JPH0499648A - Dot type printing head - Google Patents

Abstract

PURPOSE:To increase an operating distance of printing wires without reducing a printing speed by mounting the wires each bent at its ends in an L shape at a plurality of rectangular leaf springs arranged radially, and hitting the spring by an armature to print. CONSTITUTION:Printing wires 1 are radially arranged, and rectangular leaf springs 2 are integrally mounted. The wire 1 is bent at its center toward an outside to form a printing end. When a coil 8 is energized, a magnetic attraction force of a magnet 6 is cancelled, an armature 3 is elastically actuated by strain energy stored in a leaf spring 4 for the armature to press the spring 2, and the wire 1 secured to the spring 2 is flown out together with the spring 2 to the side of a platen 14 to hit a printing sheet 13 by its end to print it.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot-type print head device used in a dot impact printer.

[Conventional technology]

Conventionally, in this type of print head, a print wire is directly fixed to an armature, the armature is driven by magnetic attraction force and spring force, and the print wire hits the print paper via an ink ribbon to print. The majority of methods are

[Problem to be solved by the invention]

In the conventional print head mentioned above, since the print wire is directly attached to the armature, it is difficult to increase the operating distance of the print wire, and it is difficult to print on paper of varying thickness, such as bankbooks and tank paper. However, there are disadvantages in that it is not possible to do this, and the position of the print head must be adjusted depending on the thickness of the paper.

As a countermeasure against this problem, there is also a free-flight type print head in which a button is provided at the end of the print wire on the armature side, and printing is performed by hitting the button with the armature and flying only the wire. However, this method has the disadvantage that printing speed cannot be increased due to restrictions on the mass of the wire, the return spring, and the stopper.

Additionally, since the armature and print wire are fixed as one unit, if the tip of the print wire wears out due to long-term printing, it will reach the end of its lifespan, and the wear of the print wire will limit the lifespan of the print head. Ta.

[Purpose of the invention]

In consideration of the drawbacks of the conventional example, the present invention adopts a structure in which the tip of the bent print wire is struck by an armature. The purpose of this invention is to provide a dot device for dot-type printing that makes it possible to set a large reciprocating stroke.

[Means for solving problems]

In the present invention, a plurality of printed wires are arranged radially on the same plane. A strip-shaped leaf spring is integrally provided along each printed wire. A printing tip portion is formed by fixing the outer peripheral end portion of each print wire to the case body together with a strip-shaped leaf spring, and bending the center portion of each print wire outward. A wire drive mechanism is installed inside the center of each print wire to urge each print wire to rotate its tip along the bending direction. This aims to achieve the above-mentioned purpose.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the embodiment shown in FIGS. 1 to 3, first, a plurality of printed wires 1 are arranged radially on the same surface. Along each printed wire 1, a strip-shaped leaf spring 2 as a hammer spring is integrally provided for each printed wire 1. The outer peripheral end portion of each printed wire 1 is fixed to the case body 20 together with the strip-shaped leaf spring 2. The central portion of each print wire 1 is bent outward, thereby forming a printing tip. Furthermore, a wire drive mechanism 31 that urges each print wire 1 to undulate and rotate its tip along the bending direction is provided inside the center of each print wire.

To explain this in more detail, in this embodiment, the print wire 1 is formed of a hollow vibrator-like member. The printed wire 1 made of a hollow vibrator has an L-shaped tip and is fixed to a strip-shaped leaf spring 2 as a hammer spring, which is disk-shaped and has a plurality of radial slits leaving the outer periphery. and the other end with the ink vibrator 10
is connected to.

As shown in FIGS. 1 and 2, the strip-shaped leaf spring 2 has its outer periphery fixed, and behind it has a board that has almost the same shape as the strip-shaped leaf spring 2 and is thicker than the strip-shaped leaf spring. It has an armature plate spring 4 whose outer periphery is fixed, and an armature 3 is fixed to this armature spring 4. Further, behind it, there is a side magnetic path 5 which forms a magnetic circuit, that is, an electromagnetic drive section 30, for attracting the armature 3 to the yoke 7 side by magnetic attraction force against the force of the armature plate spring 4. A magnet 6, a yoke 7, and a coil 8 for canceling the magnetic attraction force of the magnet 6 are each equipped. This electromagnetic drive unit 30, the armature 3 and the armature leaf spring 4 described above make up the wire drive mechanism 3.
1 is formed. Further, the inner peripheral portion of the yoke 7 is cylindrical, and a stopper 9 is provided on the strip-shaped leaf spring 2 side.

On the other hand, the ink pipes 10 connected to the plurality of print wires are combined into one and connected to the rear ink tank 11, and the ink 12 inside is supplied to the L-shaped bent tip of the print wire 1. ing. The ink pipe 10 and the ink tank 11 form an ink replenishing means 32.

In addition, by removing the screw 14 shown in FIG.
The hammer part and the drive part are separated to the left and right from the joining position shown in the figure.

Next, the operation of the above embodiment will be explained.

During normal non-printing, the armature 3 is attracted toward the yoke 7 by the magnetic flux of the magnet 6 while bending the armature plate spring 4. The strip-shaped leaf spring 2 is a stopper 9
remains in contact with. When the coil 8 is energized, the magnetic attraction force by the magnet 6 is canceled out,
Due to the strain energy stored in the armature leaf spring 4, the armature 3 springs and pushes the strip-shaped leaf spring 2, and the printed wire 1 fixed to the strip-shaped leaf spring 2 moves to the platen 14 side together with the strip-shaped leaf spring 2. Printing is performed by popping out and hitting the printing paper 13 with the tip. Thereafter, the strip-shaped leaf spring 2 returns to the armature 3 side due to its springiness, collides with the stopper 9, and comes to rest. Further, after the armature 3 has pushed out the strip-shaped leaf spring 2, when the coil 8 is de-energized, it is again attracted to the yoke 7 by the magnetic attraction force, and returns to the initial state.

In the printing operation described above, the print wire 1 made of a hollow vibrator is supplied with ink 12 from the ink tank 11 at the rear, so there is no need for an ink ribbon like in the past, and the print wire 1 can be printed with small kinetic energy. Clear printing can be obtained.

On the other hand, the ink tank 11 is installed at a height where the water level of the ink 12 inside it almost matches the tips of the plurality of print wires 1, and therefore, due to the surface tension and capillary phenomenon of the ink, the print wires can remain even if left for a long time. 1 or backflow to the ink tank 11 side.

As described above, in this embodiment, a printed wire with an L-shaped tip is attached to a plurality of strip-shaped leaf springs whose outer peripheral parts are integrated and arranged radially, and these leaf springs are connected to a magnetic circuit. Since printing is performed by striking with an armature driven by a wire drive mechanism consisting of a spring, it is possible to quickly return the print wire to its original position by the action of the strip-shaped leaf spring. The operating distance of the print wire can be increased without reducing the printing speed, making it possible to print on paper with varying thicknesses, such as bankbooks, and even when changing to paper with a different thickness, the print head will It is possible to obtain a dont-type print head device that can be used without changing its position, has excellent operability, and has good print quality.

In addition, by making the print wire 1 with a hollow vibrator and supplying ink from the ink tank 11 through the ink pipe 10, clear printing is possible with low energy without the need for an ink ribbon, and it is possible to achieve high copying performance with low power. We can provide excellent printers. By making sure that the ink level in the ink tank 11 and the print wire 1 tip position are approximately at the same height, there will be no stains due to ink leakage or printing force scratches due to backflow of ink even if left for a long time. We can provide printers with excellent performance.

On the other hand, by providing a stone bar that prevents vibration during the return operation of the strip-shaped leaf spring 2 to which the print wire 1 is fixed, provided inside the armature collision part, printing operation is stabilized and a print head capable of high-speed printing can be provided.

Another effect is that by simply removing a few screws, it can be divided into a hammer part containing the printed wire 1 and the strip-shaped leaf spring 2, and an electromagnetic drive part 30 having a magnetic circuit including an armature. Since the hammer part can be removed without disassembling the circuit, even if the print wire 1 is worn out due to long-time printing, it can be easily replaced, and a printer with excellent maintainability that can also change the dot pitch can be provided.

In the above embodiment, the print wire 1 is formed from a hollow wire member, but it is also possible to form the print wire 1 from a solid ordinary wire member and print on a predetermined paper using an ink ribbon. This configuration may also be used.

[Effects of the Invention] As explained above, according to the present invention, a plurality of strip-shaped leaf springs whose outer peripheral portions are integrated and arranged radially have their tips L.
A print wire bent into a letter shape is attached, and this leaf spring is struck by an armature driven by a wire drive mechanism consisting of a magnetic circuit and a spring to print. This makes it possible to quickly return to the original position, and as a result, the operating distance of the print wire can be increased without reducing printing speed, making it possible to print on things such as bankbooks that vary in thickness. Furthermore, even when paper having a different thickness is used, it can be used without changing the position of the print wire, and a dot-type print head device with excellent operability and good print quality can be provided.

In addition, by making the print wire with a hollow pipe and supplying ink from the ink tank with the ink pipe, it is possible to print clearly with low energy consumption without the need for an ink ribbon, making it a low-power printer with excellent copying ability. can be provided. If the ink level in the ink tank and the position of the print wire tip are approximately the same height, the printer will have excellent reliability with no stains due to ink leakage or print force scratches due to ink backflow even if left for a long time. A dot printhead device can be provided.

2 is a longitudinal sectional view of FIG. 1, and FIG. 3 is an explanatory diagram showing the printed wire and strip-shaped leaf spring according to FIG. 1.

l... Printed wire, 2... Strip-like leaf spring as a hammer spring, 3... Armature, 4... Leaf spring for armature, 5.
...Side magnetic path, 6...Macnet, 7...
... Yoke, 8 ... Coil, 9 ...
・Stroke 7pa, 10...Ink pipe, 11・
...Ink tank, 12 ...Ink, 1
3...Print paper, 14...Platen,
20...Case body, 30...Electromagnetic drive unit, 31...Wire drive mechanism, 32...
...Ink replenishment means.

Applicant: Nippon Electric Co., Ltd. Agent: Patent attorney, Isamu Takahashi

[Brief explanation of drawings]

FIG. 1 is a partially cutaway diagram showing one embodiment of the present invention. figure (6 pulls rL1) No. figure

Claims (6)

[Claims] (1) A plurality of printed wires are arranged radially on the same surface, and a strip-shaped leaf spring is integrally provided along each of the printed wires, and the outer peripheral end of each of the printed wires. The printed wire is fixed to the case body together with the strip-shaped plate spring, and the central portion of each print wire is bent outward to form a printing tip, and the tip of each print wire is fixed to the case body. 1. A dot-type print head device, characterized in that a wire drive mechanism for urging up and down rotation along the bending direction of each print wire is provided in an inner portion of the central portion of each of the print wires. (2) The dot-type print head device according to claim 1, wherein each of the print wires is formed of a wire made of an ordinary solid member. (3) Each of the print wires is formed of a hollow pipe-shaped wire, and an ink replenishing means is connected to an outer peripheral end portion of each of the wires.
Dot print head device as described. (4) The water level of ink in an ink tank forming a part of the ink replenishing means is set to approximately the same height as the tip of each print wire.
Dot print head device as described. (5) The dot-type print head device according to claim 1, 2, 3, or 4, wherein the strip-shaped leaf spring is formed from a disc-shaped spring member whose outer peripheral portion is integrated. . (6) The wire drive mechanism includes an armature disposed corresponding to a strip-shaped leaf spring portion near the wire tip, and an armature that supports this armature and is attached to the armature along the printing direction of the wire tip. Claims 1, 2, and 3 are characterized by comprising: an armature plate spring that applies a pressing force; and an electromagnetic drive unit that attracts the armature against the pressing force of the armature plate spring.
, 4 or 5. The dot-type print head device according to .