JPS5948457B2 - cassette tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette tape recorder such as an auto-reverse type, which uses a simple mechanism to transition to a playing state.
The purpose of this is to lock the performance state and switch the tape running direction.

FIG. 1 shows an example of a cassette transfer method in a cassette tape recorder. In the process of arrows a and b, the cassette is inserted into the tape recorder and is in a playing state.
Various cassette transfer mechanisms have been proposed in which the cassette is ejected from the same recorder in the steps c and d, which are opposite to b. For example, U.S. Patent No. 4,071,860
In the mechanism described in the specification, ejection is performed by pushing a push button (push button for ejecting) in the direction of the magnetic head, but a spring is applied in the opposite direction (the direction in which the pinch roller is pressed). Because the button is pressed, the push button must be pressed with a force that exceeds the spring force.

If only a solenoid (electromagnetic plunger) is used to press the pinch roller onto the capstan, ejection will be easier, but the solenoid must be kept in operation during the performance period, and it requires a large capacity. It is necessary to use a solenoid, which makes it difficult to miniaturize the tape recorder and has the disadvantage of increasing power consumption. The present invention eliminates these drawbacks and will be described below with reference to an embodiment shown in FIGS. 2 to 6.

Here, FIG. 2 shows the overall deck configuration, and FIGS. 3 and subsequent figures are partial views of the FF, . U.S. Patent No. 40 shown above except that the REW buttons 1 and 2 are made independent from the eject button 3.
It has almost the same mechanism as the specification of No. 71860. However, the major difference is that the solenoid 4 for track switching is also used for the pinch roller and the head for pressing the capstan and tape.

This point will be explained below using FIGS. 3 to 6. When the shaft of the solenoid 4, that is, the plunger 5, is attracted, the suction force is transmitted to the pinch roller switching plate 7 through the crank 6, and the pinch roller switching plate 7 rotates.
Each time the solenoid 4 operates, the running direction of the tape is switched. The crank 6 is provided with a hole 9 in which an engaging portion 91 that engages with the pin 8 provided on the plunger 5 and an elongated hole portion 92 are formed in an L-shape. reference). When the head mounting plate 13 etc. is moving in the force setting direction (during performance), the pin 8 engages with the engaging part 91 of the hole 9 as shown in Figure 6, and at other times, the pin 8 engages with the engaging part 91 of the hole 9. 6th in part 92
I am trying to correspond as shown in the figure. 11 is a shaft provided on the head mounting plate 13, and 10 is a spring stretched between the crank 6 and the shaft 11. When the head mounting plate 13 moves to the playing position, the crank 6 follows and moves. As shown in FIG. 6, the pin 8 of the plunger 5 engages with the engaging portion 91 of the crank 6.

14 is a drive piece in which a long hole into which the pin 8 is inserted is formed.

The solenoid 5 is connected to the head 1 as shown in FIG.
A head mounting plate 13 to which 2 is attached is connected via a drive piece 14 and a rotary plate 15. The drive piece 14 is a spring 16
The solenoid 4 is pulled in the opposite direction by the solenoid 4. 17
18 is an electromagnet for holding, and 18 is a holding piece rotatably supported around a shaft 19. This holding piece 18 has an adsorption part 181 that is attracted to the electromagnet 17 and a stopper part 182 for the rotating plate 15. , is pulled counterclockwise by a spring 20.

Here, when the solenoid 4 operates, the plunger 5 is attracted in the direction of the solenoid 4, and therefore the drive piece 14 is also driven in the direction of the solenoid 4.

Therefore, the rotary plate 15 rotates from the state shown by the dotted line in FIG. 4 to the state shown by the solid line, and the head mounting plate 13 is moved. Although the pinch roller is not shown, the head mounting plate 1
3 moves close to the capstan, and only the pinch roller on the side selected by the pinch roller switching plate 7 shown in FIG. 6 is pressed against the capstan. FIG. 5 shows the electrical system including the solenoid 4 and the electromagnet 17, where 21 is a motor that drives the capstan 22 and reel shaft 29 shown in FIG. 1, 23 is a manual track changeover switch, and 24 is a tape running switch. This is a switch that is turned on when the tape is stopped.The details are omitted, but the tape running state may also be monitored by the rotating state of the winding shaft.
The tension of the tape may also be monitored.

25 is a switch that is turned off during FF and REW, and is turned off instantaneously when push button 1 or 2 in FIG. 2 is pressed.

26 is a switch that is turned on when the power set is set to the playing state.

Next, the operation will be explained.

In order to set the force set to the playing state, use the force set guide 2.
7 and push the force set detection piece 28, the force set moves in the direction of the reel shaft 29 and the capstan 22, and is set to the playing state. On the other hand, at this time switch 26
Since the motor 21 is turned on, the motor 21 starts rotating.

Although not shown, by turning on this switch 26,
The amplifier circuit and the like may also be put into operation. When the motor 21 starts rotating, the force setting tape is not running, so the switch 24 is on, the solenoid 4 operates, and the plunger 5 is pulled. Therefore, the driving piece 14
, the head mounting plate 13 is moved in the force setting direction through the rotary plate 15, and the playing state is entered. Along with this, the switch 24 is turned off in order to start running the tape.
Although the operation of the solenoid 4 is stopped, since the holding piece 18 is attracted by the electromagnet 17, the rotary plate 15 is locked in the state shown by the solid line in FIG. 4 by the stopper portion 182 of the holding piece 18. Therefore, the playing state continues.

Note that during the process of setting to the playing state, the plunger 5
The pin 8 corresponds to the elongated hole 92 as shown in FIG. Therefore, the playback surface (A or i) that was being played before the switch 26 was turned off
Side B) will then be played. Next, a case where the switch 24 or 23 is turned on while playing side A will be explained.

In the regenerating state, the head mounting plate 13 is kept moved in the force setting direction, and the crank 6 moves following the head mounting plate 13 and is kept in the state shown in FIG. 6. Therefore, the pin 8 provided on the plunger 5 is engaged with the engaging portion 91 as shown in FIG. Here, when the solenoid 4 is activated by turning on the switches 24 and 23, the pinch roller switching plate 7 is rotated in order to pull the crank 6, and the pinch roller that was running on the A side is separated from the corresponding capstan 22, and the pinch roller is moved away from the corresponding capstan 22. The pinch rollers to be run on the B side are pressed against the corresponding capstans 22.

Therefore, side B is played back and switches 23,2
4 is turned on again, the mode is switched to side A playback. By the way, in the process of playing side A or B, if push buttons 1 and 2 for FF or REW are pressed, switch 2
5 is turned off, during which the operation of the electromagnet IT stops.
Along with this, the holding piece 18 is released, so that the spring 20
When affected by the action of , the rotary plate 15 returns from the solid line state in FIG. 4 to the dotted line state. Along with this, the head mounting plate 13
Since the tape is returned, the pinch roller in the pressed state is separated from the capstan, and the head 12 is also separated from the tape, and FF and REW of the tape are performed.

When FF or REW is applied and switch 24 is turned on (switch 25 is already turned on)
The plunger 5 operates first to set the tape in the direction in which FF or REW is applied.

Subsequently, at this stage, the tape is moving in one direction, the switch 24 is on, and the plunger 5 is turned on.
is operated again to perform track switching through the crank 6. When ejecting, by pressing pushbutton 3, switch 25 is first turned off, and then power is set to the first position.
Since the switch 26 shown in FIG. 5 is turned off in the process of c in the figure, there is no need for force to restore the head 12 including the head mounting plate 13 and the pinch roller, and the force setting detection piece 28
The force required to push it out is good enough.

As described above, in this embodiment, when the plunger 5 is attracted by the solenoid 4, this suction force is transmitted to the head mounting plate 13 via the drive piece 14 and the rotary plate 15, and the head mounting plate 13 is moved to the playing position. will be moved.

Further, as the head mounting plate 13 moves, the pinch roller is driven by the head mounting plate 13, and the capstan 22
is touched and enters the playing state. Further, as the head mounting plate 13 moves, the holding piece 18 rotates, and the suction portion 181 of the holding piece 18 is attracted by the electromagnet IT. Therefore, even when the plunger 5 returns, the head mounting plate 13 does not return, and the head mounting plate 13 is held at the playing position by the attraction force of the holding piece 18 by the electromagnet 11. Further, in the process of moving the head mounting plate 13 to the playing position by the plunger 5, the crank 6 changes from the state shown in FIG. 6C to the state shown in FIG. The pin 8 of the plunger 5 engages with the engaging portion 91 of the hole 9 of the crank 6. In the above performance state, when the solenoid 4 operates again and the plunger 5 is sucked, the crank 6 is driven, and the pinch roller switching plate T is rotated clockwise or counterclockwise by the crank 6. The running direction of the tape is switched.

In this way, in this embodiment, the head mounting plate 13 is held at the performance position not by the solenoid 4 but by the small electromagnet 17 with a small capacity, so that the force setting type tape recorder can be downsized, and Power consumption is reduced. Furthermore, in this embodiment, one solenoid 4 is used to move the head mounting plate etc. to the performance position and to switch the tape running direction, so the mechanism is simplified. Further, as the head mounting plate 13 moves, the plunger 5 and the tape running direction switching mechanism can be automatically connected, which has the advantage of simplifying the switching mechanism. The present invention has the above configuration, and according to the present invention, the following effects can be obtained.

(The holding mechanism that holds the head mounting plate etc. in the playing position is smaller and consumes less power.)

J(2) The mechanism becomes simple, and the force setting type tape recorder can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a movement process diagram of the force set, Fig. 2 is a perspective view of a force set type tape recorder according to an embodiment of the present invention, Figs. 3 and 4 are detailed views of the main parts, and Fig. 5 is a solenoid. Figure 6A is a detailed view of the main parts, and Figures 6A and 6C are diagrams of its operating state. 5...Plunger, 6...Crank,
7... Pinch roller switching plate, 8... Pin, 9... Hole, 12... Magnetic head,
13... Head mounting plate, 14... Drive piece, 15... Rotating plate, 17... Electromagnet, 18... Holding piece, 23, 24... Switch.

Claims (1)

[Claims] 1. A transfer mechanism coupled to the plunger of the solenoid to transfer the magnetic head and the pinch roller to the performance position, a holding piece that moves following the transfer mechanism, and a holding piece that attracts the holding piece and A cassette type comprising an electromagnet that holds the transfer mechanism in a playing state, and a tape running direction switching mechanism that moves following the transfer mechanism, engages the plunger, and switches the tape running direction by the attraction force of the plunger. Tape recorder. 2. A transfer mechanism is formed by a drive piece that engages with the pin of the plunger, a rotating plate coupled to this drive piece, a head mounting plate coupled to this rotating plate, and a pinch roller driven by this head mounting plate. A cassette tape recorder according to claim 1, comprising: 3. A crank in which an L-shaped hole is formed, consisting of an engaging part with which the plunger pin engages and an elongated hole part into which the pin is inserted, and the crank rotates clockwise or counterclockwise. A cassette type tape recorder according to claim 1 or 2, wherein a tape running direction switching mechanism is constituted by a pinch roller switching plate.