JPH0447928Y2 - - Google Patents

Description

[Detailed description of the device] [General use] A plunger magnet that strikes an object by the reciprocating motion (piston motion) of a mover, in which the head at the tip of the mover comes into contact with the object. It is equipped with a buffer member that absorbs the impact force upon contact.

[Industrial application field]

The present invention relates to a plunger magnet, and more particularly, to a plunger magnet that can apply an excessive impact force when hitting an object by forward movement of a movable element, such as when hitting a key on a keyboard.

A plunger magnet is used, for example, in a key-pressing device for pressing keys 10 arranged on a keyboard 7, as shown in FIG. Then, for example, an operation test is performed on the keyboard 7 and the main body device (data processing device) not shown.

In the example shown in FIG. 2, a plurality of plunger magnets 1, 1, . . . are attached to the base substrate 8, etc., corresponding to the arrangement position of the key 10 to be pressed.
It goes without saying that this substrate 8 is movably supported by an arm or the like (not shown).

[Problems that conventional technology and ideas try to solve]

In this way, when hitting an object to be hit (object) such as a key, it is necessary to take into account that the impact force does not have an adverse effect on the object to be hit.

Taking the above-mentioned keying device as an example, the plunger magnet has a head (plunger head) 9 made of rubber or plastic formed at the tip of its movable element (movable core). Therefore, an impact force corresponding to the stroke length of the movable element and the excitation force of the plunger body example is directly applied to the keyboard 7 via the keys 10.

The pressing force of the key top is around 100grf, which is sufficient. For this reason, the excessive impact force of the plunger magnet 1 often causes the keyboard 7 itself to move (displace).

For this reason, it was necessary to set the relative distance between the key top surface of each key 10 of the keyboard 7 and the tip surface of each plunger head 9 of the keying device or the substrate 8 with greater precision.

Also, even if you set the distance like this,
The impact force when the plunger head 9 collides with the key 10 cannot be adjusted, and there is a problem in that an extra pressing force acts on the key 10 itself.

[Means for solving problems]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a plunger magnet that can apply optimal impact (pressing) force to an object to be hit.

FIG. 1 is a diagram explaining the principle of the present invention.

In the figure, 2 is the plunger magnet body;
3 is a movable element, 4 is a housing, 5 is a striking head, and 6 is a buffer member.

The movable element 3 reciprocates in a predetermined direction (left and right directions in the figure) with respect to the main body 2. In the present invention, a buffer member such as a spring is interposed between the movable element 3 and the head 5. One end of the housing 4 is movable in the axial direction of the movable element 3, and the other end is fixed to the head 5.

[Effect]

As shown in FIG. 1, a striking head 5 is provided at the tip of the movable element 3 with a buffer member 6 interposed therebetween. Therefore, the impact force of the movable element 3 can be absorbed by the member 6. Furthermore, by appropriately setting the damping ratio of the member 6, the substantial impact force generated on the head 5 can be adjusted as desired.

Hereinafter, the present invention will be described in detail with reference to the drawings.

〔Example〕

FIG. 3 is a diagram showing an embodiment in which the present invention is applied to a plunger magnet for keystrokes. Fourth
Figures a and b are diagrams showing the operating state of the embodiment.

Common parts in both figures are given the same reference numerals.

In the figure, reference numeral 11 denotes a plunger head (keying head), which is made of a material (such as plastic) that will not damage the key top surface. 12 is a spring pen, which fixes the head 11 to the other end of the cylindrical housing 14. 13 is a buffer spring, 14 is a housing, one end of which fits into the tip of the mover (iron core) 6, and the other end of which is fitted with the head 11.
It is something that fixes.

15 is a slider, 16 is an iron core, 17 is a casing, 18 is a mounting nut, 19 is a coil, and 20 is a release (recovery spring).

Figure 3 shows that the plunger magnet is
This is an example of an OFF (excited) state.

The iron core 16 reciprocates in the left-right direction in the drawing with respect to the plunger magnet body. In the OFF state, it is held at the initial position by the relay spring 20.

In this embodiment, there is a tap 2 at the tip of the iron core 16.
1, and after fitting one end of the housing 14 therein, the slider 15 is screwed together. This slider 15 is formed with a groove 22 to which one end of the spring 13 is fixed. The other end of the spring 13 is
It is fixed to the protrusion of the plunger head 11. Therefore, one end of the housing 14 is movable in the axial direction by simply fitting into the iron core. Due to the tension of the spring 13, one end thereof is brought into contact with the slider 15.

When the plunger magnet is turned ON (excited), the iron core 16 moves rightward in the drawing.As a result, as shown in FIG.
The protruding movement follows the forward movement of 6.

At this time, if the head 11 collides with a key top or the like, a situation as shown in FIG. 4b will occur. That is, the spring 13 is further compressed by the external force (reaction force) P from the key top. As a result, the head 11 and the casing 14 are retracted to the left with respect to the iron core 16.

As mentioned above, the key press force should be around 100grf. In this embodiment, the tension force of the spring 13 is
By setting it to 200grf, as shown in FIG. 4b, the spring 13 caused a deflection when the key was pressed, and it was possible to press the key reliably.

Further, a deflection amount S of the head 11 is allowed with respect to the plunger stroke ST (FIG. 4). Therefore, some error in the relative distance between the key top surface and the plunger magnet can be tolerated.

[Effect of idea]

As described above, according to the present invention, by using an existing plunger magnet, it is possible to appropriately set the impact force caused by the movement of the mover by interposing a buffer member. In particular, when used in a keyboard keying device, only the pressing force necessary for pressing a key can be applied to the keyboard side. This eliminates the need to apply extra load to the keys, and also makes it possible to reduce the sound of the keys.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a diagram showing an example of a plunger magnet (keying device) to which the present invention is applied, and Fig. 3 is a diagram showing the principle of the present invention. FIGS. 4a and 4b are diagrams illustrating the operating state of the embodiment when the present invention is applied. 11 is a plunger head, 13 is a buffer spring, 14 is a housing, and 15 is a slider.

Claims (1)

[Claims for Utility Model Registration] A main body 2, a movable element 3 that can reciprocate with respect to the main body 2, faces an object to be pressed, and presses the object, a movable element provided at the tip of the movable element 3 and movable. A striking head 5 which is configured to be reciprocally movable relative to the movable element 3 and presses the object to be pressed; and a striking head 5 which is interposed between the striking head 5 and the movable element 3 and which absorbs the impact impact force of the striking head 5. A pressing mechanism comprising: a plunger magnet 1 equipped with a spring 6; and a substrate 8 supporting a plurality of plunger magnets 1 at predetermined positions relative to an object to be pressed.