JPH08132711A - Printing device - Google Patents

Abstract

PURPOSE: To constitute a mechanism of a dot head unit in a small size and lightweight at low cost with a good operability to improve a radiation effect of a dot head, in a printing device performing printing while carrying in both directions an impact type dot head mounted on a carrier supported slidably by a guide shaft. CONSTITUTION: A carrier 1 is constituted of a bearing formed of a metal which is rich in thermal conductivity and an elastic member 7 which allows one end to be abutted against the bearing 3 and is rich in the thermal conductivity, the elastic member 7 is abutted elastically against a dot head or a radiator fitted in the dot head 2 and a heat transfer route extending to the bearing 3 from the dot head 2 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus for bidirectionally moving an impact type dot head mounted on a carrier slidably supported by a guide shaft.

[0002]

2. Description of the Related Art In a conventional printing apparatus, the input energy to the dot head 2 is increased by high-speed and high-density printing, and the heat dissipation effect is reduced due to the downsizing of the dot head 2 accompanying the downsizing of the printing apparatus. In order to suppress an increase in the amount of heat generated by the dot head 2 and improve the heat radiation effect, the technique represented by FIGS. 9 and 10 has been used. This will be described below with reference to FIGS. 9 and 10.

The dot head 2 is fitted in the radiator 6, the dot head 2 is positioned by the guide pin portion 1a of the carrier 1 made of resin, and the radiator 6 has its base end portion fixed to the fixing screw 8. It is fixed so as to be in close contact with the bearing 3 having a high thermal conductivity fixed to the carrier 1.

With this mechanical structure, a heat transfer path connecting the dot head 2 to the radiator 6 and the bearing 3 is formed, and further to the frame body via the guide shaft 9 slidably fitted in the bearing 3. It enables heat transfer and achieves improved heat dissipation effect.

[0005]

However, the above-mentioned conventional example has the following problems. First, since the base end portion of the radiator 6 fitted with the dot head 2 is fixed so as to be in close contact with the bearing 3 fixed to the carrier 1, the radiator 6 is necessary and at the same time the radiator 6 is Strength and size / shape accuracy are required to fix and support the.

Generally, the radiator 6 is formed of an aluminum material having a high thermal conductivity, and in order to suppress the high cost of the material and the subsequent processing, a plate and a drawing material are used to eliminate the post processing. Although the processing cost is reduced, according to the configuration of the conventional example, post processing is required at the base end portion of the radiator 6 to secure dimensional / shape accuracy, and the dot head 2 is attached to the carrier 1. When the bearing 3 is set directly below the head nose portion 2a as shown in FIG. 1, which is one embodiment of the present invention, in order to suppress the height when mounted on In order to increase the shape of the radiator 6,
In order to ensure the strength and the accuracy of the size and shape, it is necessary to form the radiator 6 by casting and then perform post-processing, resulting in higher cost.

Next, the dot head 2 fitted in the radiator 6
When the heat sink 6 is detachable, the heat sink 6 is fixed to the carrier 1 by the fixing screw 8, and the fixing portions 6a are set on both sides of the dot head 2, so that the heat sink 6 and the carrier 1 are fixed.
Of the fixed portion 6a is larger than the width of the dot head.

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide a printing apparatus which has an improved heat dissipation effect, is small in size and lightweight, and is easy to operate and inexpensive. is there.

[0009]

As a means for solving the above-mentioned problems, a printing apparatus of the present invention comprises a bearing formed of metal or sintered metal, mounted on a carrier and sliding on a guide shaft, It is characterized in that it has a heat transfer member that is in contact with both the dot head or the radiator of the dot head and the bearing and that is formed of a metal plate and has elasticity.

Further, the heat transfer member has a holding means for the dot head.

[0011]

According to the above construction of the present invention, the heat generated from the dot head forms a heat transfer path through the heat transfer member to the bearing and further to the guide shaft, so that the heat dissipation effect is improved.

The dot head is fixed only by the heat transfer member.

[0013]

EXAMPLES The contents of claim 1 of the present invention will be explained below. First, in FIGS. 1 and 2 of the first embodiment, bearings 3 made of a metal having a high thermal conductivity or a sintered metal containing copper or iron are fixed to the left and right of a carrier 1 of a resin molded product. And the elastic member 7 made of stainless steel spring material,
The carrier 1 is positioned by elastic member holding portions 1c provided on the left and right side surfaces, and is sandwiched and mounted by the carrier 1 and the bearing 3.

A radiator 6 is attached to the dot head 2, and the dot head 2 has a head nose portion 2a.
It is positioned through a guide pin portion 1a provided on the carrier 1 and is detachably fastened to the carrier 2 with a fixing screw 8.

When the dot head 2 is attached to the carrier 2, the elastic member 7 is deformed and comes into pressure contact with the lower surface of the radiator 2.

The dot head unit having the above-mentioned structure is engaged with the drive belt 5 by the belt holding portion 1b provided on the carrier 1, and the bearing 3 is transmitted by the transmission of the motor drive.
The bidirectional conveyance is performed along the metal guide shaft 9 which is slidably fitted in the guide shaft 9.

The heat generated by the dot head 2 is transferred to the radiator 6
Is transmitted to the elastic member 7 which is in pressure contact. Since the transmission member 7 is made of a metal having a high thermal conductivity, it is transmitted to the bearing that sandwiches the transmission member, and further to the guide shaft 9 that is in a sliding relationship with the bearing.

The heat generated by the dot head 2 is transmitted to the radiator 6, the elastic member 7, the bearing, and the guide shaft, and at the same time, is radiated to the surroundings by these members.
The increased temperature of the dot head becomes low, and more stringent printing duty becomes possible. In the case of the same duty, there is an effect that the heat dissipation plate can be made smaller.

Further, since the elastic member is sandwiched and attached, the carrier does not need a shape in the width direction for fixing the elastic member, and the width of the carrier can be formed substantially the same as the radiator of the dot head. Further miniaturization is achieved.

In this embodiment, the belt drive is taken as the conveying means of the dot head unit, but the conveying means is not limited to this, and a rotary cam having a spiral groove cam may be used. .

Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the radiator 6 is eliminated from the first embodiment, and by mounting the dot head 2 on the carrier 1, the elastic member 7 is pressed against the lower surface of the dot head 2. Has become.

The first embodiment is effective for improving the heat radiation effect in the existing space as the dot head 2 is printed at high speed and high density, whereas the second embodiment is effective. In order to reduce the size and weight of the unit,
This is effective when the radiator 6 is abolished and at the same time, it is intended to prevent a decrease in the amount of heat radiation.

The elastic member 7, the radiator 6, the bearing 3, the guide shaft 9, and the frame for supporting the guide shaft 9 are made of metal or a conductive engineering resin containing a large amount of metal, so that the elastic member 7 is It can also be used as a ground member of the dot head 2.

Further, a silicon rubber material having a high thermal conductivity can be used as the elastic member 7. In this case, a silicon rubber material is adhered to the outer periphery of the bearing 3 and the dot head 2 or the lower surface of the radiator 6. Fill and cure.

As described above, in the first embodiment, by disposing the elastic member, it is not necessary to perform a post-process for forming the shape for attachment to the radiator after the extraction material is extracted, and the extracted shape is simply Since it can be manufactured in a simple shape that only needs to be cut, the cost of the radiator can be reduced. Further, in the second embodiment, since a radiator is not required, it is possible to provide a more inexpensive printing device.

Further, in both the first and second embodiments, even if the set position of the bearing 3 is changed depending on the model, it is not necessary to change the shape of the expensive radiator 6 only by changing the elastic member, and the bearing can be changed. The height of the carrier 1 can be reduced by disposing the carrier 1 just below the head nose 2a away from the radiator.

Further, when mounting the dot head 2 on the carrier 1, the width of the carrier 1 and the radiator 6 can be reduced because the head nose portion 2a which does not exceed the width of the dot head 2 is fixed to the carrier 1.

Next, the content of claim 2 in the present invention will be explained.

In FIGS. 5 and 6 of the third embodiment, similarly to the above-described first embodiment, the bearing 3 is fixed to the left and right to the carrier 1 made of resin, and the elastic member 7 is It is positioned and held by elastic member holding portions 1c provided on the left and right side surfaces of the carrier 1, and is sandwiched between the carrier 1 and the bearing 3 in a state of being fitted into the bearing 3.

The dot head 2 is fitted to the radiator 6, and the dot head 2 is positioned at the head nose portion 2a through the guide pin portion 1a provided on the carrier 1 and is provided on the elastic member 7. By engaging the square window 7a and the protrusion 6b provided on the radiator 6, the radiator 6 is held by the carrier 1 together with the dot head 2, and at the same time, the elastic member 7 is pressed against the side surface of the radiator 6. ing.

In FIGS. 7 and 8 of the fourth embodiment, in this case, the radiator 6 is eliminated from the third embodiment,
The side surface of the dot head 2 is pressed and held by the elastic member 7.

The third embodiment is effective for improving the heat dissipation effect in the existing space as the dot head 2 is printed at high speed and high density, whereas the fourth embodiment is effective. In order to reduce the size and weight of the unit,
This is effective when the radiator 6 is abolished and at the same time, it is intended to prevent a decrease in the amount of heat radiation.

In the dot head unit having the structure of the third and fourth embodiments, the dot head 2 can be attached to and detached from the carrier 1 without using the fixing screw 8.

[0034]

As described above, according to the present invention, a bearing formed of metal or sintered metal, which is attached to a carrier and slides on a guide shaft, and a dot head or a radiator of the dot head and a bearing. By having a heat transfer member that is in contact with both sides and is formed of a metal plate and has elasticity, the heat transfer member is surely in contact with the dot head or the radiator, so the heat generated from the dot head does not contact the heat transfer member. A heat transfer path is formed to reach the bearing and further to the guide shaft, so that the heat dissipation effect is improved.

Furthermore, the radiator can be made into a simple shape at a lower cost, and further, the bearing position can be set regardless of the shape of the radiator, so that the size and weight can be reduced.

Further, since the heat transfer member has the holding means for the dot head, the dot head is fixed only by the heat transfer member, so that the printing apparatus having excellent operability of mounting can be achieved.

[Brief description of drawings]

FIG. 1 is a left side view of a dot head unit according to a first embodiment of the invention.

FIG. 2 is a back cross-sectional view of the dot head unit according to the first embodiment of the invention.

FIG. 3 is a left side view of the dot head unit according to the second embodiment of the invention.

FIG. 4 is a back cross-sectional view of the dot head unit according to the second embodiment of the invention.

FIG. 5 is a left side view of the dot head unit according to the third embodiment of the invention.

FIG. 6 is a back cross-sectional view of the dot head unit in the third embodiment of the invention.

FIG. 7 is a left side view of the dot head unit according to the fourth embodiment of the invention.

FIG. 8 is a back cross-sectional view of the dot head unit in the fourth embodiment of the invention.

FIG. 9 is a left side view of a dot head unit in a conventional example.

FIG. 10 is a back sectional view of a dot head unit in a conventional example.

[Explanation of symbols]

 1 carrier 1a guide pin part 1b belt holding part 1c elastic member holding part 2 dot head 2a head nose part 3 bearing 4 wiring cable 5 drive belt 6 radiator 6a fixing part 6b protruding part 7 elastic member 7a square window part 8 fixing screw 9 Guide shaft

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B41J 25/34 B41J 3/10 103 B 25/28 Z

Claims (2)

[Claims] 1. In a printing apparatus in which an impact type dot head is mounted on a carrier made of metal and moving bidirectionally on a guide shaft, the printing device is made of metal or sintered metal, and is attached to the carrier. A bearing that slides on the guide shaft; and a heat transfer member that is in contact with both the dot head or the radiator of the dot head and the bearing and that is formed of a metal plate and has elasticity. Printing device. 2. The printing apparatus according to claim 1, wherein the heat transfer member has a holding means for the dot head.