JPH0635180B2 - Print head for serial printer - Google Patents

Description

The present invention relates to a print head for a serial printer.

(Prior Art) In a conventional print head for a serial printer, a metal radiating fin having good thermal conductivity is provided in order to prevent a temperature rise during printing, and when the print head moves, wind blows on it. The print head is cooled down.

(Problems to be Solved) According to the above-described conventional technique, the speed of the wind hitting the heat radiation fins depends on the moving speed of the head, and it is impossible to apply the high speed wind. Also, when using the print head in Europe, it is dangerous to touch the heat radiation fins with high temperature by hand, so it is necessary to cover them with rubber, etc., so that the heat radiation fins cannot radiate heat effectively and the print head can be cooled effectively. There wasn't.

(Object of the Invention) An object of the present invention is to cool a print head more efficiently.

(Means for Solving the Problems) In order to achieve the above object, a print head for a serial printer according to the present invention includes a head body that reciprocates, a radiation fin provided on the back surface of the head body, and a back surface of the radiation fin. And an air collecting blade provided in the. The radiating fin has a plurality of rearwardly projecting ribs extending parallel to the moving direction of the head body, and the air collecting blade is located behind the radiating fin and has a substantially V-shaped cross section. It is composed of a recessed rear wall portion and a horizontal wall portion projecting from the upper and lower edges of the rear wall portion toward the radiating fin side, and both ends thereof are openings for air intake and exhaust.

(Function) The air flow path between the rear wall of the air collecting blade and the heat radiation fin is narrowed toward the center of the heat radiation fin.
When the print head moves, the wind that is taken in from the opening of the air collecting blade and that crosses the heat radiation fins increases in speed toward the center of the heat radiation fins, and flows parallel to the ribs, so the wind hits the entire rib surface and the heat radiation fins It can dissipate heat effectively.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a flexible cable 2 for connecting a print head for a serial printer to a control circuit (not shown) is provided on the back surface of the head body 1 and a drive coil (not shown). Ends 3 of are connected. A radiating fin 4 for cooling the print head at the time of printing is provided on the rear portion of the head body 1. The radiating fin 4 has a plurality of ribs 4a protruding rearward and extending parallel to the moving direction of the head. Further, an air collecting blade 7 including a horizontal wall portion 6 and a back wall portion 5 is provided on the back surface of the heat radiation fin 4.

That is, as shown in FIG. 2, a plate-shaped back wall portion 5 having a cross-sectional shape in which the central portion is recessed in a V shape on the heat radiation fin 4 side is provided on the back surface of the heat radiation fin 4.

As shown in FIG. 1, the radiating fins 4 are provided on the upper and lower edges of the rear wall portion 5.
Horizontal walls 6 and 6 projecting to the side are provided, and as shown in FIG. 2, both ends A'and B'of the air collecting blade 7 in the head moving direction are openings for taking in air. .

Next, the operation will be described. As shown in FIG. 2, the print head is placed on a carrier (not shown), moves in the direction of the arrow to advance the print element (not shown), and dots are formed on the print medium (not shown) facing the print head. At this time, the print head generates heat, but when the print head moves in the A direction, the wind enters from the end A ′ of the air collecting blade 7 in the B direction, flows in parallel to the rib 4a, and hits the heat radiation fins 4. The rear wall portion 5 extends toward the center of the fin 4.
Since the flow path is narrowed by the one wall 5a, the wind increases the speed, efficiently cools the print head, and exits the directional print head from the end B '. When the print head moves in the B direction, contrary to the above, as the wind enters from the end B'to the A direction and reaches the central part of the heat dissipation fin 4, the wind speed is increased by the one wall 5b of the back wall part 5. The print head is cooled, and the print head is cooled from the end A ′ to the outside of the print head.

The cross-sectional shape of the back wall portion is not limited to this embodiment, and it is sufficient that the cross-sectional shape is substantially V-shaped.

Further, the extending portion 6a may be integrally provided on the upper portion of the back wall portion 5 as shown in FIG. 3 so as to also serve as a cover for the radiation fin.

(Effect) As described above, according to the present invention, the air flow path between the rear wall portion of the air collecting blade and the radiation fin is narrowed toward the central portion of the radiation fin, and when the print head moves. The wind that is taken in through the openings of the air collecting blades and that crosses the radiation fins increases in speed as it reaches the center of the radiation fins and flows parallel to the ribs, so the wind hits the entire rib surface and radiates heat effectively from the radiation fins. It is possible,
As a result, the print head can be cooled efficiently, and a decrease in the print performance of the print head can be prevented. Further, since the air collecting blade has a linear structure composed of a rear wall portion having a recessed cross-sectional shape and horizontal wall portions protruding from the upper and lower edges of the rear wall portion, the manufacturing is easy and the cost can be reduced, It can be easily attached to the head body.

[Brief description of drawings]

The drawings show an embodiment of a print head for a serial printer according to the present invention. FIG. 1 is a partial sectional side view, FIG. 2 is a partial sectional plan view, and FIG. 3 is a partial sectional view of another embodiment. It is a side view. 1 ... Head body, 4 ... Radiating fin, 4a ... Rib, 6 ... Horizontal wall part, 5 ... Rear wall part, 7 ... Air collecting blade.

Claims (1)

[Claims] 1. A head body which reciprocates, a heat radiation fin provided on a back surface of the head body, and an air collecting blade provided on a back surface of the heat radiation fin, wherein the heat radiation fin is the head. The air collecting blade has a plurality of rearwardly projecting ribs extending parallel to the moving direction of the main body, and the air collecting blade is located behind the heat radiating fin and has a substantially V-shaped cross section. The cereal is characterized by comprising a back wall portion and horizontal wall portions projecting from the upper and lower edges of the back wall portion toward the radiating fins, and both ends of which are openings for air intake and exhaust. Print head for printer.