JPH0465251A - Wire dot record head - Google Patents

Abstract

PURPOSE:To arrange levers without bending wires, enhance the recording speed, and relax the precision in processing and assembling works by arranging wires at wider distances. CONSTITUTION:The lower half part of a conventional diamond-shaped pin arrangement is shifted by one pitch and a diamond shape is formed by thirteen pitches each on the left and right sides. When pins are arranged at vertical distances Y and horizontal distances X, the distance between every adjacent pins is sq. rt. X<2>+Y<2>. sq. rt. X<2>+Y<2> is determined so as to be larger than two when Y=1, and a sufficient distance is maintained even at both ends of the diamond shape. Therefore, the precision in processing parts such as wire guides of a wire head and in assembling parts can be relaxed in comparison with conventional one, resulting in a reduction of production cost. Driving levers can be arranged just behind wires 1, and unlike conventional ones, it is unnecessary to bend and narrow down the wires, so that the wires 1 can be driven at a high speed and the recording speed can be increased.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a wire dot recording head, and more specifically, the present invention relates to a wire dot recording head, which has a plurality of wires arranged at a predetermined pitch in the recording sub-scanning direction and moves in the recording main scanning direction. The present invention relates to a wire dot recording head (abbreviated as "wire head") that performs dot recording by striking a recording medium with the wire.

[Prior Art] In recent years, this type of wire head has been widely used with a configuration of 24 wires, also called bins, and the arrangement of the tips of the wires that impact the ink ribbon (the arrangement when viewed toward the front of the head) has been widely used. ), the so-called staggered bin arrangement has generally been used.

This bin arrangement is shown in FIG. 2(A). The tips of the wires 1 shown in circles are arranged in a straight line along the vertical direction (sub-scanning direction of recording), 12 wires per row, and arranged in two rows at an interval of 9/180 inches (1.27 mm). Two rows of wires alternately extend 1/180 inch (0,1
They are arranged at a pitch of 4mm).

The arrangement of each wire l is shown in FIG. 2(B) in the wire guide 2.
regulated by. The rear end of each wire 1 is connected to a drive lever 3 (only the wires 1 at both ends are shown)
. The drive lever 3 is provided so as to be rotatable in directions a and b about a shaft 3a as a fulcrum, and is rotated in directions a and b by the driving force of a solenoid (not shown) and the spring force of a return spring. Drive lever 3
When the wire 1 is rotated in the direction a, the wire 1 protrudes along its length and hits an ink ribbon (not shown) to record dots. The wire head is in the main scanning direction (Fig. 2 (A)
Characters and the like are recorded in a dot matrix pattern by selectively driving each wire 1 while moving in the left and right directions.

In a wire head with such a staggered bin arrangement, the interval between the upper and lower bins in one row is 2/180 inch (0,2
8 mm)L, the wire 1 near both the upper and lower ends and the tip of the drive lever 3 cannot be placed directly behind the wire guide 2. Therefore, the wire 1 near both ends must be extended and bent to ensure a distance between the drive levers 3. Therefore, there is a limit to how fast the wire can be driven. Furthermore, since the bin spacing is narrow, high accuracy is required in the machining accuracy of parts such as wire guides and the assembly accuracy of the head.

Therefore, recent wire heads have come to use a diamond-shaped bin arrangement. An example of this is shown in Figure 3 (A), (
Shown in B). In FIG. 3(A), the vertical pitch of each bin is 1/180 inch (0.14 mm) (56 mm) pitch, compared to the staggered arrangement of FIG. 2(A). Therefore, according to such a diamond-shaped arrangement, the left-right spacing between adjacent bins on the left and right is 4.12/180 inches (0°5), as shown in Figure 4.
8 mm) or 4.47/180 inches (0,
63 mm), which is wider than the staggered arrangement, and the distance between each wire 1 is widened, and the drive lever 3 of the wire 1 at both the upper and lower ends is also placed with its tip directly behind the wire guide 2, as shown in Figure 3 (B). There is no need to bend the wire 1 to narrow it down, the wire length can be shortened, and the speed can be increased.

[Problem to be solved by the invention] However, the vertical distance between the bins at both left and right ends of the diamond is 2.
/180 inch (0.28 mm), which is the same as in the staggered arrangement. Therefore, even if the wires 1 at both left and right ends are arranged in a diamond shape, the distance between the drive levers 3 is narrow, requiring particularly high machining and assembly precision, making high-speed printing difficult.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks in a wire head, to increase recording speed, and to reduce processing accuracy and assembly accuracy.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a plurality of wires arranged at a predetermined pitch in the sub-scanning direction of recording, and wires that move in the main scanning direction of recording. In a wire dot recording head that performs dot recording by impacting a recording medium with the wire, the tips of the wires are arranged in a predetermined annular arrangement when viewed toward the front of the head, and A structure was adopted in which the pitch was set to 1 and the intervals between adjacent wires were all set to be larger than 2.

[Function] According to such a structure, since the wire intervals are all set large, the wire drive member (drive lever 3) can be arranged without bending the wire, and the wire can be driven at high speed. Furthermore, the processing accuracy and assembly accuracy of parts such as wire guides can be reduced.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the bin arrangement of the wire head of this embodiment (the arrangement of the wire tips as viewed from the front of the head). The arrangement of this embodiment is such that the wire 1 in the lower half of the diamond-shaped array of the conventional example shown in FIGS. 3(A) and 4 is moved one pitch (4/180 inch ), which forms a diamond shape at 13 pitches in the main scanning direction. The structure of the wire head of this embodiment other than the wire arrangement is the same as that of the conventional example described above.

As a result, the vertical pitch of each bin is 1/180 inch, and the horizontal pitch is 4/180 inch.In other words, all bins have a vertical pitch of Y and a horizontal pitch of X, and all adjacent bins have a pitch of X" + Y" ( 7) Interval: S'), Y h51 (7) Interval tiM(X”+Y”
) is set to be greater than 2. With this arrangement, sufficient distance between the bins can be ensured at both the left and right ends of the rhombus, making it possible to lower machining accuracy than before in machining parts such as the wire guide of the wire head and assembling each part, thereby reducing manufacturing costs. can be suppressed.

In addition, all of the aforementioned drive levers for each wire 1 can be placed directly behind the wire guide, and the wire 1 does not have to be bent and squeezed as in the conventional example shown in FIG. 2(B), and the wire 1 can be driven at high speed. Recording speed can be increased.

In addition, in the bin arrangement of the present embodiment described above, the lower half of the conventional diamond arrangement was shifted by 1 pitch to form a diamond with 13 pitches on the left and right, but the lower half of the diamond arrangement was shifted by 2 pitches to form a diamond. The effect is the same even if the configuration or arrangement is shifted further.

Further, although the explanation has been made assuming that the number of wires is 24 bins, the effect is the same even if the number of wires is other than 24 bins. Further, the array shape is not limited to a diamond shape as long as it is annular, and may be, for example, a circle. In short, the wire (bin) arrangement is defined as follows: where Y is the wire pitch in the recording sub-scanning direction (usually the vertical direction) and X is the 1-wire pitch in the main scanning direction, the distance between all the wires is IY7〒■1
It suffices if it is a circular arrangement in which 2Y is set larger than 2Y.

[Effects of the Invention] As is clear from the above description, according to the present invention, a plurality of wires are arranged at a predetermined pitch in the recording sub-scanning direction, and the wires are moved in the recording main-scanning direction. In a wire dot recording head that performs dot recording by impacting a recording medium with a dot, two rows of the tips of the wires when viewed toward the front of the head are arranged in a predetermined annular arrangement, and one row of the wires in the sub-scanning direction is arranged in a predetermined shape. The pitch between all wires is fT”〒Y1, where the pitch is Y and one pitch in the main scanning direction is X.
We adopted a structure in which the eaves are set larger than the eaves 2Y.

According to such a structure, the distance between the wires is set to be thick, so the wire driving member can be placed without bending the wire, the wire can be driven at high speed, and the recording speed can be increased. The machining accuracy and assembly accuracy of head parts can be relaxed, and manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the arrangement of wire tips and wire spacing when viewed from the front of a wire dot recording head according to an embodiment of the present invention, and FIG. 2 (A) shows a staggered arrangement of wires in a conventional head. 2(B) is an explanatory diagram showing the arrangement of the wires of the conventional head and the drive lever that drives them, and FIG. 3(A) is an explanatory diagram showing the diamond-shaped wire arrangement of the conventional head. Figure 3 (B) is an explanatory diagram showing the arrangement of the wire and drive lever of the same head, and Figure 4 is Figure 3 (A).
FIG. 2 is an explanatory diagram showing the wire spacing of the wire arrangement. 1-・-Wire 2-・Wire guide 3・・
・Driving lever patent applicant: Juki Co., Ltd. Woo.

Claims (1)

[Claims] 1) A wire dot recording head that has a plurality of wires arranged at a predetermined pitch in the sub-scanning direction of recording, and performs dot recording by striking a recording medium with the wires while moving in the main scanning direction of recording, The arrangement of the tips of the wires when viewed toward the front of the head is an annular arrangement of a predetermined shape, and the pitch of the wires in the sub-scanning direction is 1, and the intervals between adjacent wires are all set to be larger than 2. A wire dot recording head featuring