JPH0426987Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention is directed to the so-called inter-track area, which is a non-recording area that is interposed between recording areas of acoustic signals recorded on a magnetic tape, for example in a magnetic tape playback device. The present invention relates to a device for detecting.

BACKGROUND ART In such a magnetic tape track interval detection device, the magnetic tape is run at a speed suitable for reproduction, and the magnetic head is in contact with the magnetic tape at this time. By simultaneously operating the so-called play button for such operations and the so-called fast forward or rewind button for running the magnetic tape at high speed, the magnetic head identifies the unrecorded area of the magnetic tape and So-called song interval detection can be performed.

The prior art includes a switch whose switching mode changes when a play button is operated, and another switch whose switching mode changes when a fast forward or rewind button is operated.
These switches are connected in series, so that when the play button and the fast forward or rewind button are operated at the same time, a song interval detection operation is performed. With such prior art, it is clear that 2
This method requires two switches and is therefore less effective in reducing costs.

In other prior art devices, a relatively complex structure is used to change the switching behavior of a single switch when the play button and fast forward or rewind button are operated simultaneously.

Purpose The purpose of the present invention is to provide an improved magnetic tape track interval detection device that requires only a single switch and has a simplified configuration.

Structure of the invention The present invention has (a) a main board 1; (b) a main board 1 that is movable in a first direction A predetermined on the main board 1 and a second direction B that is the opposite direction; , an inclined part 2b which is inclined toward a third direction E which is an outer side perpendicular to the second direction B as the second direction B is reached, and a third direction from an end 2e of the inclined part 2b in the second direction B. A slide plate 2 in which an extending portion 2d extending parallel to two directions B is formed.
(c) A magnetic head 3 fixed to the slide plate 2, which contacts the magnetic tape when moved forward in the first direction A, and separates from the magnetic tape when moved backward in the second direction B; d) Provided to be movable in directions C and D parallel to the first and second directions A and B on the main board 1, a first protrusion 6a is formed, and the first protrusion 6a is displaceable in the first direction A for fast forwarding.
(e) A fast-forward lever 6 that is movable in directions C and D parallel to the first and second directions A and B on the main board 1;
(f) a rewinding lever 7 which is provided adjacent to the main board 1 and has a second protrusion 7a formed therein and is pressed in the first direction A for rewinding; Contact plate 9 extending substantially parallel to the first and second directions A and B
b, and a switch 9 whose switching state changes when the contact plate 9b is pressed in the third direction E; (h) A switch lever 8, which (h1) comes into contact with the inclined portion 2b and the extending portion 2d and is inserted into the guide groove 1c. (h2) A driving part 8b that comes into contact with the first and second projections 6a, 7a; (h3) Around the projections 8c, 8d from the driving part 8b. and a protrusion 8a which is formed at a position shifted by 90 degrees and which presses the contact plate 9b of the switch 9 in the third direction E, (i) when the main board 1 is in the first direction; In the state of being displaced forward in direction A, the extension portion 2d and the projections 8c, 8d are in contact with each other, and in this state, when the fast forwarding lever 6 and the rewinding lever 7 are displaced backward in the second direction B, , the protrusion 8a does not press the contact plate 9b, but when the fast forward lever 6 or the rewind lever 7 is displaced forward in the first direction A, the protrusion 8a presses the contact plate 9b in the third direction E. This is a magnetic tape track interval detection device.

Embodiment FIG. 1 is a simplified plan view showing the basic configuration of an embodiment of the present invention. In the magnetic tape playback device, a main board 1 is provided with a guide shaft 1a, a spring hook 1b, and a guide groove 1c. A magnetic head 3 is fixed to a slide plate 2 as a first member with screws 4. As shown in FIG. This slide board 2
Two guide grooves 2a are formed in the main board 1, which are inserted into and guided by the guide shafts 1a of the main board 1, thereby allowing movement in the directions of arrows A and B. The slide plate 2 is biased by a spring 5 in the direction of arrow B in a direction in which the magnetic head 3 is moved away from the tape. The slide plate 2 is formed with an inclined portion 2b for operating the switch 9, and an extending portion 2d extending from the inclined portion 2b. The inclined portion 2b is formed on the side of the slide plate 2, and as it moves in the direction of arrow B (that is, as it moves downward in FIG. 1), it extends in a third direction E (see FIG. It is slanted towards the left side. The extending portion 2d extends parallel to the direction B from the end portion 2e of the inclined portion 2b in the direction B. The magnetic head 3 is fixed to the slide plate 2,
When it is displaced forward in the direction of arrow A, that is, upward in FIG. 1, it contacts the magnetic tape, and when it is displaced backward in the direction of arrow B, as shown in FIG. 1, it separates from the magnetic tape. are doing.

The fast-forwarding lever 6 has an operation button 6d and is arranged so as to be movable in the directions of arrows C and D by a guide means (not shown). This fast-forwarding lever is connected to a fast-forwarding mechanism (not shown) and is biased in the direction of arrow C by a spring. When the button 6d is operated in the direction of arrow D, the fast forward mechanism
To fast-forward a magnetic tape at high speed in the same direction as the running direction during playback. This fast-forwarding lever 6 has a bent portion 6a formed therein.

The rewind lever 7 is movable in the directions of arrows C and D by a guide means (not shown), is connected to a rewind mechanism (not shown), and is biased in the direction of arrow C by a spring. and has a rewind button 7d. This rewinding lever 7 is formed with a bent portion 7a. The above-mentioned fast-forwarding lever 6 is provided so as to be displaceable in directions C and D parallel to the above-mentioned arrows A and B.
Pressing operation is performed in the direction of . Similarly, the rewind lever 7 is provided so as to be displaceable in directions C and D parallel to the arrows A and B, and is disposed adjacent to the fast forward lever 6, and is moved in the direction of the arrow A for rewinding. , that is, a pressing operation is performed in the direction of arrow D.

The switch lever 8 functions to change the switching mode of the switch 9. This switch lever 8 includes a protrusion 8a that can come into contact with the actuating part 9a of the contact plate 9b having elasticity, and a drive part 8 that is provided so as to be able to come into contact with the bent parts 6a and 7a.
b, and further includes an upper protrusion 8c and a lower protrusion 8d. These upper and lower protrusions 8c, 8d
is perpendicular to the plane of the paper of FIG. Upper protrusion 8c
can come into contact with the inclined portion 2b provided on the slide plate 2 and its extending portion 2d. Lower protrusion 8
d is inserted into the guide groove 1c formed on the main board 1 and guided to move in the left-right direction in FIG.
It is movable in the F direction and can be angularly displaced in the directions of arrows G and H within the guide groove 1c.

A contact plate 9b of the switch 9 and another contact plate 9c facing the contact plate 9b are connected to a processing circuit 12 including a microcomputer and the like. When the number of song intervals to be detected inputted by the input means 13 and the number of song intervals detected by the magnetic head 3 match, the drive source 14 such as a motor that drives the magnetic tape is stopped; Or it will be in the playback state again. The switch 9 is fixed on the main board 1, and its contact plate 9b extends substantially parallel to the directions of arrows A and B in its natural state, and when pressed in the direction of arrow E, it connects with another contact plate 9c. The switching state changes upon contact.

The guide groove 1c is elongated and extends in the direction of arrow E near the side of the slide plate 2.

The protrusion 8a of the switch lever 8 has a protrusion 8c,
The protrusion 8a is formed at a position approximately 90 degrees offset from the drive portion 8b around the protrusion 8d, and this protrusion 8a presses the contact plate 9b of the switch 9 at its operating portion 9a.

In the rest state of FIG. 1, the switch 9 is closed.

FIG. 2 is a plan view showing the reproduction state. In this playback state, the slide plate 2 moves as shown by the arrow A against the spring force.
The magnetic head comes into contact with the magnetic tape and can reproduce it. At this time, the inclined portion 2b of the slide plate 2 and its extending portion 2d are in contact with the upper protrusion 8c of the switch lever 8. Although the switch lever 8 is guided by the guide groove 1c of the main board 1 and moves in the direction of the arrow E, in this state, the actuating part 8a of the switch lever 8 does not come into contact with the actuating part 9a of the switch 9. Switch 9 remains closed.

Fast forward button 6 from the hibernation state shown in FIG.
When d is pushed forward in the direction of arrow D, the fast-forwarding lever 6 remains stopped as shown in FIG. As a result, the magnetic tape is run at high speed in the same direction as during playback. The bending portion 6a of the fast-forwarding lever 6 causes the driving portion 8b of the switch lever 8 to be angularly displaced in the counterclockwise direction G around the axes of the upper and lower projections 8c and 8d. At this time, although the driving part 8a approaches the actuating part 9a of the switch 9, the two do not come into contact with each other. Therefore, switch 9 remains cut off. This cut-off state of the switch 9 is the same even when the rewind button 7d is pushed in the direction of arrow D and moved forward.

To detect between songs, operate the play button (not shown) to move the slide plate 2 forward in the direction of arrow A as shown in Fig. 4 and keep it stopped, and at the same time fast forward or wind the slide plate 2. Return button 6
Push d and 7d in the direction of arrow D to move forward and stop. The state shown in the fourth figure shows a state in which the fast forward button 6d has been operated. The slide plate 2 is moved back slightly downward in FIG. 4 compared to when playing back, and is in a position where it comes into sliding contact with the magnetic tape. When the slide plate 2 is in the forward state shown in the fourth figure, the protrusion 8b of the switch lever 8 is guided by the guide groove 1c of the main board 1, and the upper protrusion 8c is guided by the slope 2b of the slide plate 2 and its extension. It comes into contact with part 2d and is moved in the direction of arrow E. The drive portion 8b of the switch lever 8 is brought into contact with and pressed by the bent portion 6a of the fast-forward lever 6 when the fast-forward button 6d is operated. Therefore, the switch lever 8 is angularly displaced in the counterclockwise direction G around the upper and lower projections 8c and 8d. In this way, the drive section 8a of the switch lever 8 displaces the contact plate 9b of the switch 9 to the left in FIG. 4 by abutting the contact plate 9b on its operating section 9a. This causes the switch 9 to become conductive. Therefore, the processing circuit 12 can perform song interval detection.

In the embodiment described above, the slide plate 2 was configured to be displaced by operating the playback button, and the fast forward lever 6 and rewind lever 7 were configured to be displaced by operating the buttons 6d and 7d. The driving may be performed by a driving source such as an electromagnetic solenoid.

Effects As described above, according to the present invention, it is possible to detect between songs using a single switch 9, and the configuration is simplified.

In particular, according to the present invention, the first and second directions A,
Near the side of the slide plate 2 that can be displaced in the direction B, the second
An elongated guide groove 1c extending in a third direction E perpendicular to the direction B is formed in the main substrate 1, and the guide plate 2
is moved forward in the first direction A, thereby the protrusions 8c and 8d of the switch lever 8 inserted in the guide groove 1c are displaced in the third direction E,
When the fast forward lever 6 or the rewind lever 7 is displaced forward in the first direction A with the protrusions 8c and 8d in contact with the extension 2d, the protrusion 8a of the switch lever 8 moves the contact plate 9b into the first direction. Since the pressure is applied in three directions E, sliding between the contact plate 9b and the protrusion 8a is prevented as much as possible, thereby achieving the excellent effect of enabling smooth displacement of the contact plate 9b. be done.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention in a rest state, FIG. 2 is a plan view showing the playback state of the embodiment, FIG. 3 is a plan view showing the fast forward state of the embodiment, and FIG. The figure is a plan view showing a state in which song interval detection is being performed. 2...Slide plate, 3...Magnetic head, 5...
Spring, 6...Fast forward lever, 7...Rewind lever, 8...Switch lever, 9...Switch, 1
2... Processing circuit.

Claims (1)

[Claims for Utility Model Registration] (a) Main board 1; (b) Displaceable in a first direction A predetermined on the main board 1 and a second direction B, which is the opposite direction; is an inclined part 2b which is inclined toward a third direction E which is an outer side perpendicular to the second direction B as it becomes the second direction B, and an end part 2e of the inclined part 2b in the second direction B. A slide plate 2 on which an extending portion 2d extending parallel to the second direction B is formed.
(c) A magnetic head 3 fixed to the slide plate 2, which contacts the magnetic tape when moved forward in the first direction A, and separates from the magnetic tape when moved backward in the second direction B; d) Provided to be movable in directions C and D parallel to the first and second directions A and B on the main board 1, a first protrusion 6a is formed, and the first protrusion 6a is displaceable in the first direction A for fast forwarding.
(e) A fast-forward lever 6 that is movable in directions C and D parallel to the first and second directions A and B on the main board 1;
(f) a rewinding lever 7 which is provided adjacent to the main board 1 and has a second protrusion 7a formed therein and is pressed in the first direction A for rewinding; Contact plate 9 extending substantially parallel to the first and second directions A and B
b, and a switch 9 whose switching state changes when the contact plate 9b is pressed in the third direction E; (h) A switch lever 8, which (h1) comes into contact with the inclined portion 2b and the extending portion 2d and is inserted into the guide groove 1c. (h2) A driving part 8b that comes into contact with the first and second projections 6a, 7a; (h3) Around the projections 8c, 8d from the driving part 8b. and a protrusion 8a which is formed at a position shifted by 90 degrees and which presses the contact plate 9b of the switch 9 in the third direction E, (i) when the main board 1 is in the first direction; In the state of being displaced forward in direction A, the extension portion 2d and the projections 8c, 8d are in contact with each other, and in this state, when the fast forwarding lever 6 and the rewinding lever 7 are displaced backward in the second direction B, , the protrusion 8a does not press the contact plate 9b, but when the fast forward lever 6 or the rewind lever 7 is displaced forward in the first direction A, the protrusion 8a presses the contact plate 9b in the third direction E. Magnetic tape track interval detection device.