JPS59218652A - Action switching device of tape recorder - Google Patents

Abstract

PURPOSE:To attain miniaturization, light weight and small power consumption for a tape recorder by providing cams to switch the constant speed feed state and the stop state between the 1st and 2nd directions of a tape with a motor. CONSTITUTION:Cams 37 and 23 are revolved with the revolution of a motor 48 after pushing a constant feed switch of the 1st direction. Then a projected part 37b pressed a switch 40, and the revolution of the motor 48 are stopped. The 1st head substrate 10 moves forward by means of a cam groove 23a, and a rod 42 alos moves forward. A pinch roller 17 is pressed to a capstan 2 to drive a tape 59 toward an arrow A. Then the 1st record/reproduction head 13 and an erasion head 45 touch the tape 59. Then a constant speed feed switch of the 2nd direction is pushed, and therefore cams 37 and 23 are revolved and then stopped after pushing a switch 41. The 2nd head substrate 24 moves forward, and a pinch roller 31 is pressed to a capstan 3. Thus a tape 59 is driven toward an arrow B. When a stop switch is pushed, the motor 48 is revolved and stopped when a switch 39 is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation switching device for a reciprocating recording/playback type tape recorder.

In general, a reciprocating recording/playback type tape recorder basically requires three states. That is, the tape is in a constant speed feeding state in the first direction, a constant speed feeding state in the second direction, and a stopped state. Nowadays, many tape recorders use electrical switches in their operating sections to make operations easier. These normally use a plunger or the like to switch the mechanical parts. However, plungers require a large amount of electric power instantaneously, and are large and heavy.

For example, in order to achieve the three states mentioned above, two plungers are usually required, and since they must be constantly energized during operation, it is very uneconomical to drive them with batteries, etc., and they are extremely small. This is a major obstacle to reducing the size and weight of the product.

The present invention uses a single dedicated motor to switch the operation between three states: a constant speed feed state in the first direction of the tape, a constant speed feed state in the second direction, and a stop 1-state.
The present invention provides a device that is smaller, lighter, and consumes less power.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view in a stopped state. A first capstan 2 and a second capstan 3 are rotatably supported on a substrate 1,
A flywheel 4 is fixed to the first capstan 2, and a flywheel 6 is fixed to the second gearstan 3, and the belt 6 drives the tape running motor 7.
7a and the flywheels 4 and 5 are connected, so that when the motor 7 rotates clockwise, the flywheel 4 and the first capstan 2 rotate clockwise, and the flywheel 5 and the second capstan 3 rotate counterclockwise. It has become.

The first reel stand 8 and the second reel stand 9 are each rotatably mounted on the substrate 1. The first head substrate 10 is supported on the substrate 1- by shafts 11 and 12 so as to be slidable back and forth.

A pinch roller arm 15 is rotatably supported on the first head substrate 1o by a first recording/reproducing head 13 and a shaft 14. One end of the pinch roller arm 15 has a shaft 1 (J
C, the pinch roller 17 is rotatably attached. A tension spring 19 is applied to the other end 15a of the pinch roller arm 15 and the shaft 18 on the first head board 10.
Although the pinch roller arm 15 is biased counterclockwise around the support shaft 14, the shaft 20 on the first head board 10
Its position is regulated by knee 9. A shaft 21 is attached to the back side of the tip of the first head substrate 10, and this shaft 21 engages with a cam groove 23a of a gear cam 23 rotatably attached to the substrate 1- by means of 1111I22. On the other hand, the second head board 24 is attached to the base 25 on the board 1.
．． 26 so as to be slidable back and forth. The second head board 24'' has a second recording/playback head 27 and a shaft 2.
Pinch roller arm 2 rotatably supported by 8
A pinch roller 31 is attached to one end of the pinch roller arm 29 by a shaft 30.

A tension spring 33 is applied between one end 29a of the pinch roller arm 29 and the shaft 32 of the second head board 24'', and urges the pinch roller arm 29 in the opening direction about the support shaft 28. However, its position is restricted by the foot 34 of the second head board 24-1-.

A shaft 35 is attached to the back side of the tip of the second head substrate 24, and engages with a cam groove 37a of a gear cam 37 rotatably attached to the substrate 1 by a shaft 36. A switch 38 mounted on the board 1 switches the electrical circuit to the first
The slider 38a is a changeover switch that can be used for the second tape running direction or for the second tape running direction.
It engages with the notch 24 & of the head board 24, and the first
In the state shown, the electric circuit is set in the first running direction state.

The convex portion 37b on the outer periphery of the gear cam 37 is still facing the switches 39, 40, and 41 attached to the board 1''2, and in the stopped state shown in FIG. 1, the switch 39 is suppressed by the convex portion 37b. It is in. The rod 42 is the substrate 1.
- It is supported so as to be slidable back and forth on shafts 43 and 44.

An erasing head 45 is attached to the rod 42.

A tension spring 47 is applied between the shaft 46 on the rod 42 and the shaft 44 on the substrate 1, urging the rod 42 backward. The stepped portions 42a and 42b of the rod 42 each have a first
The engaging part 10 a part of the head board 10 and the second head board 2
It is engaged with the engaging portion 24b of No. 4.

A small gear 49 is attached to the rotating shaft of the operation switching motor 48, and is configured to drive the gear cam 37 via a gear 51 rotatably supported by a shaft 50 of the base plate 11-. The gear cam 37 and the gear cam 23 are connected by three gears 52, 53, and 54. gear 52
, 53, 54 are rotatably attached to the substrate 1'' by shafts 55, 56, 57, respectively. The number of teeth of the gear cam 37 and the number of teeth of the gear cam 23 are the same, and when the gear cam 37 rotates once, the gear cam 23 also rotates once in the same direction. The cassette tape case 58 and tape 69 are installed as shown.

FIG. 2 shows the relationship between the core portions of the first recording/reproducing head 13, the second recording/reproducing head 27, and the erasing head 45, and the tape 59, as seen from the tape 59 side. tape 6
9 travels in the direction indicated by the arrow in the first running direction, and at this time, the core section 13a of the first recording/reproducing head 13 and the core 'ft'I45d of the erasing head 45 are used to perform recording or reproduction. On the other hand, in the second running direction, the tape 59 runs in the direction of arrow B, and the core part 27a of the second recording/playback head 27 and the core part 45b of the erasing head 45 are used to perform recording and playback. . Note that this switching is performed by the switch 38.

FIG. 3 is a control block diagram of the operation switching motor 48. The switches 60, 61, and 62 are respectively a first direction constant speed feed operation switch, a second direction constant speed feed operation switch, and a stop operation switch. Circuit et al. 3, 6
4 is a memory circuit using a transistor flip-flop circuit, etc. After set inputs 63a and 64a are input, outputs 63c and 64c are kept ON, and when reset inputs +33b and 64b are input, outputs 63c and 64c are respectively turned on.
64a is turned off. However, the set inputs 63a and 64a have priority over the reset inputs 63b and 64b. The circuit 65 turns the motor 4 on when the input 65a is ON.
This is a switch circuit using a transistor or the like that rotates the motor 8 in the counterclockwise direction, and rotates the motor 48 in the clockwise direction when the input e5b is ON.

Note that the switches 39a, 39b, 39c, and 40d.

40b, 40c, 41a, 41b, and 41c correspond to the switches 39, 40, and 41 in FIG. 1, respectively, and the convex portion 37b
It turns ON when suppressed by .

Naoto's FIG. 3 corresponds to the stopped state shown in FIG. 1. Next, the operation will be explained. When the operation switch 60 for constant speed feed in the first direction is pressed and turned ON from the stopped state, that is, the state shown in FIGS. 1 and 3, an input is input to the cent manual power 63a of the memory circuit 63 through the switch 39a. , the output 63c is turned on, and the motor 48 is rotated in the open direction via the switch circuit 65. Then, the gear cam 37 similarly rotates clockwise via the gear 61, and the gear cam 23 similarly rotates clockwise via the gears 52, 53, and 54. As the gear cam 37 rotates, the protrusion 37b on the outer periphery moves away from the switch 39, and the switch 40 is operated to suppress it. At that time, the switch 40c is turned on, the memory circuit 63 is reset, and the output 63c is turned off. Therefore, the switch circuit 66 is turned off and the motor 48 is stopped. This state is shown in FIG. 4, where the gear cams 37 and 2
3 is a state rotated approximately 1200 degrees clockwise from FIG. The first head substrate 10 is moved forward due to the shapes of the cam grooves 37a and 23a. Along with this, the rod 42 also moves forward. However, the second head substrate 24 is in the same position as in the stopped state in FIG. As the first head substrate moves forward, the pinch roller 17 is pressed against the capstan 2 by the force of the spring 19, and the tape 59 is driven in the direction of arrow A. Further, the first recording/reproducing head 13 and the erasing head 45 are in contact with the tape 59. Although not shown, the first reel stand 8 winds up the tape 59 using part of the rotational force of the motor 7 in conjunction with the first head substrate 10.

When the operation switch 61 for constant speed feed in the second direction is pressed and turned on from this state, that is, the constant speed feed state in the first direction, the switch 40 is turned on this time, so 4Oa
The memory circuit 63 is turned on through the switch, and the motor 48 rotates clockwise again. Then, as before, the gear cam 37゜1゜23 rotates in the opening direction, and when it has rotated about 1200 times, the switch 41 is pressed.
C turns ON, the memory circuit 63 turns OFF, and the motor 48
stops. This state is shown in FIG. Due to the shape of the cam grooves 23a and 37a, the second head substrate 24 moves forward, and the first head substrate 10 is returned to the same position as in the stopped state. - The rod 42 is moved forward again by the second head substrate 24. In this state, the pinch roller 31 is pressed against the capstan 3 by the spring 33, and the tape 59 is driven in the direction of arrow B. The second recording/reproducing head 27 and the erasing head 45 are in contact with the tape 59. Although it is not shown in the diagram, the second
In conjunction with the movement of the head board 24, the second reel stand 9 winds up the tape 69 using part of the rotational force of the motor 7. Since the notch 24a of the second head substrate 24 also moves forward, the slider 38a of the switch 38 is moved to switch the electric circuit to the second direction. This state is a constant speed feeding state in the second direction. When the constant speed feed switch 60 in the first direction is pressed and turned ON from this state, since the switch 41 is pressed and the switch 41a is turned ON in the state shown in FIG.
is turned on, and the motor 48 now rotates counterclockwise. As a result, the motor 48 rotates until the protrusion 37b of the gear cam 37 presses the switch 40, at which point the motor 48 is stopped by the action of the switch 40c, resulting in a constant speed feed state in the first direction shown in FIG. .

On the other hand, when the stop operation switch 62 is pressed and turned on from the state shown in FIG. 6, that is, from the constant speed feed state in the second direction, since the switch 41 is pressed in the state shown in FIG. is turned ON), the motor 48 rotates clockwise to rotate the gear cam 37.23 clockwise, and the motor 4 continues until the switch 39 is pressed.
8 rotates, and the motor 48 is stopped by turning on the switch 39c, resulting in the stopped state shown in FIG.

In this embodiment, the operation is switched using the two gear cams 23 and 37, but these two gear cams may be integrated.

As described above, according to the present invention, when one or more interlocking rotating cams take three positions, and the respective positions are the first position, the second position, and the third position, the respective positions Correspondingly, the operating state of the tape recorder is set to constant speed tape feed in the first direction, constant speed tape feed in the second direction, and stop state, and at any position, direct switching to the other two positions is possible. Since this rotating cam is rotated by the rotational force of a motor, it is smaller, lighter, and has a reciprocating operation unit that consumes less power than a device that uses a pusher or the like for switching. It is possible to realize a tape recorder with a light electric switch, and its practicality is outstanding.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the present invention in a stopped state, Fig. 2 is a front view showing the relationship between the tape and each head, Fig. 3 is a control block diagram of the operation switching motor, and Fig. 4 is a Plan view of constant speed feeding state in the first direction, No. '1'5. ．． The figure is the second
FIG. 3 is a plan view of a constant speed feeding state in the direction of FIG. 13 1... Board, 2,3... Capstan,
7...Motor, 10.24...Head board, 23.37...Gear cam, 23a, 37
a...Cam groove, 37b...Protrusion, 39
,40.41...switch, 48...motor. Name of agent: Patent attorney Toshio Nakao and 1 other person-3
03-'

Claims (1)

[Claims] One or more interlockingly rotating cams are provided, and each of the cams has three positions, each of which is a first position, a second position, and a third position. The operating state of the tape recorder is configured such that the operating state of the tape recorder is fixed-speed tape feeding in a first direction, constant-speed tape feeding in a second direction, and stopped state in accordance with the position, and at any position of the cam, 1. An operation switching device for a tape recorder, characterized in that the cam can be directly switched between two positions, and the cam is rotated by the rotational force of a motor.