JPH0410863B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention uses a printing head used in a dot-type wire printer, and in particular, uses a large number of arranged printing wires to print characters such as Kanji at high speed and with high precision. This invention relates to a print head for a dot printer configured to print.

Conventional configurations and their problems In recent years, advances in computers and peripheral technology have led to advances in information processing by computers, and
In the field of automation, there is a growing need for kanji information processing that takes advantage of the easy-to-read and easy-to-understand characteristics of Japanese. Along with this, various printers are being developed, and among these printers, wire dot printers that can print on various types of paper and are inexpensive are rapidly developing. Therefore, a wire dot printing head for Kanji printers has been developed in which a plurality of printing wires and driving elements are arranged as a printing head for dot printers, and measures such as higher speed, smaller size, and lower noise are desired.

Therefore, by using a spring-charge type printing wire drive movable part with a driving spring member attached perpendicularly to the armature, characters can be printed at high speed and with high precision, and the movable part can print hundreds of millions of dots. A durable movable part for a dot printer print head has been proposed.

Hereinafter, the above-mentioned conventional movable part will be explained using FIG. 1.

In FIG. 1, reference numeral 1 denotes a driving vertical spring member, one end of which is attached to a spring holder 2, the other end of which is attached to an armature 5 to which a printing wire movable part (printing wire 3, spine 4) is attached. The driving vertical spring member 1 with respect to the movable direction
are arranged so that the direction of deflection is approximately at right angles. The center of rotation A of the vertical spring member 1 is the length a of the spring from the position where the armature is attached to the spring member to the center of rotation, and the length of the spring from the position where the spring member is attached to the spring holder 2 to the center of rotation. The structure is such that the rotation center A is located on a straight line of the armature suction surface 6a of the core portion 6 constituting the magnetic circuit.

In addition, in order that the armature suction surface 6a of the magnetic circuit core portion constituting the print head and the armature suction surface 5 are in uniform plane contact in the attracted state, the two formed by the armature suction surface 5a and the core suction surface 6a are The plane is configured to have a predetermined angle B (depending on the stroke size) in the open state.

When using the above movable part configured in this way, the center of rotation of the printing wire drive part can be set on the spring attachment position, and the weight of the armature can be adjusted vertically because the armature is directly attached to the vertical spring member. Since it is provided near the spring member, it is possible to increase the printing speed without tearing the ink ribbon, paper, etc.

However, in order for a movable part using a vertical spring member to satisfy the various conditions mentioned above, it is necessary to accurately assemble the mounting position of the vertical spring member and spring holder, the positional relationship between the armature and the core, and the gap setting. It is very difficult to accurately set the position by simply using the spring holder 2 having the shape shown in FIG. In addition, since the print head is an array of many movable parts for dot printer print heads, it is necessary to suppress variations in the position settings of each movable part in order to uniformize the printing condition of each print pin. Regarding the problem, it was impossible to solve the problem by using the spring holder 2 shown in FIG. 1 above.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a movable part for a print head of a dot printer that improves the assembly dimensional accuracy of the movable part and at the same time makes it possible to easily produce a movable part with little variation. The purpose is to provide

Structure of the Invention In order to achieve the above object, the present invention includes a movable arm to which a printing wire is attached, a armature to which the movable arm is attached, and a armature arranged such that the direction of deflection is approximately perpendicular to the movable direction of the armature. and a spring holder that has a recess into which the drive spring member is fitted to a predetermined depth and that is fixed to an outer peripheral core that is continuous with the core part with screws. The surface and the contact surface between the armature and the core portion are arranged to be substantially in the same plane.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of the print head for a dot printer according to the present invention, and particularly shows the shape of the spring holder of the movable part.

That is, in FIG. 2, a horizontal spring member 10 is provided at a substantially right angle to the vertical spring member 1 in a movable part constructed using a vertical spring member 1, thereby reducing the longitudinal and lateral vibrations generated in the armature 5. This figure shows the shape of a spring holder for the movable part of the print head of a dot printer, which aims to suppress the printing head.

In the same figure, the spring holder 11 has a two-stage concave portion, and the base of the spring member 10 in the horizontal direction is regulated by the height and width of one end 11c of the upper surface of the spring holder recess. The end 11b is attached to the outer core 9 with screws 8. In this embodiment, by inserting the vertical spring member 1 into the second stage recess 11a provided inside the spring holder 11, the positional relationship between the vertical spring member 1 and the horizontal spring member 10 and the relationship between the armature 5 and the core 6 are adjusted. The positional relationship and gap B are regulated, and the required assembly precision of the movable parts can be easily obtained. Furthermore, since the mounting surface of the spring holder 11 and the contact surface between the armature 5 and the core section 6 are substantially in the same plane, the surface of the core section can be easily exposed, and the assembly precision can be further improved.

Effects of the Invention As explained above, the present invention uses a spring holder with a recess formed therein, thereby improving the assembly dimensional accuracy of the movable part and at the same time making it possible to easily produce a movable part with little variation. Therefore, it is possible to obtain a movable part for a print head of a dot printer at a low cost, which is capable of printing characters at high speed and with high accuracy, and is intended to improve the mass productivity and reliability of the print head. Furthermore, since the spring holder mounting surface and the contact surface between the armature and the core portion are substantially in the same plane, assembly accuracy is further improved.

[Brief explanation of drawings]

FIG. 1 is a structural sectional view showing the shape of a conventional movable part and a spring holder, and FIG. 2 is a structural sectional view showing the shape of a spring holder according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Vertical spring member for driving, 2... Spring holder, 3... Printing wire, 4... Spine, 5... Armature, 6... Core part, 7... Spring holder, 8
... Screw, 9 ... Outer core, 10 ... Horizontal spring member, 11 ... Spring holder.

Claims (1)

[Scope of Claims] 1. A movable arm to which a printing wire is attached, an armature to which the movable arm is attached, and a drive spring member disposed so that its deflection direction is approximately perpendicular to the direction of movement of the armature. , a spring holder having a recess into which the driving spring member is fitted to a predetermined depth and fixed to an outer circumferential core continuous with the core portion with a screw; a mounting surface of the spring holder, the armature, and the spring holder; 1. A print head for a wire dot printer, characterized in that a contact surface with a core portion is substantially in the same plane.