JPH0356886Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a demagnetizer for demagnetizing a magnetic head of a tape recorder or the like. It has a built-in degaussing head, etc., and by attaching this degaussing cassette to a tape recorder and pressing the PLAY button, the tape recorder's magnetic head (head to be demagnetized) automatically matches the degaussing head of the degaussing cassette. The present invention relates to a demagnetizer in which a micro switch for driving a degaussing circuit in a demagnetizer cassette is turned on via a spring member.

[Prior art and its problems]

Normally, when a tape recorder is used for a long period of time, the magnetic field generated by the tape recorder tends to magnetize the magnetic head and deteriorate the recording and playback characteristics.
It is necessary to demagnetize at regular intervals.

Therefore, in order to facilitate the degaussing of the magnetic head in a cassette tape recorder, a degaussing signal generating circuit 2 is built into a case of the same standard as a Phillips-type compact cassette as shown in Figure 5, and the head to be demagnetized is inserted. A degaussing head 4 with its front face facing the window 3 is arranged so as to be retractable inside the case 1, and both ends of the degaussing head 4 are pressed in the direction of the insertion window 3 by bringing the central part into contact with the degaussing head 4. A long spring member 5 is provided to support the degaussing head 4.
By the spring material 5 which elastically deforms as the
A demagnetizer A has been proposed in which a micro switch 6 is turned on. This demagnetizer A can be used in normal tape playback operations, that is, by simply pressing the PLAY button after properly setting the case 1 in the tape recorder, the degaussing head 4 is pushed back by the head to be degaussed, and Micro switch 6 turns on,
In conjunction with this, the demagnetizing signal generating circuit 2 operates to generate an attenuated alternating voltage, and the magnetic head of the tape recorder is automatically demagnetized by the demagnetizing head 4. Therefore, the degaussing operation does not require any skill and is extremely easy to use. In FIG. 5, reference numeral 7 indicates a power supply section of the demagnetizer A, which is made of a button-type mercury battery, etc., and 8 indicates a rotary shaft insertion hole of the tape recorder.

However, in the above conventional configuration, the switch of the actuating piece 9 is biased by the return leaf spring in the micro switch 6 shown in FIG.
The operating stroke _S1 from the OFF state to the ON state varied due to dimensional errors that are unavoidable during manufacturing. What is the difference between the tip of the actuating piece 9 and the positioning hole 10 of the micro switch 6?
The distance S ₂ in the OFF state has a tolerance of, for example, 6.8 ± 1.5 mm, so the above operating stroke S ₁
It varied by about 0.5 to 1.5 mm. Therefore, as shown in FIG. 7, even if the backward stroke (the amount of protruding deformation of the spring member 5) of the degaussing head 4 transitioning from the state shown by the solid line to the state shown by the two-dot chain line is constant, sometimes the switch is turned ON. There is a risk of causing a situation where the
There was a problem with the operational reliability of the switch.

[Purpose of invention]

Therefore, the purpose of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide highly reliable demagnetization that allows the switch to turn on even if there are variations in the operating stroke _S1 of the actuating piece 9 until the switch is turned on. It is to provide the equipment.

[Summary of the idea]

In order to achieve the above object, the demagnetizer of the present invention is summarized in that the mounting position of the spring material that presses and drives the operating piece of the microswitch is adjustable.

[Example of idea]

FIGS. 1 and 2 relate to one embodiment of the present invention, and in each figure, the same members as in the prior art are given the same reference numerals.

In the figure, reference numerals 11 indicate pin-shaped protrusions for holding both ends of the spring material 5. In this embodiment, three pin-shaped protrusions are installed at each end of the spring material 5 made of wire springs. The distance between the protrusions 11, 11 is made equal to the wire diameter of the spring material 5. and,
Depending on variations in the operating stroke S ₁ of the operating piece 9 until the switch is turned ON, the spring member 5 is selectively positioned at the solid line position or the two-dot chain line position in the figure, so that, for example, the operating stroke S ₁ is the standard. If the value is smaller than this value, the spring member 5 will be installed at a position closer to the micro switch 6 shown by the solid line in FIG. 1 from the reference installation position shown by the two-dot chain line. At the time of attachment, the spring material 5 is held so that it does not slip out by simply inserting both ends of the spring material 5 between the protrusions 11.

In the above embodiment, the spring material 5 is movable and adjustable in parallel, but only one end side of the spring material 5 may be movable and adjustable as shown in the third figure. The plate spring material 5' may be made of metal or synthetic resin as shown in FIG.
The means for positioning both ends of the spring members 5, 5' can be modified in various ways, such as protrusions with notches, and it goes without saying that the number of points to be positioned may be two or more.

As described above, the mounting position of the spring material 5 that presses the actuating piece 9 is selected according to the variation in the actuating stroke S ₁ of the actuating piece 9, so the actuating stroke S ₁ of the actuating piece 9 is smaller than the reference value. Even if the micro switch 6 is turned on, by arranging the spring material 5 that drives it a predetermined amount close to the actuating piece 9, the spring material 5 gives the actuating piece 9 a sufficient stroke to turn the switch ON. I can guarantee that it will.

[Effects of the invention] As detailed above, according to the invention, even if there is variation in the operating stroke of the actuating piece of the micro switch until the switch is turned ON, the spring material that presses it will adjust the mounting position accordingly. Since it is variable, it is guaranteed that the switch will always be turned on, making it possible to provide a demagnetizer with high operational reliability.

[Brief explanation of the drawing]

Figures 1 and 2 relate to one embodiment of the present invention; Figure 1 is a plan view of the main part, Figure 2 is a perspective view of the main part, and Figure 3 is a perspective view showing another embodiment of the invention. , FIG. 4 is a perspective view of a spring material according to yet another embodiment of the present invention, FIGS. 5 to 7 are related to a conventional example, and FIG. 5 shows the entire demagnetizer with the upper surface of the case removed. FIG. 6 is an explanatory view showing the microswitch, and FIG. 7 is a plan view of main parts for explaining the operating state. A... Demagnetizer, 1... Case, 2... Demagnetizing signal generation circuit, 3... Insertion window, 4... Demagnetizing head,
5, 5'...Spring material, 6...Micro switch,
9... Actuation piece, 10... Positioning hole, 11... Protrusion.

Claims (1)

[Scope of utility model registration request] Inside the case body of the demagnetizer, there is a degaussing signal generation circuit that generates an alternating voltage, a micro switch that controls the drive of the degaussing signal generation circuit, and a front side of the degaussing head inserted into the insertion window provided in the case body. a demagnetizing head that faces the demagnetizing head and is retractably held inside the case body; a long spring member that abuts the center portion of the demagnetizing head against the rear end of the demagnetizing head and presses the demagnetizing head toward the insertion window; and an actuating piece of the microswitch driven by the spring material that protrudes and deforms when the degaussing head retreats, wherein the mounting position of the spring material with respect to the microswitch is adjustable. A demagnetizer characterized by: