JPS5989174A - Printing head for wire dot printer - Google Patents

Abstract

PURPOSE:To provide a printing head for wire dot printer excellent in workability and wire bonding strength and capable of operating with high response, wherein a tip part of a lever formed of a plate material is bent to clamp a printing wire in an wrapping manner. CONSTITUTION:In a printing head wherein a printing wire 9 is connected to an end part of a lever 8 formed of a plate material, a connecting part of the lever 8 for the wire 9 is bent to wrap the wire 9, thereby constituting the printing head. It is preferable to fix the lever 8 and the wire 9 to each other by resistance welding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print head for a wire dot printer, and more particularly to a method for connecting print wires.

A wire dot printer head such as a spring-charged electromagnetic type is damaged due to the conventional printing head Lt driving method, Japanese Patent Publication No. 56-46989. As shown in Japanese Unexamined Patent Publication No. 57-110462, in these types of heads, a method was used in which the printing wire was butted against the tip 9114 of the armature and joined by brazing or the like.

With this structure, workability was poor and it was difficult to increase the bonding strength. For this reason, the armature was shaped to increase the contact area with the wire, which increased the inertial mass of the drive part, which worsened the wire's response.The wire was also exposed to high heat, causing it to deteriorate and its strength to decrease. It had some drawbacks, such as being stowed away.

Another conventional technique involves passing a wire through a hole drilled at the tip of the armature and joining it with brazing (Japanese Patent Application Laid-Open No. 57-88561), but the shape of the parts becomes complicated and the workability of the parts is poor. Bad 9: It had drawbacks such as poor assembly.

The present invention eliminates these drawbacks, and its purpose is to provide a print head that is easy to work with and has a sufficient number of wire connections.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 1 is a cross-sectional view of a print head showing an embodiment of the present invention.
Figure 2 is an exploded view of the drive unit.

The core 2 is fixed to the lower yoke 3 and fixed to the upper yoke 4 using a fixed shaft 12 that is inserted into the VC permanent magnet 1f:t. A lever 8 is attached to a plunger 6Vc at the free end of the leaf spring 7.
Let's all get together. Lever 8 is made of thin plate.
&13 As shown in Figure 13, the tip is shaped like a wire 9'f: rolled up, and both are fixed by resistance welding. The leaf spring 7 is fastened and fixed between the upper yoke 4 and the presser plate by a fixed shaft j2. Two electrode terminals 15 of the coil 5 wound around the core 2
, 16 have spring properties. This drive unit can be attached to and detached from the head body after being individually assembled and adjusted.

The assembly into the head body is carried out by engaging the protrusion 10α of the drive unit with the guide hole 1:(α of the head frame l:3, and then aligning the corresponding pattern of the wiring board J7 with the electrode terminal 15).
, 16 are pressed together for electrical connection. A rubber sheet 14 is interposed between the head frame 13 and the drive unit to prevent assembly problems due to uneven lengths between the drive units and to prevent noise generation.

The lever guide has a slit that guides the side surface of the lever 8, and has the function of preventing vibration in the direction perpendicular to the plane of the first drawing when the lever is actuated, and also has a positioning function when installing the drive unit.

Further, a portion 1oc of the presser plate IC) is used as a stopper when the lever 8 is in the standby position, and a stopper 11 made of a rubber material is attached to the collision surface with the lever 8.

After fixing the back cover 5 to the head frame 13 using the fixing spring 26, the head is assembled.

Next, the operation will be explained. The plunger 6 is attracted to the core 2 by the magnetic flux of the permanent magnet 1, and the leaf spring 7 is biased and held 1. When the coil 5 is energized for a certain period of time in a direction that cancels the magnetic field of the permanent magnet 1, the attracted state is released. The lever 8 rotates due to the elastic force of the leaf spring, and the wire 9 fixed to the tip
f: Protrude in the direction of the arrow. The nine wires collide with the IO recording paper via an ink ribbon (not shown) to form dots. 1 energized disciple, 6 plungers sucked again 1,
The wire 9 also returns to the standby position.

Shown in Figure 3! 11, the lever 8 is made of a thin plate and connects the free end of the leaf spring 7 to the wire 9; the lever 8 is bent into a shape that wraps around the wire 9 at the joint with the wire 9, and the two are fixed together by resistance welding. Because of this, the part shape is simple and the part workability is good, and even if the length of the contact part between the wire 9 and the lever 8 is shortened, the inertial mass is small.
High bond strength can be obtained with low inertia. In addition, since the force (anti-welding) only applies high temperature locally for a short period of time, there is no large thermal load applied to the joint of the wire 9 with the lever 8.
The strength of the wire 9 can be ensured, and the work can be done more easily and in a shorter time than brazing. Furthermore, since the joint is not butted or matched, the relative position of the wire 9 and the lever 8 can be determined easily, improving workability.

It goes without saying that the present invention is also applicable to other driving methods other than the spring charge method described in the embodiments.

As explained above, according to the present invention, by bending the tip of the thin plate lever, winding the wire, and fixing the wire by resistance welding, workability is improved compared to the conventional method.
Sufficient wire bonding strength can be obtained. Furthermore, since the thin plate lever is used, the drive part is lightweight and the inertial mass is small, so a print head for wire dot printers that can provide high response can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a print head showing an embodiment of the present invention;
FIG. 2 is an exploded view of the drive unit, and FIG. 3 is a diagram showing the state in which the lever and wire are connected. 6. Plunger 7-. Leaf spring 8. Q lever 9.
・Wire and above Applicant Epson Corporation Agent Saturn Senior Patent Attorney

Claims (1)

[Claims] ], In a print head in which a printing wire is coupled to an end of a lever, the lever may be bent in a shape where the coupling portion with the printing wire is wound around the printing wire. A print head for wire dot printers that features a wire dot printer. 2. The lever and the printing wire are fixed together by resistance welding.1. A print head for a wire dot printer according to claim 1, characterized in that: