JPH0410951A - Wire dot head - Google Patents

Abstract

PURPOSE:To improve printing capability and to obtain therewith high printing quality by setting area for each of cores in accordance with the arrangement of levers, and by uniformizing the behavior of every wire to a platen. CONSTITUTION:Levers 3 are held on the fulcrum thereof with supporting shafts 4 along the circumference of a frame 2. Wires 8, each of which is connected integral with each of the levers 3, are arranged in two lines and are positioned at the front end thereof with a front-end wire guide 9. Wire-inserting holes on wire guides 10-15 in optional numbers and wire-inserting holes 17 of spring holders 16 are arranged in a straight line for insertion of each of the wires until the wires reach wire-inserting holes 18 of the front-end wire guide 9. An optimum area is set for each of cores so that the output of each of the wires is applied uniformly on a platen 21. Thereby ununiformity of the output being derived from the difference in arrangement of the wires can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention 1 relates to a wire dot head which is a printing mechanism of a wire dot printer used in printers for computer peripheral terminals and the like.

[Conventional technology]

In the prior art, the core area 51 is always constant even for a plurality of levers, and the area setting is performed in accordance with the behavior of the wire integrally connected to the lever at the worst position in the arrangement of the levers. .

[Problem to be solved by the invention]

In the conventional structure, the levers are arranged on the circumference and the wires are arranged in one or more rows at the tip. Therefore, the wire insertion hole 54 of the wire guide for positioning the wire integrally connected to the lever is Depending on the arrangement, the wire dot head assembly must be set in different positions.

From this, due to the difference in the arrangement of the levers, the positional relationship of the wire insertion hole for positioning the wire is different, so the bending moment of the wire received from the insertion hole is all different. behavior will be different, and the output of the wire will also be different. As a result, when printing on copy paper, since the output is different for each wire, the copying ability is different for each wire, and there is a problem that printing shading is likely to occur.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a wire dot head that is excellent in improving printing ability and obtaining high printing quality.

[Means to solve the problem]

The electromagnetic coil attracts the lever to which the wires are integrally connected toward the core, and the wires pop out.The coil spring causes the levers to return toward the damper, causing the wires to behave, and the wires form one or more rows at the tip. A wire dot head characterized in that the core area of each wire dot head is set by the arrangement of levers so that the behavior of all the wires with respect to the platen is the same.

[For production]

When a constant voltage is applied to the electromagnetic coil, the magnetic force is proportional to the square ratio of the core area, assuming that conditions other than the core area are the same. Therefore, for each lever, which receives a different wire bending moment from the wire insertion hole in the wire guide due to the difference in the arrangement of the levers and the arrangement of the wire tips, the core is Each area is set, and the optimum input, that is, the suction force is applied to each area.

Therefore, the behavior and output of all wires can always be the same with respect to the platen.

〔Example〕

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a plan view of the main components. In both figures, the core surface 1 is
It is formed within the frame 2 on the same plane as the outer periphery.

The lever 3 is held on the circumference of the frame 2 using a fulcrum shaft 4 as a fulcrum. The fulcrum shaft 4 is positioned and held by a yoke plate A5, a yoke plate B6, and a fulcrum spacer 7. The wire 8 integrally connected to the lever 3 has a third
As shown in the figure, the wires are positioned and arranged in two rows by the tip wire guide 9.

wire insertion holes of an arbitrary number of wire guides 10 to 15;
And the wire insertion hole 17 of the spring holder 16 is
The wires are arranged in a straight line for each wire up to the wire insertion hole 18 of the distal wire guide 9.

Next, the present invention configured as described above will be explained in detail. The electromagnetic coil 19 is energized by the print signal, the lever 3 is attracted toward the core 1, and the wire 8 integrally connected to the lever 3 is attached to the printing paper 22 whose back side is held by the platen 21 via the ribbon 20. Printing is performed by collision.

In this embodiment, if the lever 3 and the wire insertion hole 23 of the spring holder 16 are positioned as shown in FIG.
Since it has the power to move in one direction, the core area is set small to reduce the suction force. If the lever 3 and the wire insertion hole 24 of the spring holder 16 are positioned as shown in FIG. Make it bigger.

Similarly to the above, by setting the core area of each wire to an optimal value so that the output of each wire is the same for the platen 21, it is possible to prevent uneven output due to differences in the arrangement of levers and wires. .

Although this example uses a direct suction type non-ballistic type wire dot head, the same effect can be obtained with any wire dot head such as a direct suction type ballistic type, a spring charge type, a piezoelectric element drive type, etc. can get.

〔Effect of the invention〕

As is clear from the above description, the present invention solves the unevenness of output due to the difference in the bending moment statically received by the wire due to the difference in the arrangement of the levers and wires, by setting the core area of each. Adjust the suction force of the lever to the optimum value. This allows all wires to provide a constant output to the platen, thereby improving printing ability and ensuring high print quality.

[Brief explanation of the drawing]

1 and 2 are sectional views of embodiments of the present invention, respectively. Figure 3 is also a plan view. 4 and 5 are sectional views for explaining the present invention in detail, respectively. FIG. 6 is a plan view of the prior art. 1 ・ φ ・ 2 ・ ・ 3 ψ ・ ・ 4 φ ・ 5 Red ψ Kai 61 No. 7 ・ Φ Fist 9 ・ φ ・ 10～15 16 ・ ・ ・ 17 φ ・ ・ 18. Fist ・ 19 Fist ・ 20・ ・ ・ 21 Pot ・ ・ ・Core surface・Frame pot lever・Fulcrum shaft・Yoke plate A・Yoke plate B・Fulcrum spacer・Wire・Tip wire guide・Wire guide・Spring holder・Wire insertion hole・Wire insertion hole・Electromagnetic Coil/ribbon Φ platen 22, 23, 24, 25 fist, printing paper, wire insertion hole, wire insertion hole, damper Applicant Seiko Epson Corporation Representative Patent attorney Kizobe Suzuki (and 1 other person) Figure 1 Figure 6

Claims (1)

[Claims] The electromagnetic coil attracts the lever to which the wires are integrally connected toward the core, and the wires pop out.The coil spring causes the levers to return toward the damper, causing the wires to behave, and the wires form one or more rows at the tip. A wire dot head characterized in that the core area of each wire dot head is set by the arrangement of levers so that the behavior of all wires with respect to a platen is the same.