JPH0245004Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a spring charge type print head that is not only easy to assemble but also enables highly accurate printing.

[Prior art]

Conventionally, when setting the printing wire in a spring charge type print head, the third
As shown in the figure, the wire guide path 1 of the nose 11
Attachment grooves 13 and 14 are provided at the middle and the tip of the head body 17, respectively, and the intermediate guide 15 and the tip guide 16 of the wire are engaged with these attachment grooves 13 and 14 and fixed in advance, and then the wire 18 is extended from the head body 17. of,
Intermediate guide 1 from rear opening 19 of nose 11
5 and the guide hole (not shown) of the tip guide 16 to set it.

[Problems to be solved] As mentioned above, in the conventional spring charge type print head, the intermediate guide and the tip guide of the wire are engaged and fixed in the respective mounting grooves of the nose, and then , the wire is inserted into the guide holes of the intermediate guide and the tip guide from the rear of the nose. Therefore, there were problems in that the work of inserting the wires was troublesome and it took a lot of time to assemble.

In addition, since the intermediate guide and the tip guide are attached to the nose by engaging both guides with the mounting grooves, some wobbling occurs in both guides, and this wobbling causes printing accuracy. There was a problem that was said to have a negative impact on

In addition, as shown in Japanese Patent Application Laid-Open No. 56-37173, there is also a spring charge type print head in which a wire is supported by an intermediate guide and a tip guide, and then these guides are engaged with respective mounting grooves in the nose. However, in this example, the opening at the rear of the nose must be left wide open, and the wire must be bent to engage the intermediate guide and the tip guide in their respective mounting grooves, which is different from the conventional example described above. It had different operational difficulties. Further, since the opening at the rear of the nose had to be made large, there was a problem in that the operating noise inside the head body leaked outside and was very noisy.

[Means for solving problems]

The present invention has been made in view of the above problems, and includes forming an intermediate guide attachment part with a step that becomes thicker on the head main body side in the middle of the wire guide path of the nose, and The wire guide path on the side of the head body is formed into a tapered shape that gradually widens toward the head body, and the intermediate guide with the wire inserted into the guide hole in advance is inserted into the attachment part of the intermediate guide from the tapered part side of the wire guide path. It has a press-fit configuration. As a result, the present invention facilitates the assembly of a spring charge type print head, thereby facilitating and shortening the assembly work and improving printing accuracy.

In addition, with this invention, each guide can be attached to the nose without bending the wires, so the opening at the rear of the nose can be made smaller, which prevents the operating noise inside the head body from leaking to the outside. , which improves the soundproofing effect.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 and 2.

In the drawing, 1 is the main body of the print head;
It contains an armature 1a, a core 1b, a coil 1c, a permanent magnet 1d, and a leaf spring 1e. wire 2
has one end connected to the tip of the armature 1a, and in advance, the permanent magnet 1d attracts the armature 1a, the leaf spring 1e provided at the base of the armature 1a is bent, and A current is passed through the coil 1c in a direction that generates magnetic flux to perform a printing operation.

Reference numeral 3 denotes an intermediate guide that supports the intermediate portion of the wire 2, and the wire 2 is inserted into the guide hole 3a so as to be able to reciprocate. This intermediate guide 3 has a predetermined dimension A to support a large number of wires 2. 4 is a tip guide that supports the tip of the wire 2, and the wire 2 is inserted into the guide hole 4a so as to be able to reciprocate. This tip guide 4 has a predetermined dimension B to support a large number of wires 2.

Reference numeral 5 denotes a nose that guides the wire 2 to the printing position, and a wire guide path 6 is formed in the center of the nose. Reference numeral 7 denotes a mounting portion for the intermediate guide 3 formed by providing a step in the middle of the wire guide path 6. The step of the mounting portion 7 is wider on the head main body 1 side, and the width thereof is approximately the same as the dimension A of the intermediate guide 3. Further, the wire guide path 6 that continues from the step of the mounting portion 7 to the head main body 1 side is formed in a tapered shape that gradually widens toward the head main body 1 side. Reference numeral 8 denotes a mounting portion for the tip guide 4 formed at the tip of the nose 5. The wire guide path 6 between the intermediate guide mounting part 7 and the distal guide mounting part 8 is formed with a uniform width, and the width dimension is narrower than the dimension B of the distal guide 4. . Reference numeral 9 denotes an opening provided on the head body 1 side of the nose 5, that is, at the rear of the wire guide path 6.

In the spring charge type print head of this embodiment having such a configuration, first, the wire 2 connected to the armature 1a is connected to the intermediate guide 3.
It is reciprocatably supported in a guide hole 3a. Next, the intermediate guide 3 supporting the wire 2 is attached to the nose 5.
Attach to. At this time, the intermediate guide 3 is attached to the step of the attachment part 7 from the direction in which it passes through the opening 9 of the wire guide path 6 and becomes wider. Here, since the step of the attachment part 7 and the width dimension B of the intermediate guide 3 are the same, the intermediate guide 3 is
It is press-fitted and installed without any wobbling. When attaching the intermediate guide 3 to its attachment portion 7 as described above, adhesive is applied to the joint surface of the intermediate guide 3 and attachment portion 7, so that the intermediate guide 3 can be attached to the mounting portion 7 while supporting the wire 2. It is firmly attached to the mounting part 7 having a.

On the other hand, a tip guide 4 supporting the tip of the wire 2
After inserting each wire 2 protruding from the tip of the nose 5 into the guide hole 4a and supporting it reciprocally,
It is attached to the attachment part 8 formed at the tip of the nose 5.
Also in this case, since adhesive is applied to the bonding surface between the tip guide 4 and its attachment portion 8, the tip guide 4 is firmly attached to the attachment portion 8.

In this way, in the spring charge type print head of this embodiment, the intermediate part and the tip part of the wire 2 are supported by the intermediate guide 3 and the tip guide 4, respectively, and the attachment part 7 of the intermediate guide of the nose 5 is provided with a step. The intermediate guide 3 is press-fitted into the step and attached to the mounting portion 7. Further, an opening 9 provided at the rear of the nose 5 and continuous with the wire guide path 6 is also a small hole large enough to pass the wire 2, its intermediate guide 3, and its distal guide 4.

[Effect of idea]

According to the present invention as described above, since the wire is inserted into the intermediate guide in advance and the intermediate guide is attached to the nose, assembly can be easily and quickly performed. In addition, since the intermediate guide is attached to the mounting portion using a step and a tapered wire guide path to prevent rattling, the wire does not run out and printing accuracy can be improved. Furthermore, since there is no need to bend the wires when attaching each guide to the nose, the opening at the rear of the nose can be made smaller, preventing leakage of operating noise within the head body and improving the soundproofing effect.

[Brief explanation of drawings]

Figure 1 is an exploded plan view of one embodiment of the present invention;
The figure is a perspective view of the assembled state of the one in Figure 1, and the one in Figure 3.
The figure shows an exploded plan view of a conventional example. 1... Print head body, 2... Wire, 3
... intermediate guide, 4 ... tip guide, 5 ... nose, 6 ... wire guide path, 7 ... intermediate guide attachment section, 8 ... tip guide attachment section, 9 ... opening.

Claims (1)

[Scope of utility model registration request] The middle part and the tip part of the wire are supported in a reciprocating manner by an intermediate guide and a tip guide, respectively, and a step is formed in the middle of the wire guide path of the nose by making the head main body side thicker, and the wire is inserted in advance. What is claimed is: 1. A spring charge type print head comprising: a mounting portion for an intermediate guide; and a wire guide path from the mounting portion of the intermediate guide to the head main body is formed in a tapered shape that gradually widens toward the head main body.