JPS5840513B2 - Printing wire guide arrangement device for wire printers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to wire printers, and more particularly to the guiding arrangement of printing wires thereof.

In this type of wire printer, the leading ends of a large number of printing wires are arranged close to each other in one vertical row or two staggered rows, and gradually spread out radially toward the rear, with the trailing ends arranged in the same circumference. There is a wire printer that has a guide arrangement that looks like this.

The guide arrangement of the printing wires in this conventional wire printer is such that the topmost printing wire at the tip is inserted into the topmost guide hole at the rear, and each printing wire is alternated left and right in the order in which the tip goes down. It was designed to be distributed through the guide holes and inserted into the guide holes.

According to this conventional printing wire guide arrangement law, each printing wire is guided in a very orderly radial manner when viewed from the front (see Figure 8), and it is also easy to insert each printing wire into the guide hole. be.

However, on the other hand, there was a drawback that the vicinity of the tip of each printing wire was very close together.

For this reason, when each printing wire is individually guided and supported by a hollow, eve-shaped guide member, this guide member cannot be extended to the vicinity of the tip guide.

Therefore, especially when the number of printing wires is large and the diameter of the printing wires is small, such as in a wire printer for Chinese characters, lateral vibration of the printing wires is likely to occur, making the printing operation unstable.

The present invention eliminates the above-mentioned drawbacks of the prior art, and will be described below with reference to the accompanying drawings.

The wire printer of this embodiment consists of a wire guide block N and a wire drive block B as shown in the first diagram.

The hollow frame 1 of the wire guide block A is the mounting plate 2
The tip guide 3, support plate 4,
5 and 6 are fixedly installed.

A stepped pillar 7 is fixed to the center of the mounting plate 2, and two printing bin guide plates 8, 9 are mounted in parallel at a predetermined interval.

Hollow guide pipes 10 are inserted and held in the support plate 4° 5.6 toward the tip guide 3, respectively, and 22 printing wires 11 are slidably guided by these guide pipes and the tip guide 3. ing.

A printing pin 12 is fixed to the rear end of each printing wire 11, and each printing pin 12 is attached to the printing bin guide plate 8,
9 so as to be slidable.

Each printing wire 11 is moved backward (
(left side in Figure 1).

The alignment of the leading ends and rear ends of the printing wires 11 will be described in detail later.

Next, the wire drive block B will be explained.

The wire drive device 1 is mounted on the substrate 14 of the wire drive block B.
5 is installed.

The wire drive device 15 includes a swingably supported printing lever 16 and an iron core portion 16 integrally extending from the printing lever.
It consists of a drive coil 17 for magnetizing the iron core 16a, and two fixed magnetic pole plates 19 and 20 that face the end of the iron core 16a and are magnetized with different polarities by a plate-shaped permanent magnet 18. , these are integrated into the unit frame 21.

Each of the 22 wire drive devices 15 has a mounting screw 2.
2 to the substrate 14 at a predetermined distance.

The wire guide block A and wire drive block B configured as described above are integrally connected by the connecting screw 23 and the screw 24 at the rear end of the support column 7, and in this connected state, each printing pin 12 and each printing lever 16 are closely opposed to each other with a small gap therebetween.

Note that 25 is an ink ribbon, 26 is a recording paper, and 27 is a fixed platen.

Next, the guide arrangement state of the printing wire 11, etc. will be explained in detail.

The wire diameter of the printing wire 11 in this actual case is 0.20 mm, and the guide pipe that guides this printing wire almost along its free deflection curve has an inner diameter of 0.22 mrtt and an outer diameter of 0.50 mm.

The printing pin 12, that is, the rear end of the printing wire 11 is connected to the second
As shown in the figure, half of the 11 wires are arranged at equal intervals on two concentric circles C1 and C2, and the rear end of the printing wire on the circumference C1 and the rear end of the printing wire on the circumference C2. are shifted by half a pitch from each other.

On the other hand, the tip of each printing wire 11 is gathered by the tip guide 3 shown in the first figure and arranged in two staggered rows in a direction perpendicular to the scanning direction of the print head (vertical direction) as shown in the second figure. I'll be there in the evening.

The printing wire 11 whose rear end is located on the inner circumference C1 is guided so that its tip is located on the inside a by the tip guide part, and the printing wire 11 whose rear end is located on the outer circumference C2 is guided so that its tip is located on the inside a. The wires 11 are distributed and guided so that the top five tips are positioned on the outer side above the inside a, and the bottom six tips are placed on the outside side below the inside a.

By the way, the printing bin guide plates 8 and 9 shown in the first figure are installed at positions approximately 90 mm and approximately 100 u away from the front end surface of the tip guide 3, and their guide holes are 18 mm in diameter and 15 mm in diameter, respectively. It is perforated on the circumference.

Therefore, the arrangement circumferences C2 and C of the rear end of the printing wire 11
1 is approximately equal to the above diameter.

Further, the printing wire 11 corresponding to the inner circumference C1 is located on the circumference C1' having a diameter of approximately 13 degrees at the same position as the outer circumference C2.

Also, the vertical arrangement pitch t of the tip of each printing wire 11
and staggered row spacing are each 0.20 in this example.
Designed between mm and 1.

As the printing wires 11 guided and arranged as described above approach the tip guide 3 shown in the first drawing, they approach each other as shown in the third drawing.

In FIG. 3, the radially extending one-dot chain line is the center line of each printing wire 11 shown in the second diagram, and the polygonal lines 11, 1
The black circle connecting 2 and 13 is 77.5 from the wire tip.
Between, 52.071!711. and the position of each printing wire 11 at a distance of 22 degrees.

The guide pipes 10 that guide each printing wire 11 substantially along its free bending curve have their outer circumferential surfaces partially in contact with each other at the bending line 13 position.

That is, as shown in the second figure, each printing wire 11 is guided by the guide wire 1.
When the guide pipe 10 shown in the first figure is
It can be installed up to approximately 22mm from the front edge of the

Next, each printing wire 11 is guided and arranged in a conventional manner under the conditions that the number of printing wires 11, the arrangement of their rear ends, and the arrangement of their tips are the same as in the first actual case. The advantage of the printing wire arrangement according to the present invention will be clarified by explaining the case of one wire.

That is, according to the conventional method, each printing wire 11 is arranged as shown in FIG. 7 when viewed from the front.

The arrangement position of the rear end portion of the printing wire 11 is the same as in the first embodiment.

However, the tips, for example for the right half, are guided and aligned in sequence from top to bottom according to the clockwise order of the printing wire 11.

When viewed from the front, each printing wire 11 is arranged in a very orderly radial guide arrangement, and it is easy to insert the printing wire 11 into the guide member.3 However, the printing wire 1
1 rapidly approaches and becomes denser as it approaches the tip.

FIG. 8 shows how each printing wire 11 approaches in this case.

In FIG. 8, the radially extending one-dot chain lines are the center lines of the printing wires 11 in the arrangement shown in FIG. 7, and the broken lines 14. l6.7. The black circle connected at is 77 from the wire tip.
．． 5mm, 42. The position of each printing wire at a distance of OmJ32, Qmi is shown.

As is clear from FIG. 8, several of the guide pipes 10 have already collided or touched each other at the bend line 16 position 32.0 mm behind the wire tip.

That is, the guide pipe 10 is approximately 3 mm from the tip of the wire.
You can only get as close as 5 to 40 mountains behind.

Note that in the first embodiment according to the present invention, the printing wire 1
Although the arrangement of the tips of No. 1 is staggered, the present invention is not limited to this.

For example, they may be arranged vertically in a line as shown in the fourth figure, or
Alternatively, as shown in Figure 5, it may be arranged diagonally in one row.

In short, it is sufficient that the arrangement pitch t in the vertical direction, that is, in the direction orthogonal to the scanning direction of the print head, is constant.

Furthermore, the arrangement of the rear end portions of the printing wires 11 is not limited to the double arrangement.

FIG. 6 shows a printing wire arrangement based on the present invention in which the tip arrangement of the 18 printing wires 11 is in a single vertical row, and the rear end arrangement is a triple arrangement, and the rear end portion is the innermost circumference. The six printing wires 11 on C1 are guided to the inside a at their tips, and half of the six printing wires 11 whose rear ends are on the second circumference C2 are guided inside a. Half of the six printing wires 11, which are guided to the outermost sides of a and whose rear ends lie on the third circumference C3, are led to the outermost sides c and c.

In this case as well, the guide pipe 10 can be placed closer to the tip of the wire than in the conventional printing wire arrangement.

As described above, according to the printing wire arrangement according to the present invention, when each printing wire is guided by a pipe-shaped guide member, the printing wire can be guided close to the tip of the wire.

Therefore, when an impact force is applied to the printing wire, lateral vibration (bending) of the wire does not occur, the printing operation and the responsiveness of the wire are stabilized, and high quality printing is possible.

This effect is particularly noticeable when the number of printing wires is large and the wire diameter is small, such as a wire printer for kanji characters.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing the main parts of a wire printer according to an embodiment of the present invention, FIG. 2 is an enlarged front view showing the guide arrangement of the same printing wire, and FIG. An explanatory diagram showing how the wires approach each other as they approach the tip, FIGS. 4 and 5 are enlarged front views showing other examples of the arrangement of the tips of the above printing wire, and FIG. 6 is another actual case according to the present invention. FIG. 7 is an enlarged front view showing the guide arrangement of the printing wire in FIG. FIG. 8 is an explanatory view showing how the printing wire shown in FIG. 7 approaches the tip as it approaches the tip. 3.10... Guide member, 11... Printing wire, 15... Wire drive device, C1, C
2, C3...Multiple concentric circles.

Claims (1)

[Scope of Claims] 1. The tip portions of a large number of printing wires are closely arranged by a tip guide, and the rear ends are arranged on multiple concentric circles, and the above is performed by a wire driving device installed in multiple stages. In a wire printer configured to drive the rear end of the printing wire, the printing wire corresponding to the innermost circumference of the multiple concentric circles is aligned inside the tip guide, and n (n is 2 or more). The printing wires corresponding to the concentric circumferences of the overlapped (integer number) are distributed and aligned in the above-mentioned tip guide so that approximately half of them are each distributed to the outside of the tip of the printing wire corresponding to the (n-1) overlapped concentric circumferences. A guide arrangement device for printing wires in a wire printer, characterized in that each of the printing wires is guided by having an intermediate portion slidably fitted into a guide pipe on the other side.