JPS6135262A - Dot printer - Google Patents

Abstract

PURPOSE:To attempt a reduction of a printing noise by forming at least either of a printing head frame, a fitting member, and a carriage with a vibration restraining alloy of the Al-Zn series containing Zn more than 40wt%. CONSTITUTION:The nose 15 formed by a die cast with a vibration restraining alloy of the Al-Zn series containing Zn more than 40wt% is provided on a platen side of the holding body holding a thing between thereof. The leaf spring 9 is disengaged from an end surface of the core 4 and acted toward a printing position, when an electric current is flowed in the coil 51, then, a magnetic force is generated in the core 4, and a magnetic flux of the permanent magnet 7 passing through the inside of the core 4 is eliminated. Thereby, the printing wire 10 is projected from the nose section 15 foreward, and strike a surface of the platen, and then the printing action is carried out. The leaf spring is collided against the core 4 by the magnetic flux of the permanent magnet 7 when a current supply to the coil 5 is stopped. Therefore, the printing head is vibrated by a collisions between the printing wire 10 and platen and between the leaf spring 9 and the core 4, but its vibration is attenuated by the nose section 15 formed of material having the vibration restraining effect, and the printing noise can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot printer equipped with a print head and a blade to which the print head is fixed.

[Prior Art] Conventionally, this scale device has a nose section that guides the printing wire,
The print head mounting part and the print head are directly attached (A1 dye l with small attenuation of the ridge %: pA1
- It was manufactured at.

[Problems to be Solved by the Invention] Therefore, during the printing operation, the entire printing head and carriage vibrate violently due to the impact of the printing wire on the platen and the collision between the armature and the core, and this vibration radiates noise. and was very noisy.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and provides a dot printer that can reduce vibration of the entire print head and carriage, thereby reducing printing noise. It is something to do.

[Means and effects for solving the problems] This invention has the following features:
In order to achieve the above object, at least one of the frame, mounting member, and carriage of the print head is made of an Al-Zn vibration damping alloy containing 40% by weight or more of Zn, so that vibrations generated during printing can be suppressed during printing. The print noise is attenuated by the head itself to reduce printing noise.

C Example 1 An example embodying the present invention will be described below with reference to the drawings.

A yoke 2 is formed protruding from the outer peripheral edge of an annular head base 1 made of a magnetic material, and a frontage 3 is provided in the center thereof. Inside the yoke 2, a plurality of cores 4 are arranged on the same circumference at equal intervals, and each core 4 and a coil 5 constitute an electromagnet 6.

An annular permanent magnet 7 is fixed to one end surface of the yaw 92 by its magnetic force, and an annular support member 8 made of a magnetic material is also fixed to one end surface of the permanent magnet 7 by the magnetic force. There is.

The disc-shaped leaf spring 9 has the same number of operating pieces 11 as the number of printing wires 10 radially directed toward the center of the circle.
A rib 12 is attached to the opposite side of the electromagnet 6 of No. 1, and a printing wire 1110 is further brazed to the tip of the actuating piece 11. The leaf spring 9 (5) is fixed between the supporting member 8 and the clamping body 13 with a screw 14J. On the platen (not shown) side of the clamping body 13, 40 m of Zn is applied.
A nose portion 15 is provided which is die-cast from an Al--Zn damping alloy containing at least m%.

The nose portion 15 has a plurality of positioning grooves 17 in one step for determining the position of the guide member 16 that guides the printing wire 10, and a tip guide 18 is provided at the tip thereof.

Such a print head is fixed to a carriage 20 with screws 21 via a nose portion 15 and an oval-shaped mounting body 19. The mounting body 19 and the nose portion 15 are fixed to the clamping body 13 with screws 22.

When a predetermined print signal is input to the print head configured in this way and the coil 5 is energized, a magnetic force is generated in the core 4, and the magnetic path of the permanent magnet 7 passing through the core 4 is canceled out. The leaf spring 9 is separated from one end surface of the core 4 by its spring force and is moved to the printing position. As a result, the printing wire 10 projects forward from the nose portion 15, and its tip hits the surface of the platen through an ink ribbon (not shown) and printing paper (not shown) to perform a printing operation. When the coil 5 is no longer energized, the magnetic path of the permanent magnet 7 causes the leaf spring 9 to almost collide with the core 4.Therefore, the print wire 10 collides with the platen, and the leaf spring 9 collides with the core 4, causing printing. Although the head (particularly the nose part 15) vibrates, the vibration is reduced by the nose part 1 made of a material that suppresses the vibration, so the printing noise radiated from there is reduced. It is reduced.

Next, the results of a printing noise test on a nose portion 15 formed by 117 strokes using Qosma I ZM-3, an Al-Zn-based vibration-damping alloy manufactured by Mitsubishi Metals Corporation, will be shown.

The material is navy blue or AI: 37.0-44. oz Fill %3
i: 2.25-4.00 Cu for Shigekawa: 0. γ0~
1.40fffffi%Mn 20.20 =0.4
5 weight 1111% Fc: 0,075% by weight or less Mg: 0.004% by weight or less Remaining amount Zn.

In addition, the measurement conditions are: Observation used: 24 bin head - 60 cps printer Measurement location: Anechoic chamber Measurement tel instrument: BeklS17ff meter Measurement position Same height as the nib platen, 1mm from the front of the printer cover Measurement pattern: 25% [)uty, full line printing with continuous 1/6 inch feed and line feed.

The measurement results are as follows: (1) Conventional...A1 die-casting of the nose part] Molding (
Material ADC12) L, 62.5d B, 65d B, 65.5d B
Average + 1fl == G4.3d [3(2) Present invention・
62dB, 61dB, 62dB average value = s1.The nose part was die-cast with Cosmal ZM-3. ydB, and compared to the conventional A1 die-cast product, the printing noise is 1. ! 1 to 4.5 d3 can be reduced, and the variation can be reduced. .

Furthermore, even when the wind cover is removed, the printing noise is reduced to 1~
2(jB) can be reduced.

And Al-Zn system 1 containing 40% by weight or more of Zn
III alloy has plasticity 1 at the interface between the Al layer and the In layer.
/I flow has large internal wear and absorbs vibration energy well, so it has extremely good vibration damping properties, and has 11 times higher rigidity, strength and thermal conductivity.

In the above embodiment, the Al--Zll damping alloy containing 40 ffiffi% of Zn was used only in the nose portion 15, but the effect will be even greater if it is also used in the mounting body 19. That is, the mounting body 19 is usually too large in rigidity.
! However, if the above-mentioned Δ1-Zn damping alloy is used here, the vibrations can be reduced and the Al Sound can be reduced.

It goes without saying that the carriage 20 may also be formed of the Al-7n damping alloy.
The vibrations of the print head are transmitted to the carriage 20, causing the surface of the carriage 20 itself to vibrate.

In particular, the carriage 20 has many thin parts in order to reduce its weight, and this vibration often radiates large g-sounds. Therefore, if the Al-Zn vibration damping alloy is used in these parts, vibrations can be reduced. can reduce noise.

[Effects of the Invention] As detailed above, the present invention is applicable to a dot printer in which a print head is fixed to a carriage by a mounting member.
Since at least one of the frame, mounting member, and carriage of the print head is made of an Al-Zll-based vibration damping alloy containing 40% by weight or more of Zn, the vibration of each of the parts that occurs during printing is reduced. Vibration can be reduced, and noise radiated therefrom can be reduced. In addition, there is no need for special parts or special structures to obtain the vibration damping effect, making it extremely inexpensive! A sound can be reduced. Furthermore, 4I can be made into a thin-walled structure and the weight of the print head and carriage can be reduced.
-The effect it had on Qin was extremely large.

[Brief explanation of the drawing]

The drawing is a sectional view of the print head of the dot printer of the present invention. . In the figure, 4 is a core, 6 is an electromagnet, 9 is a leaf spring, 10 is a printing wire, 11 is an actuation piece, 15 is a nose part (frame),
10 is a body, and 20 is a carriage.

Claims (1)

[Scope of Claims] 1. A plurality of electromagnetic devices supported on a frame, an operating member driven by each of the electromagnetic devices and having a printing wire fixed to its operating end, and a proximal end fixed to the frame. A dot printer, comprising: a print head comprising a leaf spring member having a free end connected to the actuating member; and a carriage to which the print head is fixed by a mounting member and reciprocates along printing lines of printing paper. A dot printer according to the present invention, wherein at least one of the frame, the mounting member, and the carriage of the print head is formed of an Al-Zn vibration damping alloy containing 40% by weight or more of Zn. 2. The nose part forming a part of the frame and guiding the printing wire is formed of an Al-Zn vibration damping alloy containing 40% by weight or more of Zn. The dot printer described in item 1. 3. The Al-Zn damping alloy is made of Al37.0-44
．． 0% by weight, Si2.25-4.00% by weight, Cu0.
70-1.40% by weight, Mn 0.20-0.45% by weight
, 0.075% by weight or less of Fe, 0.004% by weight or less of Mg, and a remaining amount of Zn.