JPS637940Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a compact cassette type magnetic head demagnetizer equipped with a push button switch mechanism suitable for on/off control.

Conventionally, this type of demagnetizer for a magnetic head has a demagnetizing head 22 biased outwardly by a spring body 28 in a magnetic head insertion window, as shown in FIG. Generally, a limit switch 45 is installed, and when in use, the magnetic head 13 on the magnetic recording device side demagnetizes the degaussing head 2.
2 while moving backward, the actuator 46 of the limit switch 45 is pressed at the rear end of the degaussing head 22 to turn on the switch 45.
operating an electrical circuit. However, magnetic head 1
3 varies depending on the regenerator used, and if there is little margin in the movement stroke of the degaussing head 22 on the demagnetizer side, the degaussing head 22 may be pushed further even after the switch 45 is turned on at the position shown in Fig. 6b. In the worst case, as shown in FIG. 6c, excessive deformation stress is applied to the actuator 46, causing damage to the switch 45.

This invention was made with attention to the above problem, and the pushing stroke length can be set arbitrarily.
There is no risk of excessive stress being applied to the switch body,
Moreover, it is an object of the present invention to provide a demagnetizer for a magnetic head equipped with a push-button switch mechanism that can perform a reliable switching operation regardless of the pressing distance.

The details will be explained below based on the drawings.

In FIGS. 1 to 3, an upper case 1 and a lower case 2 are joined together with a tapping screw 3 to form a main body case 4 having an external shape substantially the same as that of a Phillips-type compact cassette. A cleaning mechanism 5 and a degaussing mechanism 6 are built inside.

The cleaning mechanism 5 has an impregnated cleaning tape 10 stretched between the feed-out and take-up side hubs 8 and 9 which are rotatably mounted on the rotary shaft insertion hole 7, and also covers the circumferential surface of the feed-side guide roller 11. The tape 10 is covered with an impregnated layer 12 such as a sponge, and when the tape 10 is run with the impregnated layer 12 impregnated with a volatile solvent such as alcohol, the tape 10
is guided from the feeding-side hub 8 to the feeding-side guide roller 11 and passes through the front of the main body case 4 to the winding-side hub 9.
It is wound up. At this time, the solvent contained in the impregnated layer 12 permeates into the cleaning tape 10 due to the tension during tape running, thereby cleaning the surface of the magnetic head 13 on the side of the magnetic recording/reproducing apparatus.

On the upper surface of the upper case 1, at a position where the feeding and winding side hubs 8 and 9 face each other, there is a substantially rectangular shape having a size such that both hubs 8 and 9 can be taken out from above, that is, the length of at least one side is larger than the hub diameter. opening 14.1
4, and the openings 14 and 14 are connected to the lid body 1.
5 and 15, the lid is openable and closable, and the upper case 1 is further provided with a narrow tape take-out groove 16 corresponding to the running path of the cleaning tape 10 to form a series of openings. The lid body 15 has its outer edge 17 connected to both openings 1.
4 and 14, each hinged to the periphery of the
A locking tool 19 is provided on the inner edge 18, and when the lid 15 is closed, the hook 20 of the locking tool 19 is engaged with the back side of the upper case 1.
Maintain the closed state of 5. The lock by the pawl 20 is released by pressing the operating piece 21 at the upper end of the locking tool 19 toward the lid, and by lifting the operating piece 21 upward while pushing it in, the lid 15 is opened, and the cleaning mechanism 5 and the battery 24.

The degaussing mechanism 6 includes a degaussing head 22 that comes into contact with the magnetic head 13 on the magnetic recording/reproducing device side and applies a predetermined demagnetizing attenuating magnetic field to the head 13;
An electric circuit 23 that sends a degaussing signal to the degaussing head 2; and an electric circuit 23 that sends a demagnetizing signal to the degaussing head 2;
3, and a push button switch mechanism 25 for controlling the on/off of energization to 3.

The degaussing head 22 is arranged so that the protective piece 26 at the tip is aligned with the magnetic head insertion window 27.
The collar 29 of the degaussing head 22 is always biased by the spring body 28 in the direction of protruding from the main body case 4.
is in a position where it touches the stopper 30 of the lower case 2 and the tip of the protective piece 26 almost coincides with the front edge of the main case 4. When a tape cassette is set in a magnetic recording device and a playback operation is performed, the magnetic head 13 is inserted into the head insertion window 27, the degaussing head 22 is pushed by the magnetic head 13, and retreats into the case.
A push button switch mechanism 25 located behind the degaussing head 22 is actuated to turn on the electrical circuit 23.

The present invention is characterized by this push button switch mechanism 25.

The push button switch mechanism 25 is connected to the degaussing head 22.
A push button switch 32 such as a micro switch is arranged on the extension line of the extension and retraction of the degaussing head 22 so that the direction of its actuator 33 is perpendicular to the direction of the degaussing head 22. A guide plate 34 and a switch plate 35 extend parallel to the button switch 32. Guide plate 3
4 and the switch plate 35 are set to be approximately equal to the width of the push button switch 32. Therefore, the degaussing head 22 is connected to the guide plate 34 and the switch plate 3.
5 is guided by both side walls 36 and 37 of the push button switch 32 and moves in and out perpendicular to the direction in which the actuator 33 moves in and out. The tip 38 of the switch plate 35 is bent slightly open to form an opening 39, and under normal conditions, the upper part of the actuator 33 is opened as shown in Fig. 3a, and the actuator 33 is projected and pushed. The contact point 40 in the button switch 32 is turned off, but the switch plate 35 is turned off in conjunction with the retraction and retraction of the degaussing head 22 as shown in FIG. 3b.
The battery 24 is connected to the electric circuit 23 by climbing onto the actuator 33 and turning on the contact 40 as shown in FIG.

If the amount of movement of the magnetic head 13 is large, the demagnetizing head 22 will move further back as shown in FIG.
7, slides on the actuator 33 without changing the pushing amount of the actuator 33, and absorbs the error in the pushing length of the magnetic head 13 without applying excessive pushing force to the switch contact 40. and keep the switch on.

4 and 5 show other embodiments of the present invention, in which the push button switch 32 is arranged to the side of the degaussing head 22 instead of behind it in the embodiment shown in FIGS. 4a to 4c. . In this embodiment, since the push button switch 32 is not on the transition path of the degaussing head 22, the transition stroke of the degaussing head 22 can be made larger than in the previous embodiment without increasing the depth of the main body case 4, and the transition stroke of the degaussing head 22 can be made larger than in the previous embodiment. No pressing force is applied directly to the push button switch 32 side.

The embodiment of FIG. 5 has a push button switch mechanism 25.
A guide plate 3 that slides into both side walls 36 and 37 of the push button switch 32.
4 and the switch plate 35, the switch 3
The top wall 48 that comes into sliding contact with the top wall 47 on the second side
4 and the switch plate 35 are integrally formed to straddle the switch plate 35 to form a U-shaped switch portion 49. A retainer 50 is formed at the rear end of the switch section 49, and a spring body 28 is interposed between the tip of the push button switch 32 disposed inside the switch section 49 and the rear end of the demagnetizing head 22. Degaussing head 22
is biased toward the rear of the main body case 4. Further, the switch plate 35 is provided with a notch that opens outward corresponding to the position of the actuator 33 when the degaussing head 22 is not pushed in, so that the first opening portion 3
9, and a second opening 39a at the position of the actuator 33 at the pushing limit of the degaussing head 22.
has been established. The pushbutton switch mechanism 25 of this embodiment has a pushbutton switch 32 that is connected to the main body case 4.
Simply fixing it to the side does not require any adjustment such as positioning.Furthermore, from the switch-off state shown in Fig. 5a, simply pushing the degaussing head 22 a little as shown in Fig. 5b turns the switch on. As shown in FIG. 5c, when the pushing limit is exceeded, the tip of the actuator 33 is fitted into the open portion 39a again and the switch is turned off, causing a plurality of on/off operations, thereby making it possible to display abnormalities in the pushing amount.

Note that the shape of the opening part 39 is such that if the actuator 33 can protrude from the storage case 41, the shape of the opening part 39 is such that the switch plate 35
The opening 39 can be modified as appropriate, such as by making a recess, and by setting the position and size of the opening 39, the on/off timing of the switch can be arbitrarily determined.

As explained above, according to the magnetic head demagnetizer of this invention, the switch plate 35 having the opening part 39 that allows the actuator 33 to protrude in the normal state when the demagnetizing head 22 protrudes is provided on the demagnetizing head 22 side. In response to the retraction of the degaussing head 22, the switch plate 35 moves in a direction perpendicular to the direction of protrusion and retraction of the actuator 33, and slides into contact with the actuator 33 to retract the actuator 33. Therefore, the transition position of the switch plate 35, that is, the switch plate 35
Regardless of the amount of depression, the pressing strength and the amount of retraction of the actuator 33 do not change, and an accident in which excessive pressing force is applied to the push button switch 32 and damage is prevented.

Furthermore, the push stroke length of the switch can be set arbitrarily, and the on/off timing and number of times of the switch can also be set as appropriate, which has excellent advantages.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view illustrating the demagnetizer for a magnetic head according to the invention, FIG. 2 is a partially cutaway plan view, and FIGS. 3 a to 3 c are explanatory diagrams showing operating conditions. 4a to 4c are explanatory diagrams similar to FIG. 3 showing another embodiment of the present invention. FIGS. 5a to 5c are perspective views showing the operating state of yet another embodiment of the present invention. FIGS. 6a to 6c are explanatory diagrams showing the operating conditions of the conventional example. 4... Main body case, 6... Magnetism crossing mechanism, 13...
Magnetic head, 22... Demagnetizing head, 23... Electric circuit, 25... Push button switch mechanism, 27...
Head insertion window, 28... Spring body, 32... Push button switch, 33... Operator, 34... Guide plate, 35... Switch plate, 39... Opening part, 40
……contact.

Claims (1)

[Scope of utility model registration request] A degaussing head 2 that can move in and out of the head insertion window 27 is attached to the main body case 4 that has a head insertion window 27.
2, an electric circuit 23 that sends a degaussing signal to the degaussing head 22, and a push button switch 32 having a retractable actuator 33 that controls energization to the electric circuit 23 on and off in conjunction with the movement of the degaussing head 22 into and out. In a demagnetizer for a magnetic head with a built-in demagnetizer, a switch plate 35 is provided on the demagnetizing head 22 side and has an opening 39 that allows an actuator 33 to protrude when the demagnetizing head 22 is in the normal state of protruding. Then, the switch plate 35 moves in a direction perpendicular to the direction in which the actuator 33 appears, and the actuator 3
3. A demagnetizer for a magnetic head, characterized in that an actuator 33 is immersed in sliding contact with a magnetic head.