JPH0217295Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pen actuator for controlling pen up-down of a recorder or the like. In pen up-down control of this type of recorder, etc.,
In order to record detailed images and the like at high speed, it is necessary to perform pen up-down at extremely high speed.

Currently, pen up and down reciprocating motions of 20 times/second are required.

For this purpose, the operating portion must be lightweight and capable of generating high driving force. The conventional movable iron core type linear actuator, which performs linear motion similar to this type of pen actuator, has the disadvantage that the weight of the moving part increases, and also the movable coil type linear actuator similar to this invention. The linear actuator also had the drawbacks described below. Therefore, the first objective of this invention is to realize a pen actuator that has a simple structure and is inexpensive to manufacture. A second objective is to realize a pen actuator that is small and can obtain sufficient driving force.

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

Fig. 1 is a schematic diagram illustrating a conventional device related to a pen actuator, Figs. 2 and 3 are illustrations of an embodiment of the pen actuator related to the present invention, and Fig. 2 is an explanatory diagram of its assembly; FIG. 3 is a schematic diagram illustrating its internal configuration.

In Figures 1, 2 and 3, 1 is a coil mount, 11 is a coil mount frame, 12 is a lead wire passage, 13 is a terminal, 14 is a shaft mount, 15 is a coil winding frame, 2 is a coil , 21 is a lead wire, 3 is a spring, 4 is an exterior yoke, 5 is an internal structure of the pen actuator, 51 is a bottom yoke, 52 is a magnet, 53 is a center yoke, 54 is a magnet, and 55 is an upper yoke.

First, a conventional device will be explained. Please refer to FIG.

The coil attachment 1 has a coil winding frame 15 etc. integrally formed of aluminum or the like, and has a structure in which the coil 2 is wound around the coil winding frame 15.

Further, its internal configuration is such that a magnet 52 and an upper yoke 55 are formed in a laminated manner on a bottom yoke 51, as shown in FIG. 1b. Therefore, the magnetic flux generated from the magnet 52 passes through the coil 2, and by switching the current in the coil 2, the coil 2, that is, the coil fixture 1, is driven up and down.

By the way, in this conventional device, the coil 2 is wound around the coil winding frame 15, but there are parts unrelated to the work of winding the coil 2 (such as the upper part of the coil fixture 1), which makes the work difficult. It was hot. That is, in places where precision is required, manufacturing is difficult, requiring skill and increasing the number of man-hours, resulting in high manufacturing costs.

2 Furthermore, since a coil fixture integrally formed of aluminum or the like is used, it is necessary to completely insulate the coil 2, the lead wire of the coil 2, and the contacting parts of the terminal 13, which reduces manufacturing costs. This was one of the factors contributing to the increase in

3. Also, since this conventional device is configured to generate magnetic flux using one magnet 52, leakage magnetic flux from the upper yoke 55 (indicated by an arrow) is generated as shown in FIG. 1b. ) is increasing, so in order to obtain the necessary driving force,
It is necessary to take measures such as increasing the strength of the magnet 52 or increasing the current supplied to the coil 2, which is one factor that hinders miniaturization.

4. Since the coil winding frame 15 is normally required to be about 0.2 mm, the actual number of turns of the coil 2 is reduced accordingly, so that the applied electric power that generates the driving force for the vertical movement of the pen is sufficiently involved in the vertical movement of the pen. As a result, coil 2 and internal magnet 5
There was a drawback that loss occurred in the magnetic circuit with 2.

The present invention has been devised to eliminate such drawbacks, and will be described in detail below.

See Figure 2.

The coil fixture 1 is integrally formed by molding plastic. A coil mounting frame 11 corresponding to the diameter (inner diameter in this embodiment) of a coil 2, which will be described later, is formed in this coil mounting tool 1. Furthermore, coil 2 is attached to coil mount 1.
The notch 12 that should serve as a passage for the lead wire 21 of
is formed, and a terminal 13 is provided in the vicinity thereof. A drive shaft (not shown) equipped with a recording pen (not shown) is inserted and fixed into the shaft mounting portion 14 .

The coil 2 itself is formed of copper wire or aluminum wire using a suitable jig. In this case, the coil 2 may be soaked with adhesive to make it more stable.

The spring 3 is stopped by a spring stop (not shown) provided on the lower surface of the coil fixture 1 and a spring stop 56 provided on an upper yoke 55, which will be described later, to smooth the operation of the actuator.

The exterior yoke 4 is made of iron.

The pen actuator internal structure 5 includes a bottom yoke 51 made of iron, a magnet 52, a central yoke 53 made of iron, a magnet 54, and an upper yoke 5 made of iron.
5 are formed in a laminated form using an adhesive. The pen actuator mounting plate 56 is attached to the bottom yoke 51 with screws (not shown). Further, the pen actuator mounting plate 56 serves to mount the pen actuator at a predetermined position on the device. 561 is a screw hole.

Next, an example of how to assemble this actuator will be explained.

First of all, the coil mounting frame 1 of the coil mounting tool 1
A pre-formed coil 2 is inserted into the coil 1 and bonded.

Next, the lead wire 21 of the coil 2 is pulled out, passed through the lead wire passage 12, and soldered to the terminal 13.

Second, the exterior yoke 4 is adhesively fixed to the bottom yoke 52 of the actuator internal structure 5. In this case, the exterior yoke 4 and the bottom yoke 52 have the same diameter.

In the third step, the two parts formed by these two steps are joined together. The spring 3 is fixed to the spring stop 56 of the actuator internal structure 5 and the spring stop (not shown) provided on the lower surface of the coil fixture 1, so that the coil fixture 1 side is floated on the actuator internal structure 5. Therefore, the coil 2 is placed in a predetermined position due to the strength of the spring 3 and the weight of the coil mount 1. In this embodiment, the position is adjusted to face the central yoke 53.

See Figure 3.

FIG. 3 explains the magnetic configuration of the pen actuator related to the present invention, in which two magnets 52 and 54 are arranged so as to face each other with the same polarity across a central yoke 53, which is an iron core. ing. Therefore, in this case, almost all of the magnetic flux from the lower magnet 52 passes through the coil 2. Furthermore, magnetic flux passing through the coil 2 is also supplied from the upper magnet 54. Although there is some leakage magnetic flux from the upper yoke 55, the magnetic flux passing through the coil 2 is dramatically increased compared to the conventional actuator shown in FIG. 1b. In this way, this pen actuator can significantly reduce leakage magnetic flux even though the upper yoke 55 is open. The upper magnet 54 works to make the magnetic flux from the lower magnet 52 act on the coil 2 efficiently.

Therefore, the upper magnet 54 does not need to be large, and can be placed in an empty space, and sufficient driving force can be obtained.

As described above, the present invention has the advantage that the structure is simple and the workability is greatly improved. Further, since it is integrally formed from plastic, there is an advantage that there is no need to perform insulation treatment, etc., and there is an advantage that it can be manufactured at a comprehensive cost.

Furthermore, there is an advantage that sufficient driving force can be obtained by combining two magnets. Therefore, by providing this magnet in an empty space, an actuator that is small and has sufficient driving force can be realized. Furthermore, since the coil winding frame of the conventional device is not required, the number of turns of the coil can be increased accordingly. In this example, the coil wire is approximately
Since it is 0.2mm, it is wound even more than conventional devices. Therefore, driving torque can be increased.

[Brief explanation of the drawing]

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

Claims (1)

[Scope of Claim for Utility Model Registration] In a pen actuator for controlling pen up-down of a recorder, etc., a coil mount integrally formed of plastic, a coil mount formed at the lower end of the coil mount, A movable coil portion consisting of a hollow coil whose upper end portion is attached to the coil mounting portion and whose lower portion is mostly exposed; a bottom yoke made of a magnetic material; and the bottom portion formed at the center of the top of the bottom yoke. a first permanent magnet having a smaller upper area than the yoke; a central yoke made of a magnetic material formed in the upper center of the first permanent magnet and having an upper area substantially the same as that of the first permanent magnet; a second permanent magnet having substantially the same upper area as the first permanent magnet, the second permanent magnet having substantially the same upper area as the first permanent magnet and having the same polarity opposed to the first permanent magnet; an upper yoke formed of a magnetic material and having an upper area approximately the same as that of the first permanent magnet; a hollow exterior yoke, which has a structure in which an exposed hollow coil of the movable coil portion is inserted via a spring into a space between a component above the bottom yoke of the internal configuration and the exterior yoke; and a pen actuator configured to raise or lower a pen attached to the movable coil portion in accordance with electric power applied to an exposed coil of the movable coil portion.