JP3395521B2 - Printer - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, POS (P
Regarding a printer such as a receipt issuing machine and a journal printer used in the point-of-sale system,
In particular, it relates to a heat dissipation mechanism of a carriage motor for driving a printing mechanism and the like.

[0002]

2. Description of the Related Art Conventionally, as this type of printer, a printer that prints on recording paper by using, for example, a cassette-shaped ink ribbon has been known. A carriage motor for driving the mechanism section is provided.

Since the driving efficiency of this carriage motor is lowered due to its heat generation, this type of printer is generally provided with a heat radiating means for radiating heat generated by the motor.

FIG. 5 shows a heat dissipation means of a conventional carriage motor. As shown in FIG. 5, a carriage motor 31, which is, for example, a stepping motor, is attached to the back side of the base frame 30 arranged inside the apparatus body (not shown). This base frame 30
Is made of a resin such as ABS and has a low thermal conductivity. Therefore, a heat dissipation member 32 made of a metal such as aluminum is attached to the carriage motor 31 to dissipate heat generated in the carriage motor 31. .

[0005]

However, such a conventional technique has the following problems.

That is, since the conventional heat dissipation member 32 is made of metal such as aluminum by casting or mechanical processing such as milling, the manufacturing cost becomes high in terms of processing cost and accuracy control. was there.

Further, in the case of the conventional heat dissipation member 32, the heat dissipation portion is formed in a cylindrical shape in accordance with the shape of the carriage motor 31, and the inner surface thereof is brought into close contact with the carriage motor 31. It is difficult to completely bring the side surface 32a into close contact with the outer side surface 31a of the carriage motor 31, and the contact is actually made only at three points. Therefore, there is a problem that the heat dissipation efficiency is poor.

In this case, in order to improve the heat radiation efficiency, a method of injecting a silicone resin or the like having good thermal conductivity between the carriage motor 31 and the heat radiation member 32 has been devised, but in that case, at the time of assembling work. Since the resin flows out, the workability is deteriorated and the cost is increased.

Further, in the case of the conventional heat dissipation member 32, since it has a thick shape, there is a drawback that the volume and weight increase.

The present invention has been made in order to solve the problems of the prior art, and an object thereof is to provide a printer provided with a heat radiating means having a low processing cost and a high heat radiating efficiency.

Another object of the present invention is to provide a printer having a small and lightweight heat radiating means which is excellent in assembling.

[0012]

In order to achieve the above object, a printer of the present invention radiates heat generated by a motor, a mechanism for printing on a recording sheet, a motor for driving the mechanism. And a plurality of bent and raised portions that are pressed into contact with each other so as to surround the outer periphery of the motor.
It is characterized in that a protrusion for positioning is provided between the bent and bent portions.

Further, the printer of the present invention is a printer provided with a mechanism portion for printing on a recording sheet, a motor for driving the mechanism portion, and a heat radiating means for radiating heat generated by the motor. The heat dissipating means is made of a plate-like member, and the heat dissipating means is provided with a plurality of triangular bend-raising parts that are pressed against each other so as to surround the outer periphery of the motor, and positioning protrusions are provided between the bend-raising parts. It is characterized by being

In these cases, it is also effective to form the bent and raised portion in contact with the motor in a shape along the outer surface of the motor. Further, it is also effective to form the bent and raised portion in contact with the motor in an arc shape.

Further, it is also effective to provide the heat radiating means so that it can come into contact with another heat radiating means arranged in the printer body.

In the case of the present invention having such a structure, the heat radiating means is a plate-shaped member provided with a bent and raised portion,
Since the heat dissipating means can be formed by drawing and bending, it is not necessary to perform expensive machining such as casting or milling. Also, since it is a plate-shaped member,
The size and weight can be reduced.

Further, since a plurality of bending and raising portions are provided so as to surround the motor and press-contact with each other, there are many points where the heat radiation member and the motor come into contact with each other, and a high heat radiation effect can be obtained.

Moreover, since it is not necessary to use a silicone resin or the like for adhesion, the resin does not flow out at the time of work unlike the conventional one.

In this case, if the bending-raised portion which contacts the motor is formed in a shape along the outer surface of the motor, the bending-raised portion and the motor come into surface contact with each other, and the heat radiation efficiency is further improved.

Further, by forming the bent and raised portion in contact with the motor in an arc shape, it is possible to improve the heat radiation efficiency for a cylindrical motor, for example.

Further, by disposing the heat dissipating means in contact with another heat dissipating means arranged in the printer body,
Although the heat dissipation efficiency can be further improved, in the case of the present invention, since the contact area with the motor is larger than that of the conventional one, even if the position of the heat dissipation member is slightly moved, the heat dissipation effect in the heat dissipation member is almost impaired. I can't. Therefore, even if the dimensional accuracy of each member is somewhat poor, the heat dissipation member can be brought into close contact with another heat dissipation means.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

FIG. 4 shows a schematic overall configuration of the printer of this embodiment, showing a state where the main body cover is removed.

As shown in FIG. 4, the printer 1 comprises an upper case 2 and a lower case 3 as a main body of the apparatus, and a roll-shaped recording paper (hereinafter, referred to as "printing paper") in an accommodating portion 4 provided at a rear portion of the lower case 3. It is called "roll paper". Also,
The cassette-shaped ink ribbon 5 mounted on the front ribbon frame 6 of the lower case 3 is configured to perform printing on the roll paper S by a printing mechanism unit described later.

Further, in the front part of the lower case 3, there is provided a printer main body 13 including a paper feeding mechanism, a ribbon feeding mechanism and a detecting mechanism in addition to the above-mentioned printing mechanism.

Further, a feed switch 7 for feeding the paper, a control panel 8 for displaying an error message, and a power switch 9 are provided on the front surface of the apparatus main body, and the rear side of the ribbon frame 6 is provided. Has
A cutter 12 for cutting the recording paper S is provided.

1 to 3 show the essential parts of this embodiment. FIG. 2 shows the printer main body 13 as viewed from the back side. The printer body 13 is, for example, AB
A printing mechanism unit, a paper feeding mechanism unit, a ribbon feeding mechanism unit, and a detection mechanism unit are provided on a base frame 20 made of a resin such as S.

As shown in FIG. 2, a carriage motor 21 for driving the printing mechanism portion and the ribbon mechanism portion is attached to the lower portion of the base frame 20. As the carriage motor 21, for example, a cylindrical stepping motor is used. This carriage motor 21
A heat dissipation member 22 as a heat dissipation means as described below is attached to the.

FIG. 1 shows the heat dissipation member of this embodiment.

As shown in FIG. 1, the heat dissipation member 22 is
For example, it is composed of a plate-shaped member made of metal such as aluminum or copper having high thermal conductivity. The heat dissipation member 22 is composed of a flat plate-shaped base portion 23 and a plurality of triangular bent and bent portions 24.

The bent and raised portions 24 are formed by drawing a metal plate. In this embodiment, nine bent and raised portions 24 are provided. The thickness of the heat dissipation member 22 is about 2 mm, but the thicker the heat dissipation effect is, the better.

As shown in FIG. 1, the bent and raised portion 24 is
The carriage motor 21 having a cylindrical shape is arranged so as to draw a circle and is inserted into a portion surrounded by the bent and raised portions 24. In this case, each bending and raising part 24
The inner diameter of the circle formed by the bent portion is substantially the same as the outer diameter of the carriage motor 21. Then, each bent and bent portion 24 is formed so as to face slightly inward (about 1 °) with respect to the vertical direction with respect to the base portion 23. Therefore, when the carriage motor 21 is inserted into the portion surrounded by the bent and raised portions 24,
Due to the elasticity of the bent and raised portion 24, the carriage motor 21
The inner side surface of each bent and raised portion 24 is always in pressure contact with the outer side surface 21a.

Further, as described above, the bending and raising portion 2
Since 4 is formed by drawing, the inner side surface 24a of each bent and bent portion 24 has an arcuate surface that curves inward. Therefore, in the case of the present embodiment, the outer side surface 21a of the carriage motor 21 and the inner side surface 24a of each bent and bent portion 24 are in surface contact with each other. Then, the heat generated in the carriage motor 21 is efficiently transmitted to the heat radiating member 22 and is radiated from the heat radiating member 22 into the air.

As shown in FIGS. 1 and 2, a positioning projection 22b is provided between the bent and raised portions 24.

FIG. 3 shows the relationship with the heat dissipation plate 25 provided in the lower part of the apparatus body.

The heat radiation plate 25 is made of, for example, a mild steel plate and has a larger area than the heat radiation member 22. Then, as shown in FIG. 3, the heat radiating member 22 is fixed to the heat radiating plate 25 by screws 26 so that their surfaces are in close contact with each other. More specifically, even if there is a gap between the heat dissipating member 22 and the heat dissipating plate 25, the heat dissipating member 22 presses the outer side surface 21a of the carriage motor 21 at each bent and raised portion 24, so that the screw 26 is tightened. As the heat dissipating member 22 moves, the heat dissipating member 22 slides on the outer side surface 21a of the carriage motor 21 to come into close contact with each other. As a result, the heat generated in the carriage motor 21 passes through the heat dissipation member 22 and the heat dissipation plate 25
And is released from the heat dissipation plate 25 into the air.

In general, heat is transferred by radiation, convection, and conduction, but since the effect of conduction is the greatest,
This embodiment has a great effect.

As described above, according to this embodiment,
Since the heat dissipation member 22 can be obtained by drawing and bending a single metal plate, the cost can be reduced as compared with the conventional one by casting or the like.

Further, in the case of the present embodiment, the heat dissipation member 22
Since the inner side surfaces 24a of the plurality of bent and raised portions 24 and the outer side surface 21a of the carriage motor 21 are arranged in close contact with each other, the contact area becomes larger than that of the conventional one and the heat dissipation efficiency is improved. be able to. For example,
According to the present embodiment, when the surface temperature of the carriage motor 21 is 80 °, the temperature can be lowered by about 2 ° compared to the conventional example.

Further, according to the present embodiment, since it is not necessary to use a silicone resin for adhesion, the resin does not flow out as in the conventional example, and the workability in assembly can be improved.

In addition, in this embodiment, since the contact area with the carriage motor 21 is larger than that of the conventional one, even if the position of the heat radiating member 22 is moved a little, the heat radiating effect of the heat radiating member 22 is not increased. Almost not damaged. Therefore, even if the dimensional accuracy of each member is somewhat poor, the heat radiating member 22 can be brought into close contact with the heat radiating plate 25, and thus, the dimensional accuracy of each member constituting the printer is strong, and It is possible to obtain a printer with high heat radiation efficiency of the carriage motor 21.

The present invention is not limited to the above-mentioned embodiment, and various modifications can be made.

For example, the shape and number of bent and bent portions provided on the heat dissipation member may be arbitrary. However, it is preferable to provide at least three bent and raised portions so as to surround the carriage motor.

Although various materials can be used for the heat dissipation member, it is desirable to use a metal material having a high thermal conductivity. In particular, if aluminum is used as in the above-mentioned embodiment, processing is possible. It is most suitable from the viewpoints of durability, downsizing and rust.

Furthermore, the present invention can be applied not only to the above-mentioned carriage motor, but also to various motors and also to various printers.

[0046]

As described above, according to the present invention, the heat radiation means can be formed by drawing and bending, so that it is not necessary to perform machining such as casting or milling, and the cost can be reduced. You can Further, since the heat dissipation means is a plate-shaped member, it is possible to reduce the size and weight of the printer.

Further, by providing a plurality of bending and raising portions so as to surround the motor and press-contact them, the number of contact points between the heat radiating member and the motor can be increased and heat radiation efficiency can be improved.

Moreover, since it is not necessary to use a silicone resin or the like for adhesion, the resin does not flow out at the time of work unlike the conventional one, and as a result, the work efficiency in the assembling work can be improved.

In this case, by forming the bent and raised portion in contact with the motor in a shape along the outer surface of the motor, the bent and raised portion and the motor are brought into surface contact with each other, and the heat radiation efficiency can be further enhanced.

Further, by forming the bent and raised portion in contact with the motor in an arc shape, for example, the heat radiation efficiency for a cylindrical motor can be improved.

Further, by disposing the heat dissipating means in contact with other heat dissipating means arranged in the printer main body, the dimensional accuracy of each member constituting the printer is highly resistant to variations.
In addition, it is possible to obtain a printer with high heat dissipation efficiency of the motor.

[Brief description of drawings]

FIG. 1 is a perspective view showing a heat dissipation member in an embodiment of a printer according to the present invention.

FIG. 2 is a perspective view showing attachment of a heat dissipation member to a motor in the same embodiment.

FIG. 3 is a perspective view showing attachment of a heat dissipation member to a heat dissipation plate in the same embodiment.

FIG. 4 is a perspective view showing a schematic overall configuration of the printer of the embodiment with a main body cover removed.

FIG. 5 is a perspective view showing attachment of a conventional heat dissipation member to a carriage motor.

[Explanation of symbols]

1 printer 2 upper case 3 lower case 5 ribbon cassette 6 Ribbon frame 13 Printer body 20 base frame 21 Carriage motor 21a outer surface 22 Heat dissipation member 23 base 24 Bending and raising part 24a inner surface 25 heat sink

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41J 29/377 H02K 5/18

Claims (5)

(57) [Claims] 1. A printer comprising a mechanism section for printing on a recording sheet, a motor for driving the mechanism section, and a heat radiating means for radiating heat generated by the motor, the heat radiating means. Is formed of a plate-shaped member, and the heat dissipation means is provided with a plurality of bent and raised portions that are pressed against each other so as to surround the outer periphery of the motor, and a positioning projection is provided between the bent and raised portions. Characteristic printer. 2. A printer comprising a mechanism section for printing on a recording sheet, a motor for driving the mechanism section, and a heat dissipation means for dissipating heat generated by the motor, the heat dissipation means Is a plate-shaped member, and the heat dissipation means is provided with a plurality of triangular bend-raising portions that press-contact so as to surround the outer periphery of the motor, and positioning protrusions are provided between the bend-raising portions. A printer characterized by being installed. 3. The printer according to claim 1, wherein a portion of the bent and bent portion that comes into contact with the motor is formed in a shape along the outer surface of the motor. 4. A portion of the bent and raised portion that contacts the motor is formed in an arc shape.
The listed printer. 5. The printer according to claim 1, wherein the heat radiating means is provided so as to be in contact with another heat radiating means arranged in the printer body.