JP2570268Y2 - Printer with print head cover - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer equipped with a print head cover in which a print head such as a wire dot print head is provided with a danger prevention cover.

[0002]

2. Description of the Related Art Conventionally, there is a printer with a print head cover in which a print head having a cover for preventing danger is mounted on a carriage frame. FIG. 5 is a schematic external perspective view showing a conventional example including a break portion, and FIG. 6 is an external perspective view of a conventional print head with a head cover. Print head cover 1
A wire dot print head 2 (hereinafter, referred to as a print head 2) equipped with a cover 1 (hereinafter, referred to as a cover 1) is mounted on a carriage frame 3 and performs a spacing operation along an axis 4 in a direction of an arrow AB, and a platen 5 Is printed on a printing paper (not shown) behind. During the printing operation, the surface temperature of the print head 2 may rise up to about 80 ° C. due to heat generation. During operation of the printer, the upper cover 6 is closed, and the operator does not touch the print head 2.
However, immediately after printing, the upper cover 6 may be opened for replenishment of paper or the like, and the operator may directly touch the print head 2. If the print head 2 is hot, there is a danger of burns. Therefore, a rubber or plastic cover 1 having low thermal conductivity is attached to the print head 2 for personal protection.

As shown in FIG. 6 (A), the fixing of the cover is surely screwed, but it is not preferable in terms of assembly because it takes time to tighten the screw. Further, since the temperature of the screw 7 itself becomes high, it is necessary to keep the screw 7 from touching the hand. To fix the other cover, a hook 8 is provided on the cover 1 and the hook 8 is hooked on the print head 2 as shown in FIG. In this case, the cover 1 can be easily removed without using a tool or the like, so that a display that calls attention to the operator is required. The print head 2 with the cover 1 inserted has the connector 2a inserted into the carriage frame 3 and mounted on the print head mounting surface 3a.

[0004]

[Problems to be Solved by the Invention] In a conventional printer with a print head cover, when the cover is attached to the print head, (1) the fixing by screw tightening is reliable, but it takes time and labor to assemble and touches the screw. It is necessary to hide the screw so that it does not exist. (2) A cover provided with a hook facilitates the mounting, but has a problem that the safety is not perfect because the cover can be easily removed. SUMMARY OF THE INVENTION It is an object of the present invention to provide a printer with a print head cover which facilitates mounting of a cover on a print head, and which does not easily come off after being mounted on a carriage frame, and which is highly safe.

[0005]

In order to achieve the above object, a printer with a print head cover according to the present invention contacts the side wall before the hook portion comes off the print head, and contacts the print head cover with its own protrusion amount. A gap is formed between the side walls.

[0006]

According to the printer with the print head cover configured as described above, when the print head cover is mounted on the print head, the hook portion is bent by receiving a reaction force from the outer wall of the print head, and the print head cover is bent. In the inserted state, it is slid in the insertion direction and attached to the print head. Even if the print head cover is removed after the print head is mounted on the carriage frame, the print head cover comes into contact with the print head before the hook portion of the print head cover comes off the print head, so that the print head cover does not come off the print head. Further, by providing a gap between the print head cover and the side wall by the protrusion amount of the projection itself, the heat transmitted from the print head to the print head cover is easily radiated. Therefore, it is possible to prevent the operator from directly touching the print head that has reached the high temperature due to the continuous printing operation, and also to prevent the print head cover, which the operator may touch, from getting hot. It can provide a printer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals. FIG. 2 is a schematic external perspective view showing an embodiment including a break portion. Print head cover 11 (hereinafter head cover 11)
) Is mounted on the carriage frame 12 and performs a spacing operation along the axis 4 in the direction of arrow AB, with the platen 5 behind. Printing is performed on a printing paper (not shown).

FIG. 3 is a sectional view showing the structure of a wire dot print head. An armature 14 having one end to which a wire 13 is fixed is supported by a spring 15 and is placed in a magnetic path formed by an armature yoke 16, a permanent magnet 17, and a core yoke 18. Armature 1
4 is attracted to the attraction surface 18 a of the core yoke 18 by bending the spring 15 by the magnetic force of the permanent magnet 17. A coil 19 is wound around the core yoke 18, and terminals of the coil 19 are soldered to a connection board 21 via an insulating pad 20. Here, when the coil 19 is energized, the magnetic force of the permanent magnet 17 cancels the magnetic force generated by the coil, and the armature 14 is released from the attraction force of the core yoke 18 and swiftly by the force stored in the spring 15, Jump out in the direction of arrow D. Then, the tip of the wire 13 collides with the printing paper via the ink ribbon, and prints dots. During the printing operation, the surface temperature of the print head 2 rises up to about 80 ° C. due to heat generation.

FIG. 4 is an external perspective view showing a state where the head cover of the present invention is mounted on the print head. The head cover 11 is attached to the print head 2 with claws 25 and 26 provided to face the hook portions 23 and 24 having flexibility. The hooks 23 and 24 have projections 27 and
28 are provided. To attach the head cover 11 to the print head 2, the hooks 23 and 24 are pushed in along the side wall of the print head 2. The tips of the claws 25 and 26 are the print head 2
Of the hook portions 23 and 24
Moves along the side wall in a bent state. When reaching the side wall end, the claws 25 and 26 return due to the restoring force of the hook portions 23 and 24 and are hooked on the corners of the side wall.

FIG. 1 is an enlarged view as viewed from a direction C in FIG. The print head 2 on which the head cover 11 is mounted is mounted on the print head mounting surface 28 of the carriage frame 12. At this time, the connection board 21 on the side of the print head 2 is inserted into a connector (not shown) of the carriage frame 12, and a screw (not shown) is attached to the attachment hole 22a of the head frame 22 shown in FIG. I do. On the carriage frame 12, side walls 29 and 30 are provided upright with the print head 2 mounted on the print head mounting surface 28 interposed therebetween. At this time, the projections 2 on the side walls 29 and 30 and the head cover 11
7 and 28 are close to each other. Therefore, the head cover 11
Is mounted on the carriage frame 12 and then the head cover 11 is removed.
7 and 28 do not come off because they contact the side walls 29 and 30.

[0011]

[Effect of the Invention] The present invention is configured as described above, and has the following effects. After the print head with the print head cover is mounted on the carriage frame, the operator prevents the protrusions provided on the print head cover from coming off by contacting the side walls of the carriage frame even when trying to remove the print head cover. The risk of burns from accidentally touching the hot print head is eliminated. Also, the print head cover touched by the operator is provided with a gap around the print head cover, so that even if heat generated from the print head is transmitted to the print head cover, the heat is radiated to the surroundings and the print head cover does not become hot.

[Brief description of the drawings]

FIG. 1 is an enlarged view as viewed from a direction C in FIG. 2;

FIG. 2 is a schematic external perspective view showing an embodiment including a break portion.

FIG. 3 is a sectional view of a wire dot print head.

FIG. 4 is a perspective view of a print head with a head cover.

FIG. 5 is a schematic external perspective view showing a conventional example including a break portion.

FIG. 6 is a perspective view of a conventional print head with a head cover.

[Explanation of symbols]

 1,11 Print head cover 23,24 Hook part 25,26 Claw 27,28 Projection 29,30 Side wall

Claims (1)

(57) [Scope of request for utility model registration] 1. A mark which reaches a high temperature by a continuous printing operation.
Print head cover with flexible hooks
After fixing with the hook, the carriage frame
In a printer with a print head cover to be mounted , stand upright so that the print head is sandwiched between the hooks.
The side wall and the hook portion in the direction facing the side wall,
Before the hook part comes off the print head, it contacts the side wall.
Between the print head cover and the side wall.
Provided with a projection that forms a gap in accordance with the amount of projection.
And a printer with a print head cover.