JPH0426990Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" In this invention, when a tape cassette is inserted into the cassette holder, the holder automatically moves from the reset position to the set position to perform the playback operation.
Rotatably supports the base end of the pinch arm equipped with a pinch roller in a cassette-type tape recorder in which when the cassette holder is moved from the set position to the reset position, it automatically stops and the tape cassette is pushed back in the ejecting direction. Regarding the spindle part.

``Prior Art'' The overall mechanical structure of this type of cassette tape recorder will be explained below with reference to FIGS. 3 to 8.

That is, FIG. 3 is a plan view showing the mechanical part of the cassette tape recorder, FIG. 4 is a left side view of the same, and FIG. 5 is a right side view of the same.
2 is a cassette holder, 3 is a head support member, 4
5 is a locking member, 5 is an interlocking member, and 6 is an operating member.

A reel shaft 7, a capstan shaft 8, and a motor 9 for rotationally driving these are mounted on the upper surface side of the fixed substrate 1.

The cassette holder 2 has a flat plate shape and is arranged on the upper surface side of the fixed substrate 1, with one end pivoted to the proximal edge of the fixed substrate 1 as shown in FIGS. 6a and 6b.
The set position (lowering position) and the fixed board 1 in close contact with
It is rotatable between the reset position (raised position) and the remote position. The left and right ends and the front end of this cassette holder 2 are raised upward to form left and right side walls 10, 11 and a blocking wall 12, respectively, and the tape cassette 13 is placed on the left and right side walls from the hand side with the tape surface facing right. It is designed so that it can be inserted horizontally between 10 and 11. The cassette holder 2 also has an opening 14 in the center, and cutouts 15 and 16 extending from the bottom plate to the side wall 11 on the right side.
The tape cassette 1 in the cassette holder 2 is connected to the reel shaft 7 through the opening 14 and the carbstan shaft 8 through the front notch 15.
I am trying to have it inserted in 3. By rotating the cassette holder 2 from the set position to the reset position, the tape cassette 13 is removed from the reel shaft 7 and the carbstan shaft 8.

The head support member 3 has a flat plate shape, and is attached to the back side of the fixed base plate 1 so as to be slidable in the left and right directions, as shown in FIG. 7, and is always biased leftward by a tension spring 17. This head support member 3 has a magnetic head 18 mounted on its upper surface, and the magnetic head 18 is positioned on the upper surface side of the fixed substrate 1 to the right of the notch 16 on the hand side of the cassette holder 2.

Further, a magnetic head 18 is mounted on the upper surface of the fixed substrate 1.
A pinch arm 19 is rotatably supported via a support shaft 20 at a forward position. This pinch arm 19 has a pinch roller 21 attached to its rotating end, and the pinch roller 21 is positioned to the right of the notch 15 at the front, and is rotated from the right side by a deployment spring 22 wound around a support shaft 20. The pinch roller 21 elastically contacts a part of the head support member 3 and moves the pinch roller 21 to the capstan shaft 8 following the leftward movement of the head support member 3.
Press it against the

The lower end of the locking member 4 is attached to the fixed base plate 1 at a position below the rotating end of the cassette holder 2, as shown in FIG. Further, as shown in Figure b, a short locking piece 23 and a tall cassette push-out piece 24 are arranged side by side on the left and right, and a spring hanging piece 25 extending leftward is provided at the upper end of the push-out piece 24. . When this locking member 4 rotates in the cassette removal direction, the locking piece 23 moves to the lower surface side of the cassette holder 2 to prohibit rotation of the cassette holder 2 in the setting direction, and the push-out piece 24 The tape cassette 13 inside the cassette holder 2 is pushed back in the ejecting direction. Conversely, when the push-out piece 24 is pushed by the tape cassette 13 inserted into the holder 2, the locking piece 23 comes off from the lower surface of the cassette holder 2. Note that there is a push-out piece 2 at the rotating end of the cassette holder 2.
A recess 2b is formed opposite to 4 (see FIG. 3).

The interlocking member 5 is rotatably mounted on the left side wall 10 of the cassette holder 2 as shown in FIG. It is designed to rotate. Further, this interlocking member 5 is provided with a bifurcated leg portion 26 extending downward from the center of rotation, and the pressing protrusion 6a of the operating member 6 is appropriately engaged between the front and rear leg portions 26a and 26b. It's becoming like that.

Ends 27a and 27b of a deployment spring 27 as a rotational drive source shown in FIGS. 6a and 6b are locked to the spring hook 25 of the locking member 4 and one end of the interlocking member 5, respectively.

As shown in FIG. 7, the operating member 6 is attached to the back side of the fixed base plate 1 so as to be slidable in the front and rear directions.

This operating member 6 has its left side edge raised upward to form a pressing operating member 28, and the pressing protrusion 6a is positioned in front of the operating portion 28. Further, an inclined edge 29 is provided on the right side edge of the operating member 6 and is inclined leftward toward the front.
A roller 30 attached to the left end of the head support member 3 is pressed against it by a spring 17. Therefore, the operating member 6 is always pushed by the inclined edge 29 from the right side and urged toward the user's hand. When the operating member 6 is on the hand side, the roller 3
0 hits the front end of the inclined edge 29, the head support member 3 is moved to the leftmost side, and the magnetic head 18 is inserted into the cassette holder 2 through the notch 16. In this state, pinch roller 2
1 is also inserted into the cassette holder 2 through the notch 15, and the capstan shaft 8 is fixed by the spring 22.
is being pressed against. Further, when the pressing operation part 28 of the operating member 6 is pushed forward, the pressing protrusion 6a moves between the front and rear legs 26a of the bifurcated leg part 26 of the interlocking member 5,
26b and pushes the front leg portion 26a to rotate the interlocking member 5. As the operating member 6 moves forward, the inclined edge 29 pushes the roller 30, moves the head support member 3 rightward, and removes the magnetic head 18 from the notch 16. In this state, the pinch roller 21 is also pushed by the head support member 3 and comes to separate from the notch 15. Also, when the operating member 6 is pushed forward,
The interlocking member 5 rotates so that the front and rear legs 26a and 26b of the bifurcated leg 26 sandwich the pressing protrusion 6a from the front and back, so that when the cassette holder 2 is locked at the reset position, it cannot be operated. The member 6 is prohibited from returning to the hand side by the rear leg portion 26b. Therefore, when the cassette holder 2 is in the reset position, the operating member 6 may be accidentally pulled toward the user's hand, and the magnetic head 18 may be pushed back against the cassette 13.
There will be no problem of the device being moved to the insertion path. Furthermore, a normally closed power switch (not shown) is arranged in front of the operating member 6.
When pushing forward, the switch is released to stop the motor 9 and switch the tape recorder from playback mode to stop mode.

In the mechanism structure described above, the structure of the pivot portion at the proximal end of the pinch arm 19 is shown in detail in the exploded view of FIG. In the figure, reference numeral 50 denotes a sawn pivot that is attached to a hole made in the fixed base plate 1 and swaged, and the pinch arm 19 is attached to the expansion spring 2.
2 and assemble through the shaft holes 19', 19', and insert the E-ring 51 into the circumferential groove 50' at the top of the pivot 50.
It becomes locked by pinching it.

Note that one end 22' of the expansion spring 22 is connected to an engagement groove 5 provided in an upright piece 52 from the fixed base plate 1.
2'.

In the figure, reference numeral 53 denotes a standing wall for mounting the microswitch that stands up from the fixed board 1.

``Problems that the invention attempts to solve'' However, the above structure has the following problems.

i Since the pivot 50 is constructed by caulking the sawn material, the workability is extremely poor and the cost is high.

There are many crimping holes in the vicinity of the fixed base plate 1, and it is easy for the crimping work to be lost or forgotten.

There are a large number of parts, so careful consideration must be given to their management.

``Means for solving problems'' and ``effects'' This proposal was made in view of the above circumstances, and its gist is that the top of the vertical wall for mounting the micro switch near the pinch arm pivot part of the fixed board. A more fan-shaped tongue loose fitting hole was drilled to extend the arm, and a similar hole was also drilled in the fixed board directly below the tongue loose fitting hole, while the proximal end of the pinch arm was extended both above and below. In addition to forming a protruding upright plate shaft, the top end of the shaft is shaped to be narrow in the center, a deployment spring is attached to the shaft, and the upright plate shaft is fitted into the tongue loose fitting hole. However, there is no need to tighten the sawn material at all, completely eliminating the problems mentioned above.

"Example" This will be explained in detail below based on the drawings.

FIG. 1 is a developed view of the support shaft of the present invention.

In the figure, reference numeral 60 denotes an arm extending from a predetermined part of the upper end of the switch mounting vertical wall 53 and brought out horizontally toward the inside of the fixed board 1. The arm 60 has a fan-shaped tongue loose fitting hole 61 drilled therein. There is.

Further, a tongue piece loose fitting hole 62 having the same orientation is bored in the fixed substrate 1 directly below the loose fitting hole 61. The above-mentioned processing is performed simultaneously with other constituent parts when punching and bending the fixed substrate 1, and no separate additional process is required.

The tongue loose fitting holes 61 and 62 serve as shaft holes for an upright plate shaft portion, which will be described later, and are fan-shaped so that the plate-shaped shaft portion can swing within a required predetermined swing angle range. It is something.

As is clear from Fig. 2, the pinch arm 19 is composed of a bent plate having a U-shaped cross section, and holds the pinch roller 21 at its tip. At the same time, the base end is not bent, that is, it is in the shape of an upright plate that projects both upward and downward, and this is used as the shaft section 63.

The top end of the shaft portion 63 is shaped into a central step 63', and is adapted to be locked when fitted into the tongue loose fitting hole 61.

After the deployment spring 22 is fitted into the downward protrusion of the shaft 63, the shaft 63 is inserted into the hole 62 of the downward protrusion, and then the shaft 63 is inserted into the hole 61 of the upward protrusion. Attach the pinch arm 19 to complete the setup. At this time, there is no fear of disengagement due to the elastic pushing up action of the coil portion of the deployment spring 22.

According to the above configuration, the turning shaft 50 and the E-ring 51 are not required, and naturally, the process of tightening the shaft 50 is also not necessary.

``Effect of the invention'' As described above, according to the present invention, the need for costly turning parts and the like and the need for caulking have been achieved.

This reduces costs, improves work efficiency,
This reduces parts management and is extremely suitable for manufacturing.

[Brief explanation of the drawing]

Figure 1 is a developed view of the pinch arm support shaft of the present invention.
Fig. 2 is an exploded view of a conventional pinch arm support shaft, Fig. 3 is a plan view showing the mechanical part of a cassette tape recorder, Fig. 4 is a left side view of the same, Fig. 5 is a right side view of the same, 6a and 6b are side sectional views showing the relationship between the fixed board and the cassette holder, FIG. 7 is a plan view showing the relationship between the fixed board, the operating member, and the head support member, and FIG. 8a is a side sectional view showing the relationship between the fixed board and the cassette holder. FIG. 3B is a side sectional view showing the relationship with the stop member, and FIG. 60... Arm, 61... Hole of upward protrusion, 6
2... Hole of downward protrusion, 63... Shaft, 63'...
...Central narrow.

Claims (1)

[Scope of utility model registration request] Drill a fan-shaped tongue loose fitting hole from the upper end of the standing wall for mounting the micro switch near the pinch arm pivot part of the fixed board, and extend the arm. Drill a hole,
On the other hand, the base end of the pinch arm is made into an upright plate shaft that protrudes both upward and downward, the top end of the shaft is shaped to be narrow in the center, a deployment spring is attached to the shaft, and the upright plate shaft is A structure of a pinch arm support shaft in a cassette type tape recorder, characterized in that it is fitted into a tongue loose fitting hole.