JPH02155748A - Impact dot head - Google Patents

Abstract

PURPOSE:To obtain an impact dot head which is capable of high quality printing and easy to assemble with a side pressure applied to wire uniformly by allowing the position of a hole for a wire guide nearest to a lever to meet the lever, and providing levers circumferentially around a heat shaft center. CONSTITUTION:Levers 3 are arranged radially from a head shaft center at an equal interval, and are arranged on the circumference centering around the head shaft center with the position of a guide hole 5a for a wire guide 5 which is nearest to the lever 3 being allowed to meet the lever 3. A side pressure which each wire 6 engaged with the tip of each lever 3 receives from the wire guides 5a,9a is almost entirely determined by the position of the guide hole 5a for the wire guide nearest to the lever 3. Consequently, the bending angle theta of each wire 3 becomes the same, that is, the side pressure and a return spring force from the guide hole 5a are set so that their combined force is constantly applied to every wire 6. Therefore, the printing force and flying time of each wire become uniform and thus the stable behavior of each wire 6 is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a print head for an impact dot printer.

[Problems to be Solved by the Invention] However, in the hole position arrangement of the conventional wire guide, each printing wire receives different side pressures from the guide guide due to the mechanism, and therefore, when the wire return spring force is made the same for each wire, Since the load acting on the wire is a different lateral pressure return spring force from the guide, variations in flight time and printing force occur, resulting in problems such as deterioration of printing quality. In addition, in order to keep the load acting on each wire constant, the above problem can be solved by adjusting the force of each return spring, that is, by changing the shape of each return spring, but the ease of assembly can be improved by identifying the springs, etc. This will create new problems such as significant harm.

Therefore, the present invention solves these conventional problems.1.-
Therefore, it is an object of the present invention to provide an impact dot head that uniformizes the side pressure acting on the wire, has excellent printing quality, and is easy to assemble.

[Means for Solving the Problems] In order to solve the above problems, the impact dot head of the present invention has holes in the wire guide closest to the lever that are arranged in a circumferential manner around the axis of the head so as to correspond to the lever. It is characterized by:

[Function] The impact dot head configured as described above can easily make the load force of each wire constant, and it is possible to obtain an impact dot head with high print quality and excellent assemblability.

[Examples] Examples of the present invention will be described below based on the drawings. FIG. 1 is a sectional view of the impact dot head of the present invention. The upper half of Figure 1 shows the standby state when the electromagnetic coil 2 is not energized, and the lower half shows the printing state when the electromagnetic coil 2 is energized.During standby, the lever 3 is moved to the stopper 7 by the return spring 4. The wire 6 that is pressed and engaged with the lever 3 is biased to the non-printing position.

During printing, when the electromagnetic coil 2 is energized, the lever 6 is attracted to the coil core 1 by the magnetic flux generated in the coil core 1, and is struck onto the recording paper 8 via the wire 6 held at the tip to perform printing.

FIG. 2 is an enlarged view showing details of the wire guide member 5 closest to the lever 3, which is a feature of the present invention. A plurality of levers 5 are arranged in equal radial divisions from the head axis, and the position of the guide hole 5α of the wire guide 5 closest to the lever 3 corresponds to the lever 5, and the levers 5 are arranged in a circle around the lower axis of the spatula. It is placed around the circumference.

FIG. 5 is an enlarged cross-sectional view of FIG. 2. Each wire 6 engaged with the tip of each lever 5 has a wire guide hole 5α,
The side pressure received from 9α and 10α is largely determined by the position of the guide hole 5α of the wire guide 5 closest to the lever 3 due to purchasing mechanics. Since the lateral pressure return spring force from the wire 6 is set to be constant for all wires 6, there is no variation in the printing force and flight time of each wire 6, and stable behavior of each wire 6 is obtained.

[Effects of the Invention] As explained above, according to the present invention, the maid closest to the lever determines the side pressure of the wire so that the side pressure that each wire receives from the guide hole is the same. By making the positional relationship of the corresponding guide holes the same, the wire load force, trenchment, and lateral pressure return spring force are the same for each wire, and the printing force of the wire,
Suppresses variations in flight time and enables high print quality. Furthermore, since the same return spring can be used for each wire, it is possible to greatly improve assembly efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is a detailed diagram of the main part of the present invention. FIG. 3 is an enlarged cross-sectional view of FIG. 2. 1... Coil core 2... Electromagnetic coil 3... Tsuku-4...
...Return spring 5...Wire guide, de 5α...Guide hole 6...Wire 7...Stopper 8... Recording paper 9... Wire guide 9α... Guide hole 10... Tip guide 1012... Guide hole

Claims (1)

[Claims] In an impact dot head in which at least a plurality of levers are arranged in equal radial divisions from the head axis, and a plurality of guides for aligning wires coupled to the levers, a wire guide closest to the lever is provided. An impact dot head characterized by having a guide hole that corresponds to the lever and arranged on the circumference around the head axis.