JPS60145859A - Impact head device - Google Patents

Abstract

PURPOSE:To decrease noise and consumption of electricity with a simple and economical means by providing an elastic member in the rear of a leaf spring of an impact head device. CONSTITUTION:A movable iron core 3 is attracted to a fixed iron core 8 against a spring force of a leaf spring 2 by a magnetic force of a permanent magnet 7. At the time of printing by supplying a coil 10 with electricity the attraction force of the permanent magnet 7 is weakened and the movable iron core 3 is released and a hammer 1 hits a platen 11 by the spring force of the leaf spring 2. Subsequently, if the feeding of the electricity to the coil 10 is suspended, the permanent magnet 7 attracts the movable iron core 3 towards the fixed iron core 9 and the hammer 1 is pulled back from the platen 11 and the tip of an arm 2a of the leaf spring 2 is brought into contact with a silencer member 6 made of elastic material on a front board 5. By the above the descending speed of the iron core 3 is decreased. Further, by being attracted by the fixed iron core 9 and after descending and landing, and by being brought into contact of the arm 2a with the silencer member 6, and by elastic deformation and deflection of the leaf spring 2, the speed of the cores 3 to 9 at the time of an impact is decreased, resulting in the decrease of the impact noise.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an impact head device, and particularly to a spring-charged impact head device.

[Prior art]

In recent years, printing or recording devices have become popular in various places such as offices and homes as peripheral devices for personal computers and the like. Therefore, quietness has become particularly important as a performance of such devices.

Among them, impact printers are superior in terms of printing speed, but conventional devices have the disadvantage of being louder than other printers. In particular, with spring-charged impact printers, the movable core of the electromagnet is attracted and released, and the hammer is brought into contact with the recording paper via the ink ribbon to record dots, so the impact noise of the core during suction can be audible. It accounts for most of the noise.

〔the purpose〕

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide an impact head device with low noise and low power consumption by simple and inexpensive means.

〔Example〕

The present invention will be described in detail below based on the embodiment shown in the drawings.

The spring-charged dot impact head of the present invention shown in FIG. A head with four hammers is shown here so that four dots can be formed at one time. The four hammers 1 are provided at the tips of four arms 2a formed by cutting out the leaf spring 2.

The arm 2a has a hole 2b on the outside of each hammer 1, and a movable iron core 3 is attached to the hole 2b.

The leaf spring 2 is attached to the front plate 5 with a spacer 4 in between. Holes 5a are provided in the front plate 5 at corresponding positions so that the four movable iron cores can slide therethrough.

Further, a sound deadening member 6 made of an elastic material is fixed to the center of the front plate 5a.

This sound deadening member 6 is, for example, a rectangular substrate as shown]
Second, a trapezoidal protrusion is formed to receive the tip of the arm 2a of the temporary pie 2.

Each of the above-mentioned members is further laminated and fixed to the collar portion of the yoke 8 via a ring-shaped permanent magnet 7.

The yoke 8 is formed like a forest-like container, and inside it there are four fixed cores 9 at positions corresponding to the movable core 3.
is provided.

In the dot impact head constructed as shown below, the permanent magnet 7 is polarized in the vertical direction in the figure, and the front plate 5,
A magnetic path is formed by the movable core 3, the fixed core 9, and the yoke 8, and the movable core 3 is always attracted to the fixed core 8 by the magnetic force of the permanent magnet 7 against the spring force of the leaf spring 2.

During printing, the coil 10 is energized to generate a magnetic field in the opposite direction to that generated by the permanent magnet 7 in the magnetic path, thereby weakening the attractive force of the permanent magnet 7. As a result, the repulsive force of the leaf spring 2 (arm 2.a) releases the movable core 3, causing the hammer 1 to fly upward in FIG. Do the following.

Thereafter, when the coil 10 is de-energized, the movable iron core 3 is again attracted to the fixed iron core 9 by the attractive force of the permanent magnet 7. In the past, the iron cores collided rapidly with each other at this time, producing a high-pitched metallic sound, but in the present invention, the tip of the plate pie 2 first comes into contact with the elastic sound-deadening member 6, thereby causing the plate spring 2 and the front end to contact each other. The impact noise generated by the plate 5 is reduced, and the collision speed of the movable iron core 3 is further reduced due to the deflection of the plate 2, thereby reducing the impact noise generated between the iron cores 3 and 9.

This operation will be explained below with reference to FIGS. 2 to 4. 2-4 show cross-sectional views of the dot-in-notch head of FIG. 1. FIG. 2 shows the state at the time of printing completion Y when the iron core 3 is released, and the hammer 1 collides with the platen 11 with the force of the platen 2.

Next, when the coil 10 is de-energized, the permanent magnet 7 is +-iJ
The moving iron core 3 is attracted to the fixed iron core 9), and the hammer 1 is pulled back from the platen 11. As shown in FIG. 3, first, the tip of the arm 2a of the board 2 is brought into contact with the sound deadening member 6 of the 111J board 5'2. As a result, the descending speed of the +iJ dynamic iron core 3 is reduced. Of course, the contact sound between the sound deadening member 6 and the pie board 2 is very small because the sound deadening member 6 is made of an elastic material.

When the movable iron core 3 is further pulled down by the fixed iron core 9,
It lands on the fixed iron core 9 as shown in FIG. Due to the contact between the arm 2a and the sound deadening member 6, the elastic deformation of the sound deadening member 6, and the deflection of the leaf spring 2, the speed at the time of collision of the iron cores 3 and 9 is reduced, thereby reducing the impact noise generated. I can do it.

In the manner described above, the impact noise after the recording sheet is formed can be reduced, and the operational noise can be significantly reduced.

Further, according to the embodiments described above, the driving current of the coil 10 during printing can be reduced, and the consumption type J can be reduced. This situation can be seen in Chapter 5.
This will be explained using figures.

In FIG. 5, the vertical axis shows the suction opening of the leaf spring or permanent magnet, and the horizontal axis shows the change over time of the gap between the +if moving iron core 3 and the fixed iron core 9 during operation, that is, the position of the moving iron core 3. There is. In the same figure, what is indicated by the symbol P is the attraction force by the permanent magnet 7 corresponding to the gap change, and the symbols Ql and Q.
2 is the repulsive force of the leaf spring 2. Also, A
The positions of point to point C are the movable iron core 3 in FIGS. 2 to 4, respectively.
corresponds to the position of

Conventionally, at the start of recording, the leaf spring 2 is
Since it was supported at one point by a fulcrum on the outer periphery, the spring force did not change at the time indicated by the symbol B, and the repulsive force characteristics were as shown by a straight line extending the straight line Q2 with a broken line. As a result, in the past, in order to move the movable core 3 forward against the 1 attraction force P of the permanent magnet 7, it was necessary to apply a force greater than that indicated by the symbol E by the coil IO at the start of the operation at the 0 point. .

On the other hand, in the present invention, at the time point B, the arm 2 of the leaf spring 2
Until a separates from the muffling part 446, the leaf spring 2 is supported at two points by the muffling member 6 and the spacer 4.
It functions as a short spring, and its repulsive force increases along the curve of the attractive force P of the permanent magnet 7, as indicated by Q1. Therefore, in the present invention, only the force corresponding to the difference between the attractive force of the permanent magnet 7 and the repulsive force of the leaf spring 2 is applied to the coil 10 at the 0 point.
It is sufficient to give it by Therefore, the difference in the attractive forces of the large magnets is the actual attractive force for power consumption during recording, and in the present invention, as shown in FIG. It becomes slower and the impact sound becomes smaller.

Although a dot impact head has been described above as an example, the present invention can of course be applied to an impact head such as a daisy wheel that records by striking type from the back side. In this case, only one hammer is required, and the type is struck from the back side by this hammer, and recording is performed via the ink ribbon.

〔effect〕

As is clear from the above description, according to the present invention, a configuration is adopted in which the plate spring to which the hammer is attached is supported at two points by the sound-damping member made of an elastic body and the plate pie/support member. This makes it possible to provide an excellent impact head device with low operating noise and low power consumption due to its simple and inexpensive configuration.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the dot impact head of the present invention, Figs. 2, 3, and 4 are sectional views showing the dot impact head of Fig. 1 in the order of operation, and Fig. 5 is the dot impact head of the present invention. FIG. 3 is a diagram illustrating the operation of the head. 1...hammer 2-9-plate spring 3°°° movable iron c- 4...nube 4-no. 5... Front plate 6... Sound deadening part] A 7... Permanent magnet 8... Yoke 9... Fixed core 10... Coil 11... Platen patent applicant Canon Electronics Co., Ltd. agent Patent attorney Takashi Kato

Claims (2)

[Claims] (1) In an impact head device in which the recording operation of the recording hammer is performed by the repulsive force of the band member and the recording hammer is returned to its initial position by magnetic means, a Kokichi is provided with five elastic members behind the leaf spring. Impact head device with special features. (2) The impact head device according to claim 1, wherein at the initial position of the recording hammer, the plate pie is supported at two points by an mJ recording elastic member and a fulcrum of the plate pie. .