JPS58173808A - Printing drive device - Google Patents

Abstract

PURPOSE:To perform high-speed printing, by a method wherein an armature and a leaf spring are formed as one body, and bent portion is formed at both side edges of the leaf spring serving as the armature and thereby forming a magnetic flux flowing surface. CONSTITUTION:When a coil 9 is not energized, i.e. at non-printing state, a leaf spring 10 is attracted to a core 2 by means of flux from a permanent magnet 3 and the elastic energy is stored. If the coil 9 is energized for printing command in this state, flux having reverse polarity to that of the permanent magnet 3 is generated in the core 2 and the magnetic force of the permanent magnet 3 is canceled thereby the leaf spring 10 is restored by the stored elastic energy and a wire 8 is moved towards a platen so as to perform printing. In this constitution, one leaf spring serves also as an armature thereby weight of the device is reduced by that corresponding to the armature and the high-speed printing can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print drive device, and more particularly to a print drive device that can be effectively applied to a wire dot printer.

An example of a conventional printing drive device of this type is shown in FIGS. 1 and 2.

In FIG. 1, the printing drive device, which is designated as a whole by reference numeral 1, includes a core 2 formed in a substantially L-shape, a yoke 4 connected to the core 2 via a permanent magnet 3 fixed to one end of the core 2, and a yoke 4 connected to the core 2 via a permanent magnet 3 fixed to one end of the core 2. A side core 5 is provided which is continuous to the side core 5, and one end of a leaf spring 6 is fixed to the joint surface between the yoke 4 and the side yoke 5. One end of an armature 7 is fixed to the free end side of this leaf spring 6, and the other end of the armature 7 (the base end of a wire 8 is fixed to the second end). is wound with a coil 9.

In such a structure, the magnetic flux from the permanent magnet 3 passes through the core 2 and acts to attract the armature 7 against the volatile force of the leaf spring 6, and the magnetic flux from the permanent magnet 3 acts to attract the armature 7 against the volatile force of the leaf spring 6. The armature 7 is attracted to the core 2, and the leaf spring force is in a state C- where elastic energy is accumulated.In this state,
When current is supplied to the coil 9 by a printing command from a control circuit (not shown), the generated magnetic flux has a polarity opposite to that of the permanent magnet 3, so it cancels out the magnetic force of the permanent magnet 3, and this Therefore, the armature 7 moves in the direction C2 away from the core 2 by releasing the elastic energy of the leaf spring 6, and the wire 8 moves toward the platen (not shown) to perform printing.

However, when such a structure is adopted, in order to increase the attraction force due to the magnetic flux from the permanent magnet 3, this magnetic flux is guided through the side yoke 5, and as shown in FIG. A structure is adopted in which the armature 7 has a
, the mass of the entire movable part consisting of the leaf spring 6 and the wire 8 becomes large, and a large inertial force acts on it.
It was difficult to increase the speed.

Further, as shown in FIG. 2, a leaf spring 6. Armature 7
It is necessary to fix the wires 8 and 8 with a predetermined precision, which has the drawback of increasing the cost.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional apparatus, and an object of the present invention is to provide a printing drive device that can perform high-speed printing with an extremely simple structure and can be manufactured at low cost. .

In order to achieve the above-mentioned purpose, we integrated the armature and leaf spring into one body, provided two bent parts on both sides of the leaf spring that also served as the armature, and A structure with inflow and outflow surfaces was adopted.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figures 3 and 4 illustrate one embodiment of the present invention.
In the figure, the same parts as in Figures 1 and 2 are given the same reference numerals.
The explanation will be omitted.

In this embodiment, a leaf spring 10 in which the leaf spring and armature of Conventional Example I are integrated is used. This leaf spring 10 has one end fixed between the yoke 4 and the side yoke 5, and the other end passed through the end of the side yoke 5, which has a U-shaped cross section f2 (see Fig. 5). I'm leading you in the direction. In the middle of this leaf spring 10, both side edges 1 of the portion facing the core 2 and the side yokes 5 have a fifth
As shown in the enlarged view, bent portions 10a, 10a are formed which are bent upward at right angles, and these are fitted into the U-shaped portion at the tip of the side yoke 5, as shown in FIG. Ru. Since these bent portions 10a, 10a serve as surfaces for the inflow and outflow of magnetic flux from the side yoke 5, there must be a gap between them and the side yoke 5 that is large enough to prevent the two from interfering with each other during operation. .

A plate 1 that also serves as an armature and has such a structure
The proximal end of the wire 8 is fixed to the distal end of the wire 8.

Next, the operation of this embodiment having the above I-configuration will be explained.

When the coil 9 is not energized, that is, when not printing, the leaf spring 10 is in a state C2 where the magnetic flux from the permanent magnet 3 (2) is attracted to the core 2C and its elastic energy is accumulated. , the magnetic flux from the permanent magnet 3 is transmitted to the core 2, the side yoke 5, the bent portion 10a of the leaf spring 10,
10a and core 2. This state is shown in FIG. 5 (-arrow).

From this state, core 2C - attached coil 9C
When the second printing command is energized, a magnetic flux having a polarity opposite to that of the permanent magnet 3 is generated in the core 2, and in order to cancel the magnetic force of the permanent magnet 3, the leaf spring 10 is activated by the accumulated elastic energy (restored from the second Then, the wire 8 moves toward a platen (not shown), and printing is performed.

Since this embodiment is constructed as described above, there is no need for a yoke that requires a predetermined thickness as in the past, and a single plate spring also serves as the armature, so the armature is smaller than the conventional one. Since it is lighter and has less inertia, high-speed printing is possible.Furthermore, the armature, which is a separate part, can be removed, allowing the armature to be joined with the wire and leaf spring to a specified dimensional accuracy. This eliminates the need for any work processes, and reduces costs.

Note that, when the leaf spring 10 operates, the elastic energy of the leaf spring 10 is generated between the side yoke 5 and the bent portions 10a, 10a, which serve as magnetic flux inflow and outflow surfaces between the side yoke 5 and the leaf spring 10. A certain gap is required to avoid loss of magnetic field, and this gap length must be minimized to reduce magnetic resistance. For this reason, if a conventional structure was adopted in which the two-plate spring and armature were joined, a gap length that was longer than necessary had to be provided due to the accuracy of the fixing position, but in the present invention, such considerations are completely eliminated. This is not necessary and can provide extremely high precision in gap length.

By the way, FIG. 6 explains another embodiment of the present invention. In this embodiment, a plurality of the above-mentioned leaf springs 10 are arranged radially, and the free ends of the springs 10 and 10 are arranged centripetally from the ring 11. It is configured as an extended integrated printhead.

Adopting such an integrated structure eliminates the process of accurately positioning and fixing the armature relative to the leaf spring, and also makes it extremely easy to use press processing.
Since it is possible to manufacture two printheads, there is an excellent effect that a print head having a plurality of movable parts can be manufactured with extremely high precision and at low cost.

As is clear from the above description, according to the present invention C-,
The armature and leaf spring are integrated into a single leaf spring, and a structure is adopted in which bends are formed on both sides of the leaf spring midway to serve as magnetic flux inflow and outflow surfaces, reducing the number of parts. It is possible to realize a high-precision assembly structure by reducing the number of parts, and achieve the excellent effect of achieving a significant cost reduction.

[Brief explanation of the drawing]

1 and 2 illustrate a conventional structure. FIG. 1 is a side view, FIG. 2 is an enlarged perspective view of an armature portion, and FIGS. 3 to 5 illustrate an embodiment of the present invention. The figure is a plan view of a print head illustrating another embodiment of the present invention. 1... Printing drive device 2... Core 3... Permanent magnet 4... Yoke 5... Side yoke
8... Wire 9... Coil 10
...Plate spring 10a...Bent part 11!1 Figure 5

Claims (1)

[Claims] In a printing drive device that performs printing by driving a printing wire through an elastically supported armature by energizing a coil wound around a core, a part of the armature is bent, and this bent portion is used as a magnetic path. A printing drive device characterized in that it is a part of.