JPS626594Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a method for mode switching in a tape recorder.
That is, it relates to a device for switching operation modes such as play, fast forward, and rewind.

Conventionally, methods for switching the operation mode include the direct method, in which the operating lever is manually moved and the transmission force is used to drive the mechanical part, and the switch-touch method, in which the solenoid is driven by a switch operation to drive the mechanical part. There is.

However, among the above-mentioned methods, the direct method has a very complicated operation mechanism, which poses a risk of failure and is also heavy. Also, the switch-touch type has a simpler mechanism and fewer failures than the direct type mentioned above, but in order to operate multiple control levers independently, it requires the same number of solenoids for the levers, which increases the cost. At the same time, the weight is also large, and the operation is limited to a single operation by turning on and off a solenoid, making it impossible to perform complicated operations.

This idea was created in view of the above points,
The purpose of this is to
By attaching each member for switching the operation mode to the holding board, the same holding board can be manufactured, and therefore only one mold is required, making it possible to create a mode switching device for a tape recorder that can be manufactured at low cost. It is on offer.

Next, an embodiment of the present invention will be described with reference to the drawings.

1 is a first holding board made of aluminum, and a number of holes are formed in the necessary locations, and these holes are outsert processed (metal is inserted during resin molding and integrated).
Four pillars 1a, one rotating bearing 1b, and three fixed bearings 1c are formed by a processing method that is the reverse of the so-called insert processing, in which a resin material is injected into a metal plate and integrated. There is. 2 is the above rotation bearing 1
b is a disc-shaped control plate made of synthetic resin, on which the rotating shaft 2a is supported, and an E washer 2b is inserted on the back side to prevent it from coming off.A gear 2c is formed on the outer periphery, and a stopper/positioning protrusion 2 is provided.
d is formed. Also, the rotating shaft 2a of the control board 2
A hole 2e into which a rotating shaft 12a of a potentiometer 12, which will be described later, is fitted is formed on the opposite side surface to which the potentiometer 12 is fixed. Furthermore, two cam portions 2f and 2 are provided on the front and back surfaces of the control plate 2, respectively, as shown in FIGS. 5a and 5b.
g, 2h, and 2i are formed. Reference numeral 3 denotes a gear plate inserted into a fixed shaft 1d fitted to a central fixed bearing 1c, forming two gears 3a and 3b, and a metal plate 3c is pasted on the top surface to prevent gear noise. It is worn. The gear 3a is meshed with the outer gear 2c of the control plate 2.

4 is a fixed shaft 1 fitted into a fixed bearing 1c on one side.
The eject control lever is inserted into the eject control lever, and the tip protrusion 4a is in sliding contact with the outer periphery of the cam part 2g on the control plate 2, and the other end operating part 4b is protruded outward from the holding board 1. There is. Reference numeral 5 denotes a pinch roller control lever inserted into the fixed shaft 1d before the gear plate 3, the protruding end 5a of which slides on the outer periphery of the cam part 2h of the control plate 2, and the other end operating part 5b. protrudes outward from the holding substrate 1. A spring 6 is stretched between the pinch roller control lever 5 and the holding base plate 1, so that the protrusion 5a is always in sliding contact with the cam 2h. Reference numeral 7 denotes a head base control lever inserted into the fixed shaft 1f fitted to the fixed bearing 1c on the other side, and the tip protrusion 7a is connected to the cam part 2i of the control plate 2.
The other end of the operating portion 7b is projected outward from the holding substrate 1. A spring 8 is stretched between the head base control lever 7 and the holding base plate 1, so that the protrusion 7a is always in sliding contact with the cam portion 2i. Reference numeral 9 designates a brake control lever inserted into the fixed shaft 1f, the protruding end 9a of which slides on the outer periphery of the cam portion 2f of the control plate 2, and the operating portion 9b of the other end protruding outward from the holding base plate 1. has been done. A spring 10 is tensioned between this brake control lever 9 and the eject control lever 4, so that the protrusions 4a, 9a of both levers 4, 9 are constantly held in place by the cam portions 2g, 2.
f is in sliding contact.

Reference numeral 11 denotes a second holding board made of the same parts as the above-mentioned holding board 1, and the above-mentioned fixed shafts 1d, 1e, 1f.
The fixed bearings 11a, 11b, and 11c that bear the same, the mounting portion 11d of the potentiometer 12, and the mounting portion 11e of the motor 13 are formed by outsert processing as in the case of the holding board 1 described above.
Further, on the upper surface of the holding substrate 1, a potentiometer mounting base 14 having an elongated hole 14a is provided.
It is installed using. Since the potentiometer 12 is fixed to this mounting base 14,
The potentiometer 12 is attached to the holding substrate 11 with the rotating shaft 12 facing downward. Further, the motor 13 is also mounted with the rotating shaft 13a facing downward. Note that a small gear 13b is fixed to the rotating shaft 13a.

Here, when the second holding board 11 is attached to the column 1a with the control plate 2 rotated to a predetermined position and the rotation shaft 12a of the potentiometer 12 also rotated to a predetermined position, the rotation shaft 12a is fitted into the hole 2e of the control board 2, and the small gear 13b of the motor 13 is meshed with the gear 2c of the control board 2. Therefore, when the motor 13 is energized, the control plate 2 is rotated, so the rotating shaft 12a of the potentiometer 12 is rotated, and the resistance value is changed. 15 is each operation part 4b, 5b, 7 of each control lever 4, 5, 7, 9
The chassis plate is attached to the first and second holding substrates 1 and 11 on the b and 9b sides using the struts 1a, and the windows 15a to 15c facing each of the operation parts 4b, 5b, 7b, and 9b are the movable ranges. It is formed over the entire length.

Next, the block diagram of FIG. 6 will be explained.

A is a drive circuit for the motor 13, and the input terminal receives various mode signals (eject, fast forward, rewind, queue, review (fast forward, rewind state), and when the head is in sliding contact with the tape, When the pause and play signals (used to detect non-track portions) are input, a reference voltage generator _A1 for driving the motor 13 sends out different output voltages corresponding to each mode, and a fast forward signal is sent to the input terminal. A reel motor that outputs high-level or low-level voltage when a rewind or play signal is input.
Compare the output from the drive reference voltage generator A ₂ of C ₂ with the output from the reference voltage generator A ₁ and the output from the potentiometer 12 whose resistance value changes as the motor 13 rotates, and determine if there is a difference. Comparator A ₃ sends out a high or low level output when
, a direction switching circuit A ₄ which turns on according to the output from the comparator A ₃ and rotates the motor 13 in forward and reverse directions; and an amplifier A ₅ which amplifies the output from the reference voltage generator A ₂ . , one of them is turned on by the output from the amplifier _A5 , and the reel motor is turned on.
It is composed of a direction switching circuit A ₆ that rotates C ₂ in forward and reverse directions. B is the mode switching device described above, and the motor 13 is rotated by the output from the direction switching circuit _A4 . Note that the same reference numerals as in FIGS. 1 to 5 indicate the same members, and explanations thereof will be omitted. C is driven by various switching levers 4, 5, 7, and 9 to open the cassette holder, press the pinch roller to the capstan, advance the head base so that the head slides into contact with the tape, and press the brake pad to the reel stand. Mechanism part C ₁ for rotating the reel, and reel motor C ₂ for rotating the reel stand in the forward or reverse direction.
It is composed of.

Next, to explain the operation based on the above configuration,
If a cassette is now loaded into the tape recorder main body (not shown) and the tape recorder is in the stopped state, the motor 13 will not be driven, and therefore each operating section 4b, 5b, 7b, 9b of each control lever 4, 5, 7, 9 will be in a stopped state. is in the position shown in Figure 5a. In this state, no action is taken on the mode switching brake operating arm, eject operating arm, head base operating arm, and pinch roller operating arm provided on the tape recorder main body side. In this state, the brake operating arm presses the brake pad against the reel stand.

Next, when the fast-forward switch is closed to perform a fast-forward operation, a signal is transmitted to the fast-forward input terminal of the reference voltage generator _A1 , and a predetermined voltage is output from the reference voltage generator _A1 . . As a result, the comparator _A3 sends out a high level output, and the direction switching circuit _A4 sends out an output that rotates the motor 13 in the forward direction. Therefore, the motor 13 starts to rotate forward, causing the control plate 2 to rotate forward. As the control plate 2 rotates in the forward direction, the stop cam part 2f rotates the brake control lever 9, so the operating part 9b of the lever 9 is displaced (Fig. 5b), and the brake of the mechanism part _C1 is moved. Drive the operating arm and release the brake pad from the reel stand. Furthermore, as the potentiometer 12 is rotated as the control board 2 rotates, the voltage at one input terminal of the comparator A3 changes, and finally reaches the same level as the voltage at the other input terminal, and the voltage at one input terminal of the comparator _A3 changes. A ₃
Output from is stopped. As a result, the motor 13
rotation is stopped, and the reel stand is stopped in a rotatable state. On the other hand, since the fast forward signal is also input to the reference voltage generator _A2 , a high level output is sent out from the reference voltage generator _A2 . Therefore, the direction switching circuit _A6 sends out an output that rotates the reel motor _C2 in the forward direction, so that the tape is fast-forwarded.

Next, when the rewind switch is closed to perform a rewind operation, the reference voltage generator A ₁ and
A signal is sent to A ₂ . However, at this time, the reference voltage generator _A1 does not change at all, and therefore the mode switching device B does not change. Meanwhile reference voltage generator A ₂
changes its output and sends out a low level signal, so the direction switching circuit _A6 reversely rotates the reel motor _C2 . This causes the tape to be rewound.

Next, when the queue and review operations are performed during the fast forwarding and rewinding operations, the output from the reference voltage generator _A1 goes to a higher level than during the fast forwarding and rewinding operations, and therefore the output from the comparator _A3 becomes higher level. Output is sent. As a result, the motor 13 is rotated in the forward direction via the direction switching circuit _A4 , thereby rotating the control plate 2. When the control plate 2 is rotated, the pinch roller control lever 5 and the head base control lever 7, excluding the brake control lever 9 and the eject control lever 4, are driven by the cam portions 2h and 2f.
The actuators 5b and 7b are therefore displaced to an intermediate position (FIG. 5c), controlling the pinch roller actuating arm and the head base actuating arm, bringing the pinch roller closer to the capstan and sliding the head onto the tape.
This allows the head to come into sliding contact with the tape during fast forwarding and rewinding of the tape, making it possible to detect between tracks. Further, in the above, the output of the potentiometer 12 eliminates the output of the comparator _A3 , and the motor 13 stops.

Next, when the pause switch is turned on to enter the pause state, the reference voltage generator _A1 sends out a high level output, and the comparator _A3 sends out a higher level output than in the queue and review operations. As a result, the motor 13 is rotated in the forward direction via the direction switching circuit _A4 , so the control plate 2 is rotated, and the brake control lever 9 and the head base control lever, excluding the eject control lever 4 and the pinch roller control lever 5, are rotated. The lever 7 is driven by the cam parts 2f and 2i. Therefore, the operating section 9b retreats to its original position, and the operating section 7b moves forward further (Fig. 5d), controls the brake operating arm and the head base operating arm, presses the brake pad onto the reel stand, and moves the head base forward. . At this point, the reel stand is forcibly stopped and the power to the reel motor is cut off. Further, the output of the potentiometer 12 eliminates the output of the comparator _A3 , and the motor 13 stops. Therefore, the rotation of the reel stand stops with the head in sliding contact with the tape, and the pinch roller is separated from the capstan, resulting in a pause state.

Next, when the place switch is turned on to enter the play state, the reference voltage generator _A1 sends out a high level output, and the comparator _A3 sends out a higher level output than the pause operation. As a result, the motor 13 is rotated in the forward direction via the direction switching circuit _A4 , so the control plate 2 is rotated to control the brake control lever 9 and the pinch roller, excluding the eject control lever 4 and the head base control lever 7. lever 5 is driven by cam portions 2f and 2h. Therefore, the operation parts 9b and 5b are as shown in FIG. 5E.
The brake pad is moved away from the reel stand via the brake operating arm, and the pinch roller is pressed onto the capstan via the pinch roller operating arm. At the same time, potentiometer 1
With the output of 2, the output of comparator A ₃ disappears and motor 1
3 stops. On the other hand, an output is sent from the reference voltage generator _A2 , and the reel motor is rotated in the forward direction via the direction switching circuit _A6 . Therefore, the play operation is started.

Next, the operation for ejecting will be explained. First, when the stop switch is turned on, a low level output is sent out from the reference voltage generator _A1 , and a low level output is sent out from the comparator _A3 . As a result, the motor 13 is rotated in the opposite direction via the direction switching circuit _A4 , so that the control plate 2 is rotated in the opposite direction, and the pinch roller control lever 5, brake control lever 9, and head base control lever 7 are rotated in the cam portions 2h and 2f. and 2i, it is returned to its original position in FIG. 5a. Therefore, the operating section 5b separates the pinch roller from the capstan via the pinch roller operating arm, the operating section 9b presses the brake pad against the reel base via the brake operating arm, and the operating section 7b moves the pinch roller away from the capstan via the head base operating arm. to move the head base back. At the same time, the output of the potentiometer 12 eliminates the output of the comparator _A3 , and the motor 13 stops. The tape recorder is therefore in a stopped state.

When the ejection switch is operated, the reference voltage generator _A1 sends out a lower level output than during the stop operation, and the comparator _A3 sends out a lower level output. As a result, the motor 13 is rotated in the opposite direction via the direction switching circuit _A4 , and the control plate 2 is also rotated in the opposite direction. As a result, only the eject control lever 4 is displaced by the cam portion 2g (FIG. 5f), and the operating portion 4b operates the cassette holder release arm. The cassette holder is then opened. In the above, before opening the cassette holder, if a protrusion (not shown) is formed on the cam part 2f and the brake control lever 9 is driven once to separate the brake pads from the reel stand, the tape will be in a tensioned state. Even if the cassette is removed, the tape will loosen, thus making it easier to eject the cassette.

As described above, the present invention includes a motor, a control plate rotated by the motor, and a control lever controlled by the control plate and displaced to change the operation mode of the tape recorder. Since it is composed of two holding substrates that hold each of these members in a predetermined position, and these two holding substrates are made of the same material, only one mold is required for manufacturing the holding substrate. This has the advantage of reducing manufacturing costs and facilitating parts management.

[Brief explanation of the drawing]

The figures show an embodiment of the mode switching device in a tape recorder according to the present invention, in which Fig. 1 is an exploded perspective view, Fig. 2 is a plan view with the second holding board removed, and Fig. 3 is the second holding board. FIG. 4 is a rear view of the board, FIG. 4 is a central vertical sectional view, FIGS. 5 a to 5 are front views, and FIG. 6 is a motor drive circuit. 1... First holding board, 2... Control board, 4, 5,
7, 9... Control lever, 11... Second holding board,
13...Control motor.

Claims (1)

[Scope of utility model registration request] a control motor driven by an operation mode selection switch and driven by a predetermined amount corresponding to the switch; a control plate rotated by the control motor and formed with a plurality of cam portions having a desired shape; , a plurality of control levers provided at least in number equal to the number of cam parts, each of which abuts against the cam part of the control plate and is displaced as the control plate rotates, and a bearing support between the control plate and the control lever; and first and second holding boards having substantially the same shape with the control motor mounted on the outer surface thereof, and each control lever is individually driven in accordance with the rotation of the control plate to switch the operation mode. A mode switching device for a tape recorder, characterized in that: