JPH0142827Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette tape recorder, and more particularly to a structure for preventing erroneous recording of a cassette tape.

Conventionally, the detection claw is linked to the movement of the head stand, and if the detection claw enters the window where the cassette's erroneous recording prevention claw is formed, the interlocking operation with the head stand is abnormal. Sometimes, the detection claw may become caught in the window, making it difficult to eject the cassette. In addition, the detection timing sometimes shifted.

The purpose of this invention is to solve the above technical problems,
To provide a cassette tape recorder which operates independently of a head stand when the cassette is set at a predetermined position so as not to affect the cassette in any way.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a simplified plan view of one embodiment of the present invention, FIG. 2 is a side view seen from the arrow A side in FIG. 1, FIG. 3 is a bottom view, and FIG. The figure is a side view seen from the arrow B side in Figure 1, Figure 5 is a front view seen from the arrow C side in Figure 1, and Figure 6 is a side view seen from the arrow D side in Figure 1. FIG. The reel motor 10 is connected to the reel stand 1 via a switching mechanism.
2 and 14, and thereby the tape fed in the forward or reverse direction is wound onto the reel on the reel stand 12 or the reel on the reel stand 14. The switching mechanism includes a rubber belt 1 shown in FIG.
0a, a pulley 10b, a gear 10c, and a gear 10e attached to a swingable gear holder 10d.
10f, etc., and when the gear 10f meshes with the peripheral gear portion of the reel stand 12 or 14, the switching operation is performed. motor 18
is the flywheel 20 via the rubber belt 24.
a, 22a, thereby forming a pair with the flywheels 20a, 22a.
2 is rotationally driven. Pinch rollers 26, 28
is attached to the head stand 30 via an arm, and moves toward and away from the capsters 20 and 22, respectively. For example, when the reel stand 12 is on the winding side, the pinch roller 26 is pressed against the capstan 20 through the tape, and when the reel stand 14 is on the winding side, the pinch roller 28 is pressed against the capstan 22 through the tape. The lever 34, head stand 30, lever 36, etc. perform this switching operation.

Referring to FIG. 7, which shows only the essential parts of FIG. 1 in a simplified manner, an endless timing belt 40 having a slip groove on its inner surface is wound around pulleys 42 and 44. As shown in FIG. When solenoid 46 is energized, arm 4
8 rotates in the direction of arrow F1, the gear 18a attached to the output shaft of the motor 18 and the idler and reduction gear group 50 mesh, and the pulley 42 is rotated by the motor 18.

A holder 52 is fixedly hooked to the timing belt 40 at a portion 52a. The holder 52 is fitted into a pair of guide rods 56 and 58 that are arranged parallel to each other along the cassette insertion direction F4, and is guided by these guide rods 56 and 58 to move the cassette along the insertion direction F4. It is movable in forward and reverse directions. An engaging pawl 54 capable of engaging with a cassette is pivotally supported on the holder 52, and this engaging pawl 54 is biased by a spring (not shown) so as to protrude in the direction of engaging with the cassette. The amount of protrusion of this engaging claw 54 is determined by the amount of protrusion of the cam plate 60 arranged below the holder 52.
is restricted by a pin 54a that is always in contact with the cam surface 60a of the cam surface 60a.

A lever 62 is rotatably provided in the middle of the insertion direction F4 in the cassette accommodating portion 90.
This lever 62 rotates when a portion of the cassette is inserted into the cassette accommodating portion 90, thereby making the switch 66 conductive. The motor 18 is thereby energized. Further, during ejection, when the cassette has been ejected to some extent, the lever 62 releases the conduction state of the switch 66.

The cassette storage section 90 includes a cassette support stand 68,
70 is a spring 72 as shown in FIGS.
It is raised in an inverted V-shape. These cassette supports 68, 70 become horizontal when the cassette is pushed down by the restraining spring plate 74 during insertion of the cassette.

At the insertion end of the cassette accommodating section 90,
An erroneous recording prevention mechanism 100 is provided on the side edge opposite to the position where the timing belt 40 described above is arranged. This erroneous recording prevention mechanism 100 detects the presence or absence of an erroneous recording prevention claw on the cassette when insertion of the cassette is completed, and prohibits the recording operation when the erroneous recording prevention claw is not detected.

8 is a plan view showing the erroneous recording prevention mechanism 100, FIG. 9 is a front view of FIG. 8, and FIG. 10 is a left side view of FIG. 8. Misrecording prevention mechanism 10
0 includes a solenoid 102, a plunger 104 driven by the solenoid 102, and a pin 106 fixed at right angles in the middle of the plunger 104.
and a detection claw 108 rotated by a pin 106.
and a switch 110 in which the detection claw 108 contacts and changes the switching mode when the detection claw 108 rotates by a predetermined rotation angle.

The solenoid 102 is fixedly provided with an axis parallel to the cassette insertion direction F4, and the plunger 104 projects from the solenoid 102 toward the upper side, that is, the front, in the insertion direction F4. pin 1
06 is projected downward from the plunger 104. The detection claw 108 is connected to the pin 1 parallel to the pin 106.
12, and is rotatably supported by a spring 1.
14, it is urged to rotate in the direction of arrow F6, that is, in the direction away from the cassette accommodating portion 90.
The pin 106 is in contact with a detection claw 108, and when the solenoid 102 is energized and the plunger 104 is retracted into the solenoid 102, the detection claw 108 is rotated in the direction opposite to the arrow F6 to open the cassette housing section 90. make it stand out. The detection pawl 108 is arranged at a position where it can come into contact with the erroneous recording prevention pawl of a fully inserted cassette when it protrudes into the cassette storage section 90. The switching mode of the switch 110 is changed by the detection claw 108 when the detection claw 108 is rotated until it is fully protruded into the cassette storage section 90, with the erroneous recording prevention claw removed from the cassette. Ru. In addition, the solenoid 102
is energized when the cassette insertion operation is completed.

Next, the operation when inserting a cassette will be explained.
First, referring to FIG. 11, when the cassette 64 shown by the two-dot chain line is inserted into the cassette accommodating portion 90, it contacts the lever 62, and is further inserted slightly, the lever 62 moves the shaft 62a in the direction shown by the arrow F5. It is rotated around. As a result, switch 66 becomes conductive, motor 18 starts, and solenoid 46 is energized to move arm 48 in the direction of arrow F1. Additionally, an idler and reduction gear group 50
is connected to the motor 18, the timing belt 40 starts moving in the direction of arrow F2, and the holder 52 also moves in the direction of arrow F2.

When the holder 52 moves in the direction of arrow F2, the pin 54a contacts the cam surface 60a of the cam plate 60, so the lever 54 rotates in the direction of arrow F3 as shown in FIG. It stands out at 90. As a result, the lever 54 engages the transverse cross-sections of the head insertion opening of the inserted cassette 64 (of which six are formed in the cassette), and the cassette 64 is moved in the direction of arrow F2. I am drawn into it. Therefore, the cassette 64 is automatically retracted from now on.

When the holder 52 moves further in the direction of arrow F2 and the cassette 64 is pulled into the predetermined position shown in FIG. 13, the lever 54 disengages from the cassette 64. The holder 52 further moves in the direction of arrow F2, and the tip end 52a of the holder 52 touches the roller 76.
come into contact with. This roller 76 is attached to a restraining spring plate 74, and a pressing surface 52b is formed on the tip end 52a of the holder 52, as shown in FIG. . Therefore, as the holder 52 moves further in the direction of the arrow F2, the roller 76 is pushed down, as shown by the two-dot chain line in FIG. Push down the cassette 64 against the force of the spring 72. The cassette 64 is thereby inserted and assumes the dropped set position, completing the insertion operation of the cassette 64.

Even after the cassette 64 is set at the set position as described above, the holder 54 moves further in the F2 direction, thereby pressing the lever 78. This pressing operation of the lever 78 makes the switch 82 (see FIG. 1) conductive, and the solenoid 46
is deenergized and the driving of the timing belt 40 is stopped. Further, by the pressing operation of the lever 78, the head stand 30 moves forward toward the cassette 64, and the head comes into pressure contact with the tape, taking the fast forward rewind position. By fast forwarding or rewinding the tape in this state, a desired position on the tape can be detected.

When the switch 82 becomes conductive as described above,
Solenoid 102 in the erroneous recording prevention mechanism 100
is energized for a predetermined time, for example, one second. As a result, the plunger 104 is retracted into the solenoid 102, and the detection pawl 108 rotates in the direction opposite to the arrow F6, as shown in FIG. Therefore, when the cassette 64 housed in the cassette accommodating section 90 does not have the erroneous recording prevention claw 64a, the detection claw 108 enters into the window 64b of the cassette 64, and the switch 1 is turned off.
10 is conductive. As a result, recording by the cassette 64 is prohibited. Also, the erroneous recording prevention claw 64a
When the detection claw 108 does not rotate sufficiently, the switch 110 remains closed and recording by the cassette 64 is permitted.

When recording or playing, pressing an operation button (not shown) energizes the solenoid 32 and moves the head stand 30 further toward the cassette 64, which brings the head into further pressure contact with the tape and starts the recording or playing operation. will be started.

When ejecting the cassette 64, the solenoid 32 is deenergized by pressing an eject button (not shown), the motor 18 rotates in the opposite direction, and the holder 52 moves in the direction opposite to the arrow F2 direction. do. Therefore, the cassette 64 is ejected through the reverse process of insertion.

As described above, according to the present invention, the detection claw operates for a certain period of time only when the cassette is set at a predetermined setting position, so the detection claw does not get caught on the cassette, and the cassette Since it has nothing to do with the movement of the table, the timing will not shift.

[Brief explanation of the drawing]

Fig. 1 is a simplified plan view of an embodiment of the present invention, Fig. 2 is a side view seen from the arrow A side in Fig. 1,
Fig. 3 is a bottom view, Fig. 4 is a side view seen from the arrow B side in Fig. 1, Fig. 5 is a front view seen from the arrow C side in Fig. 1, and Fig. 6 is the same as Fig. 1. 7 is a simplified plan view showing only the main parts of FIG. 1, FIG. 8 is a plan view showing the erroneous recording prevention mechanism 100, and FIG. The front view of the figure, Figure 10 is the 8th
Left side view of Figures 11, 12 and 13
The figure is a plan view for explaining the operating state of the holder 52, and FIG. 14 shows the holder 5 in the state shown in FIG.
2 and roller 76, first
FIG. 5 is a plan view corresponding to FIG. 8 showing a state in which the detection claw 108 is in operation. 64...cassette, 64a...misrecording prevention claw,
82...Switch, 100...Mirror recording prevention mechanism,
102...Solenoid, 104...Plunger,
106...Pin, 108...Detection claw, 110...
Switch, 114...spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A switch whose switching mode changes when a cassette tape is set at a predetermined position where recording is possible, and a switch that operates for a predetermined period of time in accordance with the change in the switching mode of the switch. a driving means disposed at a position corresponding to the erroneous recording prevention pawl of the cassette in the set position, the driving means operates to abut the erroneous recording prevention pawl, and in a direction opposite to the direction of movement of the cassette; Another switch whose switching mode changes according to the energized detection claw and the detection claw fully operating without coming into contact with the erroneous recording prevention claw when the cassette's erroneous recording prevention claw is removed. A cassette tape recorder comprising: