JP4083922B2 - Impact dot printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impact dot printer.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is an impact dot printer that prints information on recording paper by driving a carrier carrying an impact dot printer head back and forth along a platen and driving the impact dot printer head in this process.
[0003]
In such an impact dot printer, it is important to manage the gap between the leading end of the impact dot printer and the recording paper on the platen. For this reason, it is necessary to accurately determine the relative position of the impact dot printer head with respect to the carrier.
[0004]
On the other hand, the impact dot printer head includes a plurality of electromagnetic coils arranged radially to drive a plurality of wires, and these electromagnetic coils are accommodated in a housing. Therefore, since the impact dot printer head generates heat during printing, it is necessary to transmit the heat to the carrier having a larger volume than the impact dot printer head, and further to dissipate heat by transmitting the heat from the carrier to the frame member or the like. The heat conduction is more advantageous as the contact area between members is larger.
[0005]
However, when accurately determining the position of the impact dot printer head with respect to the carrier, it is impossible to make contact with the impact dot printer head and the carrier over a wide area. I am letting.
[0006]
Therefore, for positioning, a part of the housing of the impact dot printer head is brought into direct contact with the carrier, and a bendable heat conduction member is sandwiched between the other part of the housing and the carrier. It has been broken. Examples thereof are shown in FIGS.
[0007]
4 and 5 are side views showing a state where the impact dot printer head 31 is attached to the carrier 30. FIG. In any case, the impact dot printer head 31 has a housing 32 and a nose 33 protruding from the end face of the housing 32. A plurality of wires (not shown) are slidably held on the nose 33, Electromagnetic coils (not shown) for driving these wires are arranged radially inside the housing 32. On both sides of the nose 33, head mounting pieces 35 that are attached to the carrier 30 by mounting screws 34 are provided. In this case, the position of the impact dot printer head 31 in the platen direction with respect to the carrier 30 is determined by bringing the front end surface 36 of the housing 32 on the nose 33 side into contact with the carrier 30.
[0008]
As a heat dissipation measure, in the example shown in FIG. 4, a heat conducting member 38 that elastically contacts the rear end surface 37 of the housing 32 is fixed to the carrier 30 by a screw 39. In the example shown in FIG. 5, the outer peripheral surface 40 of the housing 32. The heat conducting member 41 is sandwiched between the central portion 40 </ b> C and the carrier 30.
[0009]
[Problems to be solved by the invention]
In the example shown in FIG. 4, the reaction force of the heat conducting member 38 bent by the rear end surface 37 of the housing 32 acts as a force for bringing the front end surface 36 of the housing 32 into contact with the carrier 30. The position of the dot printer head 31 does not go wrong. However, because the housing 32 has the heat conduction member 38 in contact with the rear end surface 37 where the temperature of the electromagnetic coil is difficult to be transmitted even though the central portion 40C of the outer peripheral surface 40 surrounding the heat generating electromagnetic coil becomes the highest temperature. The heat dissipation effect becomes worse.
[0010]
On the other hand, the example shown in FIG. 5 has a good heat radiation effect because the heat conducting member 41 is in contact with the central portion 40C of the outer peripheral surface 40 of the housing 32 where the heat of the electromagnetic coil is easily transmitted and becomes high temperature. However, the reaction force of the heat conducting member 41 sandwiched between the housing 32 and the carrier 30 acts on the housing 32 on a plane away from the plane passing through the center of the mounting screw 34, and this force is centered on the mounting screw 34. Therefore, the impact dot printer head 31 is easy to tilt.
[0011]
SUMMARY An advantage of some aspects of the invention is that it provides an impact dot printer that can promote the heat dissipation effect without affecting the positioning of the impact dot printer head with respect to the carrier.
[0012]
[Means for Solving the Problems]
The invention according to claim 1 has an impact dot having a housing in which a plurality of electromagnetic coils arranged radially to drive a plurality of wires are housed, and head mounting portions are provided on both sides of the central portion of the housing. A printer head, a carrier having a head fixing portion for fixing the head mounting portion by an mounting member, and reciprocatingly driven along a platen, and a center of the mounting member for fixing the head mounting portion and the head fixing portion. And a bendable heat conducting member that is in contact with the housing within a plane passing through and sandwiched between the outer peripheral surface of the housing and the carrier.
[0013]
Therefore, the impact dot printer head is attached to the carrier by fixing the head attaching portion and the head fixing portion with the attaching member. Since the heat conducting member contacts the central portion of the outer peripheral surface of the housing where the temperature is highest, the heat dissipation effect is promoted. In this case, the heat conducting member bends by receiving the tightening force of the mounting member that fixes the head mounting portion and the head fixing portion at the center, and the reaction force due to the bending is within the plane passing through the center of the mounting member. Therefore, the position of the housing with respect to the carrier does not change.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view, and FIG. 2 is a side view showing a state in which an impact dot printer head is fixed to a carrier.
[0015]
The impact dot printer head 1 has a rectangular housing 2 and a nose 3 protruding from the end surface of the housing 2, and a plurality of wires 4 are slidably held in the nose 3 and drive these wires 4. Electromagnetic coils (not shown) are arranged radially inside the housing 2. Protruding pieces 6 having positioning holes 5 are provided on both sides of the nose 3, and head mounting pieces 9, which are head mounting portions having mounting holes 8, are provided on both sides of the outer peripheral surface 7 of the housing 2.
[0016]
The carrier 10 reciprocally driven along a platen (not shown) is formed with a recess 11 for housing the housing 2 of the impact dot printer head 1, and the surface 12 is fitted in the positioning hole 5 of the impact dot printer head 1. The positioning pin 13 is erected, and a head fixing piece 15 which is a head fixing portion having screw holes 14 is provided on both sides. Reference numeral 16 denotes an attachment screw as an attachment member screwed into the screw hole 14.
[0017]
The heat conduction member 17 sandwiched between the outer peripheral surface 7 of the housing 2 and the bottom surface of the recess 11 formed in the carrier 10 includes a first contact piece 18 that contacts the bottom surface of the recess 11 and the outer periphery of the housing 2. The second contact piece 19 that is in contact with the surface 7 and the tongue piece 20 that protrudes from both sides of the first contact piece 18 are integrally formed, for example, silicon rubber that is elastically deflectable and thermally conductive. Etc. The width of the heat conducting member 17 excluding the tongue piece 20 is determined to be equal to or slightly smaller than the width of the recess 11 of the carrier 10. And the opening 21 for making the tongue piece 20 protrude is formed in the both sides of the recessed part 11. As shown in FIG.
[0018]
Accordingly, the heat conducting member 17 has the first contact piece 18 in contact with the bottom surface of the recess 11 and the tongue piece 20 protrudes into the opening 21 without using a mounting member such as a screw. It is attached to the bottom of the. The impact dot printer head 1 is positioned by fitting the positioning hole 14 of the projecting piece 6 to the positioning pin 13 of the carrier 10, and the mounting screw 16 passed through the mounting hole 8 of the head mounting piece 9 is inserted into the head fixing piece 15. It is fixed by screwing into the screw hole 14.
[0019]
Here, the heat conducting member 17 is located in a plane passing through the center of the mounting screw 16 that fixes the head mounting piece 9 and the head fixing piece 15, and the second contact piece 19 is connected to the housing 2. The first contact piece 18 is elastically contacted with the bottom surface of the recess 11 by elastically contacting and bending the central portion 7C of the outer peripheral surface 7.
[0020]
In such a configuration, the second contact piece 19 of the heat conducting member 17 is in contact with the central portion 7C of the outer peripheral surface 7 of the housing 2 where the temperature is highest, so that the heat dissipation effect can be promoted. In this case, the heat conducting member 17 is bent by receiving the tightening force of the mounting screw 16 that fixes the head mounting piece 9 and the head fixing piece 15 at the center (in this example, the free end edge of the second contact piece 19). Bend. Since the reaction force due to the bending acts on the housing 2 in a plane passing through the centers of the mounting screws 16 on both sides of the housing 2, the position of the housing 2 with respect to the carrier 10 does not change.
[0021]
Next, a modified example will be described with reference to FIG. In this example, positioning holes 5 and mounting holes 8 are formed in the head mounting pieces 9 provided on both sides of the housing 2 of the impact dot printer head 1, and positioning pins 13 are erected on the head fixing pieces 15 of the carrier 10. In addition, a screw hole 14 is formed, and a projecting piece 22 for positioning the nose 3 of the impact dot printer head 1 is provided on the surface 12 on the platen side of the carrier 10. Since other configurations are the same as those of the above-described embodiment, the same portions are denoted by the same reference numerals, and description thereof is also omitted.
[0022]
When assembling, as described above, after mounting the heat conducting member 17 in the recess 11 of the carrier 10, the nose 3 of the impact dot printer head 1 is inserted between the projecting pieces 22 of the carrier 10 and the head mounting piece 9. The positioning hole 14 formed in the head fixing piece 15 is positioned by fitting with the positioning pin 13 erected on the head fixing piece 15, and the mounting screw 16 passed through the mounting hole 8 of the head mounting piece 9 is inserted into the head fixing piece 15. The impact dot printer head 1 is fixed by being screwed into the screw hole 14.
[0023]
Also in this example, the first contact piece 18 of the heat conducting member 17 is elastically contacted with the bottom surface of the recess 11, and the second contact piece 19 is in contact with the central portion 7 </ b> C of the outer peripheral surface 7 of the housing 2 having the highest temperature. Since it is in contact, the heat dissipation effect can be promoted. Further, the heat conducting member 17 bends by receiving the tightening force of the mounting screw 16 that fixes the head mounting piece 9 and the head fixing piece 15 at the center (the free end edge of the second contact piece 19). Since the reaction force due to the bending acts on the housing 2 in a plane passing through the centers of the mounting screws 16 on both sides of the housing 2, the position of the housing 2 with respect to the carrier 10 does not change.
[0024]
【The invention's effect】
According to the first aspect of the present invention, since the heat conduction member that can bend elastically is sandwiched between the outer peripheral surface of the housing of the impact dot printer head where the temperature is highest and the carrier, the heat dissipation effect is promoted. Can do. Furthermore, the heat conducting member is arranged in a state where it is in contact with the central portion of the outer peripheral surface of the housing in a plane passing through the center of the mounting member for fixing the head mounting portion provided on both sides of the housing and the head fixing portion provided on the carrier. Therefore, since the reaction force of the heat conducting member that is compressed and bent between the housing and the carrier acts on the housing in a plane passing through the center of the mounting member, it is possible to prevent the displacement of the housing with respect to the carrier. it can.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view thereof.
FIG. 3 is an exploded perspective view showing a modified example.
FIG. 4 is a side view showing an example of the prior art.
FIG. 5 is a side view showing another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Impact dot printer head 2 Housing 4 Wire 9 Head attachment part 10 Carrier 15 Head fixing part 16 Attachment member 17 Thermal conduction member

Claims (1)

An impact dot printer head having a housing containing a plurality of electromagnetic coils arranged radially to drive a plurality of wires, and having head mounting portions on both sides of the central portion of the housing;
A carrier having a head fixing portion for fixing the head mounting portion by an attachment member and driven to reciprocate along a platen;
A bendable heat conducting member that is in contact with the housing within a plane passing through the center of the mounting member that fixes the head mounting portion and the head fixing portion and is sandwiched between the outer peripheral surface of the housing and the carrier. ,
Impact dot printer with.

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