JPS6158904B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette-type tape recorder in which a board equipped with a cassette loading section is mounted so as to be movable in and out of a frame.

For example, in a cassette tape recorder for a car stereo, a cassette loading section is provided on a movable board, and a tape cassette loaded in the cassette loading section is slid into the movable board into a fixed frame to perform playback operation. There is something that allows you to do this. Devices using this method are usually configured so that when the movable board is pushed to the final position, the magnetic head comes into contact with the tape and the pinch roller presses the tape against the capstan shaft, starting the playback operation. ing.

Components that employ this sliding method structurally require a larger amount of mechanical movement of movable parts than those that employ other methods. Therefore, unless the amount of movement of each part is measured and adjustments are made accurately during assembly, the contact pressure of the magnetic head against the tape or the pressing force of the pinch roller may become insufficient or excessive, resulting in poor performance. I can't make it work.

However, in conventional tape recorders of this type, the amount of movement of multiple moving parts is set independently based on the positional relationship between the movable board and the fixed frame, making measurement during assembly difficult. This not only made the adjustment more complicated, but also caused the problem of requiring a long time to assemble.

The present invention was made in view of these circumstances, and its purpose is to provide a slide that not only facilitates assembly, but also allows easy measurement and adjustment of the amount of movement of each part after assembly. An object of the present invention is to provide a cassette-type tape recorder that adopts this method.

Hereinafter, the configuration of the present invention will be explained based on illustrated embodiments.

FIG. 1 shows the schematic structure of a cassette tape recorder, in which 1 is a fixed frame and 2 is a movable board. The movable board 2 is placed on the fixed frame 1, and the movable board 2 is placed between the left side plates 1a and 2a and the right side plate 1b,
A slide plate 3 as a connecting member is inserted between each of the parts 2b. As shown in FIGS. 2 and 3, each side plate (only the left side plate 1a is shown) of the fixed frame 1 is provided with a pair of guide grooves 4, and the slide plate 3 has guide pins that fit into each of the guide grooves 4. 5
, so that it can freely slide in the front and rear directions with respect to the fixed frame 1. In addition, a pair of guide grooves 6 are provided on the slide plate 3, and the movable base plate 2 is provided with a pair of guide grooves 6 on the left and right side plates 2.
A and 2b have guide pins 7 that fit into the guide grooves 6, respectively, so that the slide plate 3 can freely slide in the front and rear directions. Therefore, the maximum sliding amount of the movable substrate 2 with respect to the fixed frame 1 is the sum of the maximum sliding amount of the sliding plate 3 with respect to the fixed frame 1 and the maximum sliding amount of the movable substrate 2 with respect to the sliding plate 3. In contrast, it can be slid from the position shown in FIG. 4 to the position shown in FIG.

A cassette loading section 9 into which a tape cassette 8 is loaded is provided on the upper surface of the movable substrate 2 on the outside of the fixed frame 1, and this loading section 9 has a pair of left and right reel shafts 10a, 10b and a capstan shaft 11. is installed. On the other hand, on the lower surface side of the movable substrate 2, a flywheel 12 is attached to the capstan shaft 11. Further, a motor mounting plate 13 is rotatably attached to the lower surface of the movable board 2.
A motor 14 is attached to the upper surface of the rotating end portion of 3. Further, a cam pin 15 is protruded from the lower surface of the rotating end of the mounting plate 13, and a cam groove 16 into which the cam pin 15 is fitted is formed in the fixed frame 1. This cam groove 16 is inclined at approximately 60 degrees with respect to the sliding direction of the movable base plate 2, and when the movable base plate 2 is at the position where it has slid furthest inward relative to the fixed frame 1 as shown in FIG. At the right end position of the cam groove 16, the motor 14 is located near the cassette loading section 9, but as the movable board 2 slides outward, the cam pin 15 moves inside the cam groove 16 to the left. Move the motor mounting plate 1
3 is rotated toward the center of the fixed frame 1, and the motor 14 is separated from the cassette loading section 9. When the movable board 2 is at the most outwardly slid position as shown in FIG.
Although the motor 14 is exposed to the outside, the motor 14 remains within the fixed frame 1. The motor 14 is connected to a power source when the movable substrate 2 slides to the position shown in FIG. 4.

The rotating shaft of the motor 14 protrudes from the lower surface side of the mounting plate 13, and a motor pulley 17 is attached to the protruding end of the rotating shaft, and the pulley 17 and the flywheel 1
2 are interlocked via an endless belt 18. Further, the flywheel 12 and the take-up reel shaft 10a are configured to interlock with each other via a transmission mechanism (not shown).

A magnetic head 1 is further mounted on the upper surface of the movable substrate 2.
A slide plate 20 to which 9 is attached is mounted so as to be slidable in the front and rear directions, and a pinch arm 22 which pivotally supports a pinch roller 21 is mounted so as to be rotatable (see FIGS. 6 and 7). The slide plate 20 has a guide hole 23 into which a guide pin 24 protruding from the movable substrate 2 is inserted. It is inserted into a guide hole 26 provided in the frame 1, and is slidable in the front and rear directions, and is normally biased inward of the fixed frame 1 by a tension spring 27 suspended between the movable base plate 2 and the movable base plate 2. . Further, an abutment plate 28 is attached to the upper surface of the slide plate 20 so as to be slidable in the front and rear directions. This contact plate 28 has two guide holes 2.
9 and 30, one of which is aligned with the guide hole 23 of the slide plate 20 to insert the guide pin 24, and a guide pin protruding from the upper surface of the slide plate 20 is provided in the other guide hole 30. 31
can be inserted and slid forward and backward. A tension spring 32 stronger than the spring 27 is hung between the slide plate 20 and the abutment plate 28, and due to the action of this spring 32, the abutment plate 28 is attached to the fixed frame 1 with respect to the slide plate 20. It is constantly biased inward.

Further, a bar spring 34 that rotates together with the pinch arm 22 is mounted on the mounting shaft 33 of the pinch roller 22 . The tip of the bar spring 34 is located between the locking pieces 20a and 28a bent on each side of the slide plate 20 and the contact plate 28.

A lock lever 35 is rotatably attached to the guide pin 24. This lock lever 35
has a hook portion 35a at one end, and a lock pin 36 is provided on the fixed frame 1 at a portion corresponding to the hook portion 35a. In addition, the movable substrate 2
A lock lever 35 and a lock pin 36 are provided on the top surface of the
The magnet 38 which together constitutes the locking means 37
is installed. The lock lever 35 is biased counterclockwise by a spring 39, and its other end is always in contact with the magnet 38. When the movable base plate 2 is slid inward of the fixed frame 1 to the position shown in FIG. 4, the magnet 38 becomes energized and attracts and holds the lock lever 35, and is released by the stop operation. Although electricity is supplied, the specific configuration will not be described in detail. In addition, when the movable board 2 is in the position shown in Fig. 4, the lock lever 3
Since the hook portion 35a of 5 is hooked on the lock pin 36, the movable substrate 2 cannot be slid outward from the fixed frame 1 while the magnet 38 is energized. Once broken, the movable board 2 can be slid outward from the fixed frame 1 while removing the hook portion 35a from the lock pin 36 with a slight force. Furthermore, when the movable base plate 2 is in the position shown in FIG. If the tape cassette 8 is loaded in the loading part 9 at this time, the magnetic head 19 comes into contact with the magnetic tape in the cassette 8. Furthermore, the locking piece 28a of the abutment plate 28 presses the bar spring 34 to rotate the pinch arm 22 clockwise, thereby bringing the pinch roller 21 into pressure contact with the capstan shaft 11 via the magnetic tape.

At the upper edges of the left and right side plates 1a and 1b of the fixed frame 1, tongue pieces 40 are respectively bent toward the center of the frame 1. One end of a cassette pressing spring (plate spring) 41 is fixed to each tongue piece 40. The other end of each spring 41 is the fixed frame 1
It faces inward and is slightly inclined downward.

Therefore, when loading the tape cassette 8 into this tape recorder and playing back the recorded contents, first slide the movable board 2 outward from the fixed frame 1 as shown in FIG. Load tape cassette 8. At this time, the slide plate 20 is pulled inwardly by the tension spring 27 together with the abutment plate 28, and the magnetic head 19 is at a position removed from the cassette loading section 9. Also, the locking piece 20 of the slide plate 20
By pressing the rod spring 34 inward of the fixed frame 1, the pinch roller 21 is also held at a position out of the cassette loading section 9. Further, the motor 14 remains within the fixed frame 1, and the cassette presser spring 41 is in a position removed from the cassette loading section 9.

Next, when the movable board 2 is slid inward of the fixed frame 1, the cam pin 15 provided on the motor mounting plate 13 slides in the cam groove 16, the motor mounting plate 13 rotates, and the motor 14 is rotated. approaches the cassette loading section 9, and the tape cassette 8 in the cassette loading section 9 is pressed down from above by the cassette pressing springs 41, 41. When the movable base plate 2 reaches the position shown in FIG.
6 and the magnet 38 is energized, and the movable substrate 2 is securely held in the position shown in FIG. Also, at this time, the magnetic head 19 comes into contact with the tape in the cassette 8, the pinch roller 21 comes into pressure contact with the capstan shaft 11 via the tape, and the motor 14 is connected to a power source to move the capstan shaft 11
and rotates the reel shaft 10a on the winding side. Then, the magnetic tape runs due to the rotation of the capstan shaft 11, and a reproduction operation is performed.

Next, to switch from playback to fast forward or rewind,
This is done by pushing the slide plate 20 inward into the fixed frame 1. That is, when the slide plate 20 is pushed inward into the fixed frame 1, the magnetic head 19 is separated from the tape in the cassette 8 as the slide plate 20 moves in the same direction, and the slide plate 20 is further locked. As the piece 20a presses the bar spring 34, the pinch roller 21 is separated from the capstan shaft 11. As a result, the magnetic tape is wound onto the take-up reel shaft 10a at high speed or rewound onto the take-up reel shaft 10b at high speed.

Further, when the stop operation is performed, the power to the motor 14 and the magnet 38 is stopped, and the reel shaft 10a,
10b and the capstan shaft 11 stop, the locking means 37 loses its locking function with respect to the movable base plate 2. Then, the movable board 2 is slid outward from the fixed frame 1 as shown in FIG. 5, and the cassette 8 can be taken out from the cassette loading section 9.

As explained above based on the illustrated embodiment,
In the cassette type tape recorder of the present invention, all of the elements necessary for performing a reproduction operation are mounted on a movable substrate 2. In addition, the magnetic head 19
The contact pressure of the pinch roller 21 and the pressing force of the pinch roller 21 are set in common by an abutting plate 28 serving as a driving member disposed on the upper surface of the movable substrate 2. Therefore, it is possible to measure the amount of movement of the magnetic head 19 and the contact pressure of the pitch roller 21 using a simulated fixed frame without using a regular fixed frame, which not only simplifies measurement but also makes fine adjustments. Work can also be made easier. Therefore, it can contribute to shortening the assembly time and can also contribute to lowering the price of the product.

Note that the present invention is not necessarily limited to the configuration of the embodiments, and can be modified in various ways. For example, the cassette pressing spring 41 may be attached to a connecting member (slide plate 3) that connects the fixed frame 1 and the movable board 2. The present invention can also be applied to an auto-reverse type cassette tape recorder equipped with one pair each of a capstan shaft and a pair of pinch rollers.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an external perspective view, FIGS. 2 and 3 are exploded perspective views showing the attachment relationship between the fixed frame, the movable board, and the slide plate, and FIG. 4 5 is a plan view, FIG. 6 is an exploded perspective view showing how the magnetic head and pinch roller are attached, and FIG. 7 is an external perspective view showing the same state. 1... Fixed frame, 2... Movable board, 3...
Slide plate, 8...Tape cassette, 9...Cassette loading section, 10a, 10b...Reel shaft, 11
... Capstan shaft, 19 ... Magnetic head, 21
... Pinch roller, 35 ... Lock lever, 36
...Lock pin, 37...Latching means, 38...Magnet, 41...Press the cassette.

Claims (1)

[Claims] 1. A fixed frame having an opening on the front side and a back wall, a movable substrate attached to the fixed frame so as to be able to move forward and backward from the opening side, and the above movable substrate at a position where the movable substrate is advanced a predetermined distance. a locking mechanism for selectively locking the movable base plate with respect to the fixed base plate; and a locking mechanism that protrudes a capstan shaft and a reel shaft onto the upper surface of the movable base plate, and positions the capstan shaft closer to the rear wall than the reel shaft. a tape cassette loading section, a tape running drive mechanism including a drive motor mounted on the movable substrate, and a magnetic tape disposed on the upper surface of the movable substrate at a position facing the tape cassette loaded in the cassette loading section. a head and a pinch roller, and a holder provided between the pinch roller, the magnetic head, and the movable substrate to constantly hold the magnetic head and the pinch roller in a position retracted from the tape cassette loading section by a spring force. a means disposed on the upper surface of the movable substrate so as to be able to move forward and backward in the same direction as the advance and retreat direction of the movable substrate, and is normally urged toward the rear wall side by a spring force, and the movable substrate is connected to the locking mechanism. As a result, from the position where the movable substrate has moved forward until just before it is locked, it comes into contact with the rear wall and starts moving in the backward direction of the movable substrate, and this moving force moves the magnetic head and the pinch roller toward the tape cassette loading section. A cassette type tape recorder comprising: a driving member that is moved to bring the magnetic head into contact with the tape and press the pinch roller against the capstan shaft via the tape.