JPH0422285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape recorder in which the erasing head is constructed of a permanent magnet.

Conventional configurations and their problems In recent years, tape recorders have been required to be smaller, thinner, lighter, and more power efficient, and these have become the characteristics of the products.

The erasing head of conventional tape recorders erases the magnetic tape by passing an erasing current and generating a magnetic field, but this consumes a large amount of power and the battery life is short, especially in battery-powered tape recorders. There was a problem that made it impossible to record for a long time. In order to solve this problem, tape recorders in which the erasing head is composed of permanent magnets have been proposed in recent years, but in such tape recorders, the erasing head composed of permanent magnets must be separated from the magnetic tape during playback. In order to improve operability and to enable remote control, etc., especially for tape recorders that can be operated with an electric switch, the erasing head is controlled by a solenoid or the like to a position away from the magnetic tape and a position in which it comes in contact with the magnetic tape. During recording, it was common to continuously apply suction to the solenoid to bring the erasing head into contact with the magnetic tape. However, with this method, it is not possible to save power, and small solenoids with a small amount of windings require a large current to obtain power, which increases heat generation and adversely affects the running of the magnetic tape and electrical components. There were problems such as deterioration of performance and, in extreme cases of heat generation, smoke and ignition. In order to solve this problem, it is necessary to use a large solenoid with a large number of windings so that the current is small and the heat generation is small.
This makes it impossible to make the device smaller, thinner, and lighter.

In addition, in order to prevent further heat generation by using a small solenoid with a small amount of winding, a large current was passed through the solenoid at the beginning of suction, and after suction, the current was reduced to a small current for continuous suction, but this required two types of power sources. Therefore, a power transformer, a large-capacity resistor, and a changeover switch are required. Therefore, the structure is complicated and expensive, it is not possible to reduce the size, thickness, and weight of the solenoid, and although heat generation of the solenoid can be prevented, the transformer or resistor generates heat.

Further, in a tape recorder using an erasing head constructed of a permanent magnet as described above, there is a problem that the erasing head may be erroneously erased during reproduction unless the erasing head is reliably separated from the magnetic tape during reproduction.

Purpose of the Invention The present invention solves the above-mentioned problems, making it possible to achieve miniaturization, thinning, weight reduction, and power saving, further improving reliability, and preventing malfunctions such as erroneous erasure. The present invention provides a tape recorder that can perform

Structure of the Invention The present invention controls a recording/reproducing head to a first position where it is spaced from the magnetic tape and a second position where it is in contact with the magnetic tape, and an erasing head composed of a permanent magnet is controlled at a second position where it is spaced from the magnetic tape. a control means for controlling the erase head to a first position and a second position in contact with the erase head; a holding means for holding the erase head in the first position; a releasing means for releasing the hold of the erase head by the holding means; The tape recorder is provided with a blocking means for preventing the erasing head from being held in the first position, and the control means disables the erasing head during the process in which the recording head is moved from the first position to the second position by the control means. When the blocking of the blocking means is released and the releasing means is operated to release the holding of the erasing head, the erasing head is moved from the first position to the second position, and when the releasing means is made inactive, the erasing head is moved from the first position to the second position. When the erasing head is held at the first position and the recording head is moved to the second position, the blocking means again prevents the erasing head from being held at the first position. When the recording/reproducing head and the erasing head are moved from the second position to the first position, the erasing head is separated from the magnetic tape and is held by the holding means, thereby preventing errors. It is possible to prevent malfunctions such as erasing, and also to achieve reductions in size, thickness, weight, and power consumption, and to improve reliability.

DESCRIPTION OF THE EMBODIMENTS Figures 1 and 2 show the stopped state of a tape recorder in an embodiment of the present invention. This shows the device.

In FIGS. 1 and 2, 1 is a base plate, 2 is a capstan, which is rotatably mounted on a bearing 3 of the base plate 1, and concentrically and integrally constitutes a flywheel 4. A driving pulley 5 is rotatably provided on the shaft 6 of the substrate 1, and a driving gear 7 is formed concentrically and integrally therewith.

The clockwise rotation of the motor 9 is transmitted to the flywheel 4 and drive pulley 5 via the belt 8, so that the flywheel 4 and capstan 2 are rotated clockwise, and the drive pulley 5 and drive gear 7 are rotated counterclockwise. There is.

Reference numeral 10 denotes a first reel stand, which is rotatably mounted on a shaft 11 and rotated clockwise by a reel motor (not shown). Reference numeral 12 denotes a second reel stand, which is rotatably mounted on a shaft 13 and driven counterclockwise by a reel motor (not shown). These configurations use well-known methods and will not be described in detail.

Reference numeral 14 denotes a head substrate, which is slidably provided on shafts 15 and 16, and on which a recording/reproducing head 17 is mounted.

Reference numeral 18 denotes a control plate which, like the head board 14, is slidably mounted on the shafts 15 and 16, and is sandwiched between the board 1 and the head board 14.

Reference numeral 19 denotes an operating lever, which is rotatably mounted on a shaft 20, and a control shaft 21 at one end 19a is engaged with the control plate 18. A spring 22 is applied to the control shaft 21 and the head board 14, urging the stepped portion 14a of the head board 14 to come into contact with the control shaft 21.

Reference numeral 23 denotes an erasing head board, which is slidably mounted on shafts 24 and 25, on which an erasing head 26 made of a permanent magnet is placed, and which is moved by a spring 27 into the direction indicated by the arrow A.
The convex portion 23a is pressed against the first bent portion 18a of the control plate 18.

Reference numeral 28 denotes a lock plate which is rotatably provided on the shaft 29 and biased clockwise by a spring 30, and whose rotation by the bias is regulated by a regulating shaft 31. The end portion 28a of the lock plate 28 prevents the erasing head substrate 23 from moving in the direction of arrow A.

A blocking portion 23c is formed at the end 23b of the erasing head board 23, and prevents the lock plate 28 from rotating counterclockwise against the spring 30.

Reference numeral 32 denotes an erase solenoid connected to a relay plate 34 rotatably provided on the shaft 33 of the lock plate 28.

A pinch roller 35 is rotatably provided on a shaft 38 of a pinch roller lever 37 rotatably provided on a shaft 36, and is configured to abut against the capstan 2.

Reference numeral 39 denotes a pinch roller spring, which is placed on the pinch roller lever 37 and whose one end 39a is connected to the control plate 1.
The pinch roller lever 37 is engaged with the second bent portion 18b of the pinch roller lever 37, and is in contact with the bent portion 37a of the pinch roller lever 37.

40 is a cam pulley; a gear portion 41 meshed with the drive gear 7; and the other end 19b of the operating lever 19.
first and second cams 43 and 44 that control the shaft 42 of
, and is rotatably provided on a shaft 45.

This gear part 41 is formed with first, second, and third toothless parts 41a, 41b, and 41c, and the first cam 43 is formed with first and second positioning parts 43a and 43b.
are formed, and the second cam 44 has first and second positioning parts 44a, 44b and first and second protrusions 4.
4c and 44d are formed.

A lock lever 46 is rotatably mounted on a shaft 47 and biased clockwise by a spring 48.

A solenoid plate 50 is rotatably provided on the shaft 49 of one end 46a of the lock lever 46, and a lock convex portion 46c of the other end 46b is connected to the cam pulley 40.
The first, second and third locking parts 40a, 40b, 4
0c (shown in FIG. 11).

Reference numeral 51 denotes a play solenoid having an iron core 52 to which the solenoid plate 50 is attracted.

The shaft 5 is inserted into the hole 50a at one end of this solenoid plate 50.
3 is inserted with a gap, and this solenoid plate 5
0 rotation is regulated.

One end 48a of the spring 48 is attached to the cam pulley 4.
0 first, second, and third spring receivers 40d, 40
e, 40f, and the first,
When the second and third toothless portions 41a, 41b, and 41c are respectively positioned on the drive gear 7, the cam pulley 40 is biased clockwise.

A detection switch 54 is operated by a bent portion 19c of the other end 19c of the operating lever 19 to detect the operating state.

A tape cassette 55 includes a magnetic tape 56, first and second tape pads 57 and 58 (shown in FIG. 5), and a reel hub (not shown).

The upper recording/reproducing head 17 and the erasing head 26 are opposed to the first and second tape pads 57 and 58 and are in contact with the magnetic tape 56.

The operation of the tape recorder of this embodiment configured as described above will be explained below. First, the recording operation will be explained.

When the play solenoid 51 is continuously operated from the stopped state shown in FIGS. 1 and 2, the solenoid plate 50 is continuously attracted to the iron core 52 as shown in FIG.
The lock lever 46 is rotated counterclockwise against the spring 48 to the state shown in FIG.

When the lock lever 46 is set in this way, the other end 4
The lock convex portion 46c of the cam pulley 40 is released from the first locking portion 40a of the cam pulley 40, and the cam pulley 40 is moved from the state where the first toothless portion 41a is located on the drive gear 7 to the position of the spring 48. One end 48a
The gear portion 41 is rotated clockwise by the drive gear 7.
0 is rotated clockwise.

When the cam pulley 40 is rotated in this manner, the actuating lever 19 is rotated counterclockwise as shown in FIG. rotated to,
Therefore, the control plate 18, head substrate 14, and erasing head substrate 23 are slid in the direction of arrow B against the spring 27 as shown in FIG.

When the erasing head board 23 is slid in this manner, the end portion 23b is separated from the end portion 28a of the lock plate 28, and the prevention of the counterclockwise rotation of the lock plate 28 by the blocking portion 23c is released. When the erasing solenoid 32 is operated at the same time, the lock plate 28 is rotated counterclockwise against the spring 30, and the blocking of the end 23b of the erasing head board 23 by the end 28a is released. .

When the cam pulley 40 is rotated clockwise as described above, the second toothless portion 41b is positioned on the drive gear 7, and rotation transmission is interrupted, but at this time the lock lever 46 is placed in the state shown in FIG. Therefore, the second locking portion 40b of the cam pulley 40 is not locked by the lock convex portion 46c. Furthermore, one end 48a of the spring 48 comes into contact with the second spring receiving portion 40e, and the cam pulley 40 is rotated clockwise. Since the gear portion 41 is moved, the gear portion 41 is meshed with the drive gear 7 again, and the third
is rotated in the clockwise direction until the toothless portion 41c is located on the drive gear 7.

When the cam pulley 40 is rotated in this manner, the third locking portion 40c is locked to the lock convex portion 46c of the lock lever 46, and at the same time the spring 48 is locked.
One end 48a of the cam pulley 40 comes into contact with the third spring receiving portion 40f, and the cam pulley 40 is biased clockwise, thus being held in the state shown in FIG.

When the cam pulley 40 is set in this manner, the shaft 42 at the other end 19b of the operating lever 19 is rotated clockwise under the control of the first and second cams 43 and 44, and the shaft 42 is rotated clockwise as shown in FIG. is held in contact with the first positioning portion 43a of the first cam 43.

When the operating lever 19 is set in this manner, the control plate 18, the head board 14, and the erasing head board 23 are slid in the direction of arrow A, but the head board 14 is blocked by the shafts 15 and 16, as shown in FIG. The upper recording head 17 is biased in the direction of arrow A by the spring 22 and held in deep contact with the magnetic tape 56. Also, this erase head board 2
3 is blocked by shafts 24 and 25, so that it is biased in the direction of arrow A by the spring 27 as shown in FIG. 5, and the erasing head 26 is held in contact with the magnetic tape 56.

When the control plate 18 is slid in the direction of arrow A, the pinch roller lever 37 is rotated counterclockwise via the spring 39, and the pinch roller 35 is moved by the spring 39 as shown in FIG. The magnetic tape 56 is pressed against the capstan 2 and runs at a constant speed in the direction of arrow c. At the same time, the first reel stand 10 is rotated counterclockwise by a reel motor (not shown), and the magnetic tape 56 fed out by the capstan 2 and pinch roller 35 is wound onto a reel hub (not shown) to enter a recording state. .

At this time, even if the operation of the erase solenoid 32 is released, the lock plate 28 will not be able to hold the erase head board 2.
3, so there is no problem with the operation.

Next, the tape position detection operation from the recording state will be explained.

When the operation of the play solenoid 51 is released from the recording state shown in FIGS. 5 and 6, the lock lever 46 is rotated clockwise by the spring 48, and the third locking portion 40c of the cam pulley 40 is moved by the lock convex portion 46c. is unlocked. Therefore, this cam pulley 40 moves from the state where the third toothless portion 41c is located on the drive gear 7 to the one end 48 of the spring 48.
The gear portion 4 is rotated clockwise by a.
1 is meshed with the drive gear 7 to form the first toothless portion 41a.
is rotated clockwise until it is located at this drive gear 7.

When the cam pulley 40 is rotated in this manner, the shaft 42 at the other end 19b of the actuating lever 19 is connected to the first and second cams 43, 44 and the first convex portion 44c.
The state shown in FIG. 6 changes from the state shown in FIG. 7 to the state shown in FIG. 2.

When the operating lever 19 is in the state shown in FIG. 7, the control plate 18, head board 14, and erasing head board 2
3 is slid as shown in FIG.
is released from the state in which it is in contact with the erase head substrate 23.

Almost simultaneously with these, the play solenoid 51
When the lock lever 46 is operated again, the lock lever 46 is rotated counterclockwise against the spring 48, and the cam pulley 40 is rotated clockwise by the one end 48a of the spring 48, so that the first toothless portion 41a is rotated. From the state where the cam pulley 40 is positioned on the drive gear 7, the gear portion 41 is engaged with the drive gear 7, and the cam pulley 40 is rotated clockwise. At the same time, the play solenoid 51
When the operation is released, the cam pulley 40 moves to the second position.
The toothless portion 41b of the lock lever 46 is positioned on the drive gear 7, and the second locking portion 40b is locked with the lock convex portion 46c of the lock lever 46.
It is held as shown.

When the cam pulley 40 is configured in this manner, the shaft 42 of the other end 19b of the operating lever 19 is aligned with the first,
Second positioning portion 43b of second cams 43, 44
and 44b, resulting in the state shown in FIG.

When the operating lever 19 is set in this manner, the control plate 18 and the head board 14 are slid as shown in FIG.
The pinch roller 35 is in shallow contact with the capstan 3, and the pinch roller 35 is separated from the capstan 3. At the same time, when the first reel stand 10 is rotated clockwise or the second reel stand is rotated counterclockwise at high speed by the reel motor (not shown), the magnetic tape 56 is run at high speed, and the tape position is detected.

At this time, since the erasing solenoid 32 is not operated, the erasing head board 23 is blocked by the lock plate 28, and the erasing head 26, which is made up of a permanent magnet, is separated from the magnetic tape 56, and the erasing operation is not performed and the lock plate 28 is blocked. The end portion 28a of the erasing head board 23 is connected to the blocking portion 23c of the end portion 23b of the erase head substrate 23.
Even if the lock plate 28 is driven counterclockwise against the spring 30 due to an external impact or the like, the blocking of the erase head board 23 by the lock plate 28 is not released.

Next, the playback operation will be explained. When the play solenoid 51 is continuously operated from the stopped state shown in FIGS. 1 and 2, the control plate 18,
As the head substrate 14 slides, the upper recording/reproducing head 17 comes into deep contact with the magnetic tape 56 as shown in FIG. 10, and the pinch roller 35 is brought into pressure contact with the capstan 2 to enter the reproducing state.

At this time, since the erase solenoid 32 is not operated, the erase head 26 is separated from the magnetic tape 56 and no erase operation is performed, and this state is maintained even if an external impact is applied.

Further, when the play solenoid 51 is continuously operated from the tape position detection state, the playback state is entered.
Similarly to the tape position detection operation from the recording state, when the play solenoid 51 is controlled from the playback state, the tape position detection state is entered.

Further, when the continuous operation of the play solenoid 51 is released from the recording state and the playback state, the first locking portion 40a of the cam pulley 40 locks the lock lever 4.
It is in the stopped state shown in FIGS. 1 and 2 in which it is locked by the lock protrusion 46c of No. 6. These explanations overlap with the above content, so they will not be explained in detail.

Further, the play solenoid 51, the erase solenoid 32, etc. are controlled by electric control means, but since these are well known, they will not be described in detail here.

As described above, according to this embodiment, the erasing head 26 is controlled by the control board 18 that controls the recording/reproducing head 17, and when performing the tape position detection operation from the recording state, the tape position detection operation is performed via the stop state. Furthermore, since the erasing head 26 is held by the lock plate 28 at that time, the erasing head 26 is separated from the magnetic tape 56 when detecting the tape position, so that the tape running load can be reduced.
Furthermore, even if the erasing head is constructed with a permanent magnet, the erasing operation will not be performed.

Furthermore, since the above-mentioned erasing solenoid 32 can be controlled by short-time operation, that is, by intermittent operation, it is easy to control, and a small one with a small amount of winding can be used, which makes it possible to reduce the cost and make the product smaller, thinner, and lighter. It is possible to reduce power consumption. Furthermore, it is safe and has a low calorific value.

Further, even if an external shock is applied during the reproduction state or the tape position detection state, the erasing head 26, which is made up of a permanent magnet, does not come into contact with the magnetic tape 56, so that erroneous erasure will not occur.

Effects of the Invention The present invention controls a recording/reproducing head to a first position where it is spaced from the magnetic tape and a second position where it is in contact with the magnetic tape, and an erasing head composed of a permanent magnet is controlled at a second position where it is spaced from the magnetic tape. a control means for controlling the erase head to a first position and a second position in contact with the erase head; a holding means for holding the erase head in the first position; a releasing means for releasing the hold of the erase head by the holding means; A blocking means is provided for preventing the erasing head from being held in the first position, and the control means prevents the recording head from being held in the first position by the control means. When the block is released and the release means is operated to release the holding of the erase head, the erase head is moved from the first position to the second position, and when the release means is deactivated, the erase head is moved from the first position to the second position. When the erase head is held at the first position and the upper write/read head is moved to the second position, the blocking means again prevents the erase head from being held at the first position; When the recording/reproducing head and the erasing head are moved from the second position to the first position, the erasing head is separated from the magnetic tape and is held by the holding means, thereby preventing malfunctions such as erroneous erasing. In addition, it is possible to realize an excellent tape recorder that can achieve effects such as being smaller, thinner, lighter, and more power-saving, as well as having improved reliability.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the tape running device at the top of the tape recorder in the stopped state in an embodiment of the present invention, FIG. 2 is a plan view showing the mode switching device at the bottom of the board, and FIG. FIG. 4 is a plan view showing the state before and after the stop, FIGS. 5 and 6 are plan views showing the recording state, and FIG. 7 is a plan view showing the state before the stop. 8 and 9 are plan views showing the tape position detection state, FIG. 10 is a plan view showing the same playback state, and FIG. 11 is a back view showing the same cam pulley state. 2... Capstan, 7... Drive gear, 9... Motor, 14... Head board, 17... Recording/playback head, 18
... Control board, 19... Operating lever, 23... Erasing head board, 26... Erasing head, 28... Lock plate, 32
... Erasing solenoid, 35... Pinch roller, 40...
Cam pulley, 43...first cam, 44...second cam, 46...lock lever, 51...play solenoid, 55...tape cassette, 56...magnetic tape.

Claims (1)

[Claims] 1 The first head with the recording/playback head separated from the magnetic tape.
and a second position in which the erase head is in contact with the magnetic tape, and an erasing head made of a permanent magnet is controlled in a first position in which it is spaced apart from the magnetic tape and in a second position in which it is in contact with the magnetic tape.
a control means for controlling the erase head to the first position; a holding means for holding the erase head in the first position; a release means for releasing the hold of the erase head by the holding means; and a control means for controlling the erase head in the first position. Preventing means for preventing the holding from being released is provided, the control means releasing the blocking of the blocking means and the releasing means in the process of moving the recording head from the first position to the second position by the control means. When the erase head is activated and the holding of the erase head is released, the erase head is moved from the first position to the second position, and when the release means is made inactive, the erase head is held at the first position. At the same time, when the upper recording head is set to the second position, the blocking means again prevents the erasing head from being held in the first position, and the upper recording head and the erasing head are moved to the second position. 2. A tape recorder characterized in that when the erasing head is moved from the position to the first position, the erasing head is separated from the magnetic tape and is held by the holding means.