JPH0645280B2 - Pen actuator - Google Patents

Description

The present invention relates to a pen actuator for controlling pen up / down of a recorder or the like.

When used in a recording apparatus such as an XY plotter, for example, this type of pen actuator needs to be attached to a carriage of the XY plotter and moved in two dimensions at high speed and high acceleration. Also, in this type of XY plotter, the response characteristic of the pen up / down operation of the pen actuator is extremely important for improving the recording speed. Considering these points, an ideal pen actuator should be small and lightweight, the driving force of the pen actuator should be stable within a specified range, and it should be easy and inexpensive to construct. ,. Therefore, a first object of the present invention is to realize a pen actuator which has a simple structure and is inexpensive to manufacture. Further, a second object is to realize a pen actuator that is small in size and can obtain a driving force.

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

FIG. 1 is a schematic diagram for explaining a conventional device relating to a pen actuator, FIGS. 2 and 3 are diagrams showing an embodiment of the pen actuator according to the present invention, FIG. 2 is an assembly explanatory diagram thereof, and FIG. It is a schematic diagram explaining an internal structure.

1, 2, and 3, 1 is a coil attachment, 11 is a coil attachment frame, 12 is a lead wire passage, 13 is a terminal, 14 is a shaft attachment portion, 15 is a coil winding frame, and 2 is a coil. , 21 is a lead wire, 3 is a spring, 4 is an exterior yoke, 5 is a pen actuator internal structure, 51 is a bottom yoke, 52 is a first permanent magnet, 53 is a central yoke, 54 is a second permanent magnet, and 55 is The upper yoke.

First, the conventional device will be described. Please refer to FIG. The pen actuator shown in FIG. 1 is a so-called open type device having an upper yoke.

The coil fixture 1 is made of aluminum or the like, and the coil reel 1
5 and the like are integrally formed, and the coil 2 is wound around the coil winding frame 15. The bottom surface of the coil winding frame 15 has a hole (not shown) having a size through which an internal structure described later passes, and is inserted.

Further, as for the internal structure thereof, as shown in FIG. 1 (b), a magnet 52 and an upper yoke 55 are formed in a laminated shape on a bottom yoke 51. Therefore, the magnetic flux generated from the magnet 52 cuts through the coil 2 and switches the current of the coil 2, whereby the coil 2, that is, the coil fixture 1 is driven up and down.

As described above, since this device has the open-type actuator structure, the device can be manufactured by inserting the coil attachment 1 from the upper portion, which is advantageous in that the manufacturing is easy.

However, in this conventional device: Although the coil 2 is wound around the coil winding frame 15, there is a portion unrelated to the operation of winding the coil 2 (such as the upper portion of the coil attachment 1), which makes workability difficult. That is, in a place where precision is required, there is a drawback in that the manufacturing cost is high because of the difficulty in the manufacturing, the skill is required, and the number of working steps is increased.

2. Furthermore, since the coil fixture integrally formed of aluminum or the like is used, it is necessary to completely insulate the coil 2 and the lead wire of the coil 2 and the contact portion of the terminal 13, which reduces the manufacturing cost. It was a factor to increase.

3. Further, in this conventional device, since the magnetic flux is generated by one magnet 52, the configuration shown in FIG.
As shown in (b), the leakage magnetic flux from the upper yoke 55 (indicated by an arrow) is large. Therefore, in order to obtain the necessary driving force, the strength of the magnet 52 should be increased, or Means such as increasing the current supplied to the coil 2 are required, which is one of the factors that prevent miniaturization.

The present invention has been made in order to take advantage of the conventional advantages and further eliminate the above-mentioned drawbacks, and the present invention will be described in detail below.

Please refer to FIG.

The coil attachment 1 is integrally formed by plastic molding. The coil attachment 1 is formed with a coil attachment frame 11 corresponding to the diameter of the coil 2 described later (inner diameter in this embodiment). Further, the coil fixture 1 is formed with a notch 12 to be a passage for the lead wire 21 of the coil 2, and the terminal 1 is provided in the vicinity thereof.
3 is provided. A drive shaft (not shown) equipped with a recording pen (not shown) is inserted and fixed in the shaft mounting portion 14.

The coil 2 itself is formed of a copper wire or an aluminum wire using an appropriate jig. in this case,
An adhesive may be dipped in the coil 2 to make the coil 2 more stable.

The spring 3 is stopped by a first spring stopper (not shown) provided on the lower surface of the coil fixture 1 and a second spring stopper 56 provided on the upper surface of the internal structure 5 described later to smooth the operation of the actuator.

The exterior yoke 4 is made of iron.

The internal structure 5 of the pen actuator includes a bottom yoke 51 made of iron, a first permanent magnet 52, and a central yoke 5 made of iron.
3 and the second permanent magnet 54, and in this embodiment, the upper yoke 55 made of iron is formed in a laminated shape by an adhesive. The pen actuator mounting plate 57 is mounted on the bottom yoke 51 with screws (not shown).
Further, the pen actuator mounting plate 56 functions to mount the pen actuator at a predetermined position of the device. 571 is a screw hole.

Next, an example of assembling this actuator will be described.

First of all, the coil 2 formed in advance is inserted and bonded to the coil mounting frame 11 of the coil mounting tool 1. Next, the lead wire 21 of the coil 2 is drawn out and soldered to the terminal 13 through the lead wire passage 12.

Second, the exterior yoke 4 is adhesively fixed to the bottom yoke 51 of the actuator internal structure 5. In this case, the outer yoke 4 and the bottom yoke 51 have the same diameter.

In the third, the two parts formed by these two steps are joined. The coil fixture 1 side is floated in the actuator internal configuration 5 by fixing the spring 3 to the spring stopper 56 of the actuator internal configuration 5 and the spring stopper (not shown) provided on the lower surface of the coil fixture 1. Therefore, the coil 2 is arranged at a predetermined position depending on the strength of the spring 3 and the weight of the coil fixture 1. In this embodiment, the position is adjusted so as to face the central yoke 53.

Please refer to FIG.

FIG. 3 illustrates the magnetic structure of the pen actuator configured as shown in FIG. Two first and second permanent magnets 52, 54 are arranged so that the same poles face each other with a central yoke 53, which is an iron core, interposed therebetween.

Therefore, almost all of the magnetic flux from the lower first permanent magnet 52 penetrates the coil 2. Furthermore, the magnetic flux from the second upper permanent magnet 54 also penetrates this coil 2. Although some leakage magnetic flux exists above the internal structure 5 of the actuator, that is, from the second permanent magnet 54 or the upper yoke 55, the magnetic flux that breaks the coil 2 is smaller than that of the conventional actuator shown in FIG. 1 (b). Can be dramatically increased. Upper second magnet 5
Since 4 can be provided in a vacant space, sufficient driving force can be obtained without increasing the size of the permanent magnet used.

As described above, according to the present invention, there is an advantage that the configuration is simple and the workability thereof is significantly improved. Also,
Since it is integrally formed of plastic, there is an advantage that there is no need to perform insulation treatment or the like, and there is an advantage that it can be manufactured at a low cost comprehensively.

Furthermore, by combining two permanent magnets so that the same poles face each other, there is an advantage that the magnetic flux that breaks through the moving coil of this actuator can be dramatically increased and a sufficient driving force can be obtained. Of the two permanent magnets, the upper permanent magnet (second permanent magnet) is provided in an empty space in the internal structure of the actuator, so that an actuator having a small size and a sufficient driving force can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating a conventional pen actuator,
2 and 3 are configuration explanatory views showing an embodiment of the present invention. 1 ... Coil fixture, 2 ... Coil, 3 ... Spring, 4 ... Exterior yoke, 5 ... Actuator internal configuration

Claims (1)

[Claims] 1. A container having a bottom yoke made of a magnetic material and an outer yoke made of a magnetic material attached to the bottom yoke so that its lower end is in close contact with the bottom yoke. An open-top pen actuator for controlling the pen up / down of a recorder, etc., in which an internal structure including a permanent magnet is formed, and a movable coil is inserted in a space between the exterior yoke and the internal structure. In, the coil mounting member integrally formed of plastic, the coil mounting frame formed at the lower end of the coil mounting member,
Movable coil part consisting of exposed hollow coil to which upper end part is attached, bottom yoke made of magnetic material, first permanent magnet having upper area smaller than the bottom yoke formed in the central part of the bottom yoke A central yoke made of a magnetic material and formed in the upper central portion of the first permanent magnet and having substantially the same upper area as that of the first permanent magnet; An internal structure composed of the first permanent magnet and a second permanent magnet having substantially the same upper area as the poles facing each other, a structural part above the bottom yoke of the internal structure, and the exterior. The exposed hollow coil of the movable coil portion is inserted into the space between the yoke and the yoke via a spring provided between the lower surface of the coil fixture and the internal structure, Bare pen actuator in accordance with the power applied to the coil formed by construction so as to up or down the pen attached to the movable coil portion of the moving coil section.