 on its surface, the above-described core block 1 together with the yoke plate 11, the armature 12, and the holding plate 13 is provided on its peripheral surface. They are closely fitted with each other via a heat conductive resin material 15 such as a silicone resin applied.

On the lower end surface of the heat dissipating member 4, a heat dissipating member attaching portion 6 which is closely mounted on the heat dissipating member attaching reference surface 7 on the carriage 25 is formed so as to protrude. The heat radiating member 4 is mounted on the heat radiating member mounting reference surface 7 which is the lower surface of the heat radiating member mounting portion 6.

On the other hand, the nose frame indicated by reference numeral 16 has a nose frame which is press-fitted into the nose frame mounting portion 8 of the heat radiating member 4 on both sides of the upper end of a nose frame back plate 17 which is attached to the opening end of the heat radiating member 4. A press-fit portion 18 is formed. Further, a nose frame press-fit portion projection 19 projects upward from the upper surface of the nose frame press-fit portion 18. When the nose frame press-fitting portion 18 is pressed into the nose frame mounting portion 8 of the heat radiating member 4, the nose frame press-fitting portion projection 19 is provided on the nose frame mounting portion 8 of the heat radiating member 4. 9, the lower surface of the nose frame press-fitting portion 18 is
The nose frame 16 is configured to be accurately and firmly attached to the heat radiating member 4 by being pressed to zero.

Reference numeral 21 in the drawing denotes a nose frame positioning dowel formed so as to fit with a nose frame positioning hole 22 provided in the nose frame positioning portion 20. The nose frame 16 is mounted on the nose frame positioning dowel 21. It is configured so that accurate positioning can be performed by fitting. In the drawing, reference numeral 14 denotes a printing wire, 24 denotes a heat-radiating member fixing screw for fixing the heat-radiating member 4 to the heat-radiating member mounting reference surface 7 on the carriage 25, and 26 denotes a guide shaft for traveling of the carriage 25.

In the impact dot head 100 thus configured, the yoke plate 11 and the armature 12
The core block 1, which has been integrated with the holding plate 13, is fitted into the heat radiating member 4 via the heat conductive resin material 15 applied on the peripheral surface, and a nose frame attached to the upper end of the heat radiating member 4 is projected forward. Nose frame 16 in part 8
The nose frame 1 is press-fitted into the nose frame press-fitting portions 18 provided on both upper ends of the rear plate 17 of the nose frame 1.
6 is connected to the opening end of the heat radiation member 4, in this embodiment,
The distance from the radiating member mounting reference surface 7 to the nose frame mounting reference surface 10 of the radiating member 4 and the distance from the nose frame mounting reference surface 10 of the nose frame 16 to the center line 50 of the impact dot head 100 are determined with high accuracy. Of the impact dot head 100
Direction positioning can be performed accurately. Further, the nose frame 16 is fitted to the nose frame positioning dowel 21, and the heat radiating member 4 is fixed on the heat radiating member mounting reference surface 7 on the carriage 25 with the heat radiating member fixing screw 24, so that the impact dot head 100 in the X direction is Positioning can be performed accurately.

In this embodiment, in particular, the heat radiating member 4
A ring-shaped heat conductive resin material reservoir 27 is formed at the opening edge of the opening, and when the core block 1 is fitted from the opening end side, the heat conductive resin material 15 protruding from this portion is accommodated. Therefore, the parallelism between the heat radiating member 4 and the core block 1 can be easily obtained.

[0014]

As described above, according to the present invention, the positioning and fixing portion, which is a part of the nose frame, is mounted by press-fitting on the mounting portion of the radiating member to the nose frame. The cost can be reduced, and an inexpensive impact dot head can be obtained. Also, a mounting portion is formed at the lower end of the heat dissipating member, which is closely positioned and fixed on a mounting reference surface with the carriage, and a positioning fixing portion for positioning with respect to the mounting portion on the heat dissipating member is formed on the nose frame. Therefore, the entire impact dot head can be accurately positioned and fixed.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an impact dot head showing an embodiment of the present invention.

FIG. 2 is a front view of the impact dot head according to the embodiment of the present invention.

FIG. 3 is a side view of an impact dot head showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 301 Core block 2 Core 3 Coil bobbin 4, 304 Heat radiating member 5 Heat radiating fin 6, 306 Heat radiating member mounting part 7, 307 Heat radiating member mounting reference plane 8, 308 Nose frame mounting part 9 Nose frame mounting part protrusion 10 Nose frame mounting Reference surface 11 Yoke plate 12 Armature 13 Press plate 14 Print wire 16, 316 Nose frame 17 Nose frame back plate 18 Nose frame press-fit portion 19 Nose frame press-fit portion projection 20 Nose frame positioning portion 21 Nose frame positioning dowel 22 Nose frame positioning hole 23 , 323 Nose frame fixing screw 24 Heat radiating member fixing screw 25, 325 Carriage 26 Carriage running guide shaft 27 Heat conductive resin material reservoir 50 Center line of impact dot head

Claims (1)

(57) [Claims] 1. A part of a heat dissipating member, in which a core block is tightly fitted inside through a heat conductive resin material, is formed with a mounting portion that is positioned and fixed in close contact with a mounting reference surface on a carriage. In an impact dot head of an impact dot printer having a positioning fixing portion for positioning with reference to the mounting portion on the heat radiating member, a part of the nose frame made of An impact dot head characterized in that a positioning fixing portion, which is a part of the nose frame, is attached by press-fitting.