JPH031738B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auto-reversing device for a tape recorder that changes the running direction of the magnetic tape and also flips the magnetic head upside down.

2. Description of the Related Art Auto-reverse tape recorders are already well known, which automatically switch the running direction of a magnetic tape so that recording or playback can be performed even when the magnetic tape runs in either the left or right direction. This type of tape recorder is equipped with a pair of magnetic heads and uses both heads selectively depending on the running direction of the magnetic tape. There is a method in which the position of the core gap is changed in the tape width direction by moving the magnetic head. Furthermore, 1
There are two methods for moving each magnetic head: one method that moves the magnetic head up and down, and another method that changes the height position of the core gap by rotating the magnetic head 180 degrees at a time and flipping it upside down.

The present invention relates to an improvement in an auto-reversing device that flips one magnetic head upside down.

Generally, this type of auto-reverse device has a magnetic head rotatably attached to a head support, and is configured to rotate the magnetic head 180 degrees at a time when changing the running direction of the tape.

However, in order to switch the running direction of the magnetic tape, it is necessary to move the pinch rollers provided on both sides of the magnetic head toward and away from their respective capstans. In addition, it is necessary to link the pinch roller drive mechanism for this purpose with the drive mechanism for vertically inverting the magnetic head, which has the disadvantage of complicating the configuration.

The present invention was made based on the above circumstances, and its object is to drive a pinch roller with a simple configuration in an auto-reverse device that flips one magnetic head upside down when changing the running direction of a magnetic tape. In some cases, the magnetic head is turned upside down.

In order to achieve this object, the auto-reverse device of the present invention has a head support attached to the tape recorder main body board so that it can move forward and backward, and a magnetic head supported on the head support so that it can be turned up and down.
A pinch roller pressing member is attached to the head support so as to be reciprocally movable, the magnetic head is turned upside down as the pressing member moves forward and backward, and the pinch roller is pressed as the head support moves forward. The pinch roller is configured to press one of the selected pinch rollers against the corresponding capstan.

Hereinafter, a detailed explanation will be given based on examples.

In the figure, 1A is a recording/playback magnetic head, 1
B is the erase head, 2 is these heads 1A, 1B
3 is a rotating plate to which the head holder 2 is attached. And this rotating plate 3
is rotatably supported by a head support 5 attached to the tape recorder main body board 4 so as to be movable forward and backward. The core gap 6 of the recording/playback magnetic head 1A is located away from the center 0 of the rotating plate 3, and the dimension between the center 0 of the rotating plate 3 and the core gap 6 is the channel center of the 2-channel magnetic tape. It is set to 1/2 of the distance between the two.

The heads 1A, 1B are attached to one surface of the rotary plate 3, and a hollow support shaft 7 is vertically fixed to the center of the other surface of the rotary plate 3.
Lead wires 8 connect between the magnetic head 1A and erase head 1B and a control circuit (not shown).
is inserted through the inside of this support shaft 7.
On the other hand, the head support body 5 is provided with a through hole 9 through which the support shaft 7 is inserted. Note that a tape guide 10 is integrally formed with the head support 2.

Three recesses 11 . . . , 12 . Hard spheres (for example, steel balls) 13..., 1 are placed in these recesses.
4... is accommodated.

In addition, a pair of locking pieces 15 are provided on one side of the rotating plate 3.
A and 15B are bent. On one side of the head support 5 are screw mounting pieces 16A, 16.
Azimuth screws 17A, 17B corresponding to each locking piece 15A, 15B are screwed into each screw mounting piece 16A, 16B. Furthermore, each screw mounting piece 16A, 16B and each azimuth screw 17A,
A compression coil spring 18A is connected between the head of 17B and
18B is inserted in a compressed state to stabilize the position of each azimuth screw 17A, 17B.

A gear 19 is fixed to the front end of the support shaft 7 on the back side of the head support 5. Also, a through hole 20 is provided between this gear 19 and the head board 5.
A spring receiving plate 21 having a spring receiving plate 21 is disposed with the support shaft 7 inserted through the through hole 20 thereof. A compression coil spring 22 is inserted between the spring receiving plate 21 and the gear 19 in a somewhat compressed state.
A plate-shaped pinch roller pressing member 24, which also serves as a part of the head reversing drive mechanism 23, is mounted on the back side of the head support 5 so as to be slidable in the left and right directions, that is, to be able to reciprocate in parallel with the running direction of the magnetic tape. There is. As shown in FIGS. 3 and 4, this pressing member 24 has a rectangular opening 25, and a rack 26 is provided at the upper edge of the opening 25, and this rack 26 is engaged with the gear 19. This is what is being done. Further, the lower end of the pressing member 24 is folded back forward, and the folded portion 27 extends forward at a position below the heads 1A, 1B. A guide groove 28 that is long in the front-rear direction is formed in this folded portion 27 as shown in FIG. Furthermore, a spring 2 is provided between the pressing member 24 and the head support 5.
9 is hung, and this spring 29 always urges the pressing member 24 toward the neutral position.

The head support 5 is provided on the tape recorder main body board 4 so as to be movable forward and backward with the magnetic head 1A facing forward.

FIG. 5 shows the relationship between the pinch roller pressing member 24 and the pinch rollers 30A, 30B etc. attached to the tape recorder main body board 4. The pair of pinch rollers 30A, 30B are attached to the magnetic head 1A.
They are arranged symmetrically on both sides of the capstans 31A and 31B, respectively. These pinch rollers 30A, 30B are attached to shafts 32A, 32B.
Pinch roller support 33 that is rotatable about the fulcrum
A, 33B are pivotally supported, and as the supports 33A, 33B rotate, the corresponding capstans 31
It is configured to move toward and away from A and 31B.

A drive gear 3 is attached to the one capstan 31A.
2 are coaxially and integrally attached, and the drive gear 32 and capstan 31A are always driven clockwise in FIG. 5 by a motor (not shown). The other capstan 31B is always driven counterclockwise in FIG. 5 by the above-mentioned common motor.

A large gear 33 is arranged near the one capstan 31A. This large gear 33 is connected to the head reversing drive mechanism 23 together with the drive gear 32, the pinch roller pressing member 24, and a motor (not shown).
It has non-engaging parts 34A and 34B with some teeth missing at two symmetrical locations, and an eccentric pin 35 near the center on the top surface and a symmetrical pin near the outer periphery. and a pair of engagement pins 36A, 36B. The eccentric pin 35 is inserted into the guide groove 28 of the pinch roller pressing member 24.

In addition, 37 in FIG. 5 is an electromagnetic plunger, and a rotary lever 39 is attached to the movable part 38 of this plunger 37.
one end of which is engaged. A stopper pin 40 is provided at the other end of the rotating lever 39, and this stopper pin 40 is engaged with one engagement pin 36A.

Linear springs 41A, 41B are attached to each of the pinch roller supports 33A, 33B.

Next, the operation will be explained.

FIG. 5 shows the tape recorder in a stopped state, where the head support 5 and the magnetic head 1A are in the retracted position. Furthermore, the pinch roller pressing member 24 is in a position moved to the left. Therefore, a restoring force is applied to the pressing member 24 in the rightward direction by the spring 29, and therefore the large gear 33 is urged counterclockwise in the figure. The stopper pin 40 engages with one engagement pin 36A, and rotation of the large gear 33 is prohibited. At this time, one non-engaging portion 34A faces the drive gear 32, so the rotation of the drive gear 32 is not transmitted to the large gear 33.

For example, when a reproducing operation is performed from the state shown in FIG. 5, the head support 5 moves forward, and the magnetic head 1A
is brought into contact with the magnetic tape, and at this time, the left end of the pressing member 24 presses the linear spring 41A of the left pinch roller support 33A. Therefore, as the magnetic head 1A moves forward, the pinch roller support 33A rotates, and the left pinch roller 30A is pressed against the corresponding capstan 31A as shown by the imaginary line in the figure. At this time, the pressing force of the pinch roller 30A against the capstan 31A is given by the elasticity of the linear spring 41A. Therefore, the magnetic tape is held between the capstan 31A and the pinch roller 30A,
As the capstan 31A rotates, it travels to the left in the figure and performs a predetermined regeneration operation.

When the magnetic tape is pulled out to the end in this manner, a tape running direction switching signal is issued from a tape position detection device (not shown), and the head support 5 is thereby driven in the backward direction together with the pinch roller pressing member 24. Ru. At the same time, the electromagnetic plunger 37 is energized for a short time. As the pinch roller pressing member 24 retreats, the left pinch roller 30A separates from the left capstan 31A. Further, when the electromagnetic plunger 37 is energized, the rotation lever 39 is rotated, the stopper pin 40 is disengaged from the engagement pin 36A, and the large gear 33 is rotated slightly counterclockwise in FIG. 5 by the spring 29. Therefore, this large gear 33 meshes with the drive gear 32 and rotates under the rotational force of the drive gear 32, but when it rotates 180 degrees and the other non-engaging portion 34B faces the drive gear 32, the other Engagement pin 3
6B comes into contact with the stopper pin 40, and the large gear 33 stops again. Then, while the large gear 33 rotates 180 degrees, the pinch roller pressing member 24 presses the guide groove 2.
8 and the eccentric pin 35, it moves from the left position shown in FIGS. 3 and 5 to the right position shown in FIG. 4. At this time, the gear 19 rotates 180 degrees due to the movement of the rack 26, and together with this, the magnetic head 1A and the erasing head 1B are turned upside down. At this time, the spring 2 is attached to the pinch roller pressing member 24.
Since the elastic force 9 is acting to the left, the large gear 33 is urged counterclockwise in FIG.

From this state, the head support 5 is driven forward again and the magnetic head 1A comes into contact with the magnetic tape, but as the head support 5 moves forward, this time the right end of the pinch roller pressing member 24 Linear spring 41 of right pinch roller support 33B
Now press B. Therefore, magnetic head 1A
As the right pinch roller 30B moves forward, the right pinch roller 30B comes into pressure contact with the corresponding right capstan 31B. There, the magnetic tape is held between the right capstan 31B and the pinch roller 30B, and as the capstan 31B rotates, it travels to the right in FIG. 5, and then a predetermined reproduction operation is performed.

Note that switching from the rightward running state of the magnetic tape to the leftward running state is performed in the same manner.

In the auto-reverse device configured as described above, the rotating plate 3 is pressed against the head support 5 via the three steel balls 13 due to the elasticity of the compression coil spring 22, so that the rotating plate 3 is always maintained stably. be done. Therefore, the magnetic head 1A attached to the rotating plate 3 will not wobble. Also, since the steel balls 14 are interposed between the back surface of the head support 5 and the spring receiving plate 21, no torsional force is applied to the compression coil spring 22, and the rotational movement of the rotary plate 3 is smooth. It will be done. Furthermore, since the pinch roller pressing member 24 that selectively presses the pinch roller supports 33A and 33B is also used as part of the drive mechanism that turns the magnetic head 1A upside down, the configuration of the auto-reverse device is simplified. Further, since the pinch roller pressing member 24 is provided with a rectangular opening 25 and the upper edge of the opening 25 is provided with a rack 26 that meshes with the gear 19, the gear 19 is positioned inside the opening 25. I come to do it. Therefore, the lead wire 8 inserted through the support shaft 7 to which the gear 19 is fixed is connected to the gear 1.
9 and the rack 26 will not occur.

Note that the present invention is not limited to the configuration of the above embodiment. For example, the pinch roller pressing member may be rotatably provided on the head support. In this case as well, the magnetic head is turned upside down as the pinch roller pressing member moves forward and backward, and as the head support moves forward, one selected pinch roller is pressed against the corresponding capstan. shall be allowed to do so.

As described in detail above, in the tape recorder auto-reverse device according to the present invention, a head support is attached to the tape recorder main body board so that it can move forward and backward, and the magnetic head is supported on the head support so that it can be turned up and down. A pinch roller pressing member is attached to the head support so as to be reciprocally movable, the magnetic head is turned upside down as the pressing member moves forward and backward, and the pinch roller pressing member is attached as the head support moves forward. One of the pinch rollers selected in the above is pressed against the corresponding capstan, and thereby the pinch roller can be driven and the magnetic head can be turned upside down with a simple configuration. The desired effect can be achieved, such as by being able to

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a sectional view taken from FIG. 1, FIGS. 3 and 4 are rear views in different operating states, and FIG. FIG. 2 is a plan view showing the relationship between a slide plate, a pinch roller, and the like. 1A... Magnetic head for recording/playback, 4... Tape recorder main body board, 5... Head supporter, 19... Gear, 24... Pinch roller pressing member, 26... Rack, 30A, 30B... Pinch roller, 31A, 3
1B... Capstan, 33A, 33B... Pinch roller support, 41A, 41B... Linear spring.

Claims (1)

[Scope of Claims] 1. A head support body attached to a tape recorder main body board so as to be movable forward and backward; a pair of capstans and pinch rollers each symmetrically provided on both sides of the head support body; and the head support body. A magnetic head is supported by a magnetic head such that it can be rotated up and down; An auto-reverse device for a tape recorder, comprising a pinch roller pressing member that presses a selected pinch roller against a corresponding capstan as the body moves forward. 2. The auto-reverse device for a tape recorder according to claim 1, wherein the pinch roller pressing member has a rack in a part thereof, and a gear meshing with the rack is fixed to the magnetic head.