JPS629580Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a protection mechanism for a tape recorder using a tuner unit, and particularly to a mechanism for preventing deformation of the pinch roller when the tuner unit is used.

In recent years, tape recorders have become popular, as they are small and lightweight, making them suitable for portability, and two-way stereo type devices are especially popular, especially for playback using headphones. It is made possible to do so. Incidentally, such headphone-only tape recorders are capable of not only simply playing back tapes, but also receiving radio broadcasts. In other words, this is the reception of radio waves,
A tuner unit (hereinafter referred to as a tuner pack), in which a tuner circuit section for performing tuning, detection, amplification, etc. is housed in a casing having approximately the same shape as a tape cassette, is used, and the tuner pack can be used in place of a tape cassette in a tape recorder. This is done by attaching it to the tape cassette storage section. Specifically, the tuner pack is provided with an output terminal at a position corresponding to the playback head of the tape recorder when it is installed in the tape cassette storage section, and is used to operate the playback controls of the tape recorder. Then, the playback head moves forward and comes into contact with the output terminal of the tuner pack. When a desired broadcasting station is selected by operating the tuning dial provided on the tuner pack, the received radio waves are detected and amplified, and then sent to the main amplifier circuit in the tape recorder via the output terminal and playback head. It was introduced and played on headphones,
This is where radio broadcasts are received.

In addition, this type of tape recorder is usually equipped with a tape/radio selection switch, and if the tuner pack is installed and the switch is set to the radio side, the tape running motor will not operate even if the playback control is operated. It is designed so that it does not rotate, which helps save battery power.

Incidentally, the playback head of the tape recorder is a so-called magneto-electrical converter that converts the magnetic signal of a normal magnetic tape into an electrical signal. Therefore, in order to introduce the output signal from the tuner pack into the tape recorder via the playback head, the output signal from the tuner pack is converted into a magnetic signal within the tuner pack and output from the output terminal. The signal must be converted back into an electrical signal by the playback head and supplied to the main amplifier circuit within the tape recorder.

Therefore, since the electric signal detected and amplified by the tuner pack is first converted into a magnetic signal and then converted back to an electric signal by the playback head, there is a lot of loss, which leads to deterioration in sound quality and undesirable situations such as unnecessary radiation. The problem is that it is easy to occur.

Therefore, in addition to solving the above-mentioned problems, for example, various tape recorder controls, the tuning dial, etc., have been organically installed in a small tape recorder cabinet and tuner pack, and playback methods have been developed when the tuner pack is in use. There is a strong demand for a product that takes various considerations in terms of manufacturing and tape recorder maintenance, such as preventing deformation due to the pinch roller being pressed against the non-rotating capstan when the operator is operated. ing.

This invention was made based on the above circumstances, and by identifying whether a tuner pack or a tape cassette is installed in the tape cassette storage section and preventing the pinch roller from coming into contact with the capstan when the tuner pack is installed, An object of the present invention is to provide an extremely good protection mechanism for a tape recorder using a tuner unit, which can prevent deformation of the pinch roller when a tuner pack is used.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings. FIG. 1 shows the external appearance of a tape recorder to which this invention is applied. That is, the cabinet 11 is approximately box-shaped and has a size that allows the user to easily carry it by putting it in a pocket or the like, and is made by combining a front cabinet 12 and a rear cabinet 13. On the left side of the cabinet 11 in the figure, rewind, fast forward, playback, and stop/eject operators 14 to 17 are provided. Further, a talk operator 18 is provided above the playback operator 16 in the figure. This talk operator 18 can be operated by pressing together with the playback operator 16, and when it is operated, the built-in microphone 19 provided at the upper end of the cabinet 11 in the figure is activated, regardless of whether a tape is being played back or the radio is operating. Through this, you can hear surrounding sounds.

Furthermore, when the rewind or fast forward operators 14 and 15 are operated while the playback operator 16 is operated and the tape is being played back, the tape recorder enters the review or queue state. Furthermore, rewind,
If the stop/eject operator 17 is operated while any of the fast forward and playback operators 14 to 16 has been operated in advance, the operator 14 to 16 that was operated earlier returns to its non-operating position. , when the stop/eject operator 17 is operated for the second time,
A so-called double eject mechanism is provided for ejecting a tape cassette (not shown).

Here, on the left side of the cabinet 11 in the figure, at the lower part of the part where the rewind, fast forward, play and stop/eject operators 14 to 17 are arranged, there are volume adjustment operators 20 and 21. It is provided. The volume adjustment controls 20 and 21 are for the right channel and left channel of a two-way stereo, respectively, and can be slid in the directions of arrows A and B in the figure, respectively, and the volume increases as the controls are operated in the direction of arrow B. be.

Further, on the upper surface of the cabinet 11 in the figure, there are a battery indicator 22, a tape type selection switch 23, a noise reduction selection switch 24, a radio indicator 25, a tape-radio selection switch 26, and a headphone jack 2.
7 are arranged respectively. First of all, the battery indicator 22 is a meter that indicates the degree of battery power consumption, and can be operated both when the tape is running and when the radio is operating. Further, the tape type changeover switch 23 is used to change over the type of tape used depending on whether it is a normal tape or a chrome tape. Furthermore, the noise reduction changeover switch 24 performs switching depending on whether or not the tape used has been subjected to noise reduction processing. The tape-radio selector switch 26 is used to switch depending on whether the tape is played back or the tuner pack is used for radio reception. This prevents the tape running motor from rotating, which helps conserve battery power. Therefore, by switching the tape-radio changeover switch 26 to the radio side while the tape is being played back, a so-called pause function can be performed to temporarily stop the tape running. In addition, the tape-radio selection switch 26
When you switch to the radio side, radio indicator 2
5 is now lit. Further, the headphone jack 27 has a headphone plug attached to the tip of a headphone cord extending from a headphone (not shown) inserted therein, and this headphone cord serves as an antenna during radio operation.

Here, in the front cabinet 12 of the cabinet 11, a tape cassette storage section 28 is formed. Inside this tape cassette storage section 28,
A pair of reel stands 29, 30, a pair of cassette guide pins, a playback head, a pinch roller, a capstan, etc., which are not visible in the figure, are arranged at predetermined positions, respectively. The tape cassette storage section 28 is closed by a cassette lid 31 made of, for example, a transparent acrylic plate.

In the case of a headphone-dedicated tape recorder such as the one described above, the user may suffer from hearing loss if the user listens for a long time at a high volume or high sound pressure. Therefore, as shown in FIG. 2, each volume adjustment operator 20, 21 has a red section 201, 211, for example, along the slide path in the direction in which the volume increases, that is, in the direction of arrow B in the figure. , yellow portions 202, 212, and green portions 203, 213, which are displayed in three different colors. and,
For example, when performing continuous listening for 90 minutes or more, adjust the volume adjustment controls 20, 21 to the red sections 201, 21.
11, that is, within a low volume range. In addition, when listening only for a time of 60 minutes to 90 minutes and 60 minutes or less, move the volume adjustment controls 20 and 21 to the yellow sections 202 and 211, respectively.
The user can easily select the volume according to the listening time by setting the sound volume below the range of the green parts 203 and 213, so that hearing loss is less likely to occur.

Furthermore, this color-coded display is a measure to prevent hearing loss.
Slide-type volume adjustment control 2 as shown above
The present invention can be widely applied not only to 0.0 and 21 but also to general audio equipment using headphones having a rotary volume adjustment operator 32 as shown in FIG. 3, for example. That is, in this case, a red portion 321 and a yellow portion 322 are formed along the outer periphery of the volume adjustment operator 32.
and a color-coded display section 324 such as a green section 323, etc.
What is necessary is to form it, for example, on the panel surface of the audio equipment.

Here, FIG. 4 shows the external appearance of a tuner pack used for receiving radio broadcasts with the tape recorder. That is, this tuner pack is exclusively for FM, and 33 is a casing having substantially the same shape and size as a normal tape cassette, and is formed by combining a top casing 34 and a bottom casing 35. The playback head and pinch roller are inserted into the casing 33 at a portion corresponding to the head insertion port and pinch roller insertion port of a normal tape cassette, when the tuner pack is installed in the tape cassette storage section 28 of a tape recorder. Recess for escape 3
6, 37 are formed. In addition, the recess 3
Insertion holes 38 and 39 for the cassette guide pin and capstan are formed at the upper and lower parts of the figures 6 and 37, respectively. Further, on the upper casing 34 of this casing 33, there is a reception frequency display board 40, a music selection dial 41, a monaural-stereo changeover switch 42, and an FM stereo-monaural display section 43.
are arranged respectively. This reception frequency display plate 40 is circular and has numbers indicating reception frequencies attached at appropriate frequency intervals along its outer periphery as shown in the figure. Then, the received frequency display board 40
is rotated clockwise and counterclockwise in the figure by rotating the tuning dial 41, and the receiving frequency display board 40 and the tuning dial 41
The number indicated by a substantially triangular indicator 44 attached between the two is read as the reception frequency at that time. Also, F.M.
The stereo-monaural display section 43 is, for example, an LED
It is constructed using (light-emitting diodes),
It lights up when receiving an FM stereo broadcast and turns off when receiving an FM monaural broadcast.

Although the tuner pack described above was designed exclusively for FM, it can be equipped with an AM-FM switch, for example, so that it can also receive AM.

Furthermore, as shown in FIG. 5a, the casing 33 is attached to the tape cassette storage section 28 on both sides of the reception frequency display plate 40, that is, on the portions corresponding to a pair of reel hubs in a normal tape cassette. A recess 4 (details of which will be described later) for escaping the reel stands 29 and 30 in the attached state.
5, 46 are formed. Also, casing 3
As shown in FIG. 5b, a plurality of (six in the illustrated case) electrode pins 47 are protruded from the bottom casing 35 at the right end in FIG. 5a of FIG.

As shown in FIG. 6, an electrode receiving portion 48 is formed in a portion of the tape cassette storage portion 28 that corresponds to the electrode pin 47 of the tuner pack. When the tuner pack is mounted in the tape cassette storage section 28, the electrode pins 47 come into contact with the electrode receiving section 48, thereby establishing an electrical connection between the tuner pack and the tape recorder. In FIG. 6, 49 is a reproduction head, 50 is a capstan, and 51 is a pinch roller.

Therefore, since the electrode pin 47 is provided on the bottom of the tuner pack, when the tuner pack is attached to the tape cassette storage section 28,
Due to the weight of the tuner pack and the action of a cassette holding spring (not shown), the electrode pin 47 is pressed against the electrode receiving portion 48, thereby making it possible to establish a reliable electrical connection. In addition, since the output electrical signal from the tuner pack can be directly introduced into the tape recorder via the electrode pin 47 and the electrode receiver 48, the output signal from the tuner pack can be converted into a magnetic signal for passing through the playback head as in the conventional case. There is no need for conversion, eliminating loss and improving sound quality.

Next, the detailed structure of the tuner pack will be explained. That is, as shown in FIG. 7, the bottom casing 35 is provided with recesses 36 and 37 for allowing the reproducing head 49 and pinch roller 51 to escape, as well as recesses 45 and 37 for allowing the reel stands 29 and 30 to escape. 46 is formed. This recess 4
5 and 46 are openings 451 and 461 formed in the bottom casing 35;
It consists of cylindrical parts 452, 462 that protrude substantially perpendicularly toward the top casing 34 from the bottom casing 35, and the tips of the cylindrical parts 452, 462 are formed when the bottom casing 35 and the top casing 34 are combined.
It is closed by the upper surface casing 34.

A printed wiring board 52 is housed inside the bottom casing 35. This printed wiring board 52 includes a tuner circuit section that performs reception, tuning, detection, amplification, etc. of radio waves. Also,
A tuning variable capacitor 53 is attached to a substantially central portion of the printed wiring board 52 with a screw 54 . And this variable capacitor 53
A bevel gear 55 is attached to the operating shaft that is not visible in the figure, and when the bevel gear 55 is rotated in the directions of arrows C and D in the figure, the operating shaft is rotated. , the capacitance is varied to perform tuning. Further, in the vicinity of the portion of the printed wiring board 52 to which the variable capacitor 53 is attached, a support stand 56, the details of which will be described later, is provided with screws 57,
57 and nuts 58, 58. This support stand 56 rotatably supports the channel selection dial 41.
1 is supported on the support stand 56, a gear 59 provided coaxially with the channel selection dial 41 meshes with the bevel gear 55. When the tuning dial 41 is rotated, the rotational force is transmitted to the operating shaft of the variable capacitor 53 via the gear 59 and the bevel gear 55, thereby performing tuning.

Further, on both sides of the portion where the variable capacitor 53 is attached to the printed wiring board 52,
Through holes 521 and 522 are formed through which the cylindrical portions 452 and 462 of the bottom casing 35 are inserted.
Further, the upper surface of the bevel gear 55 in the drawing is a flat surface, and the receiving frequency display plate 4 is formed on the flat surface.
0 is pasted. Further, the printed wiring board 52
An LED 431 and a monaural-stereo changeover switch 42 constituting the FM stereo-monaural display section 43 are attached to the FM stereo-monaural display section 43.

Here, the electrode pins 47 are supported by a holding plate 60 and housed in the bottom casing 35 along with the printed wiring board 52. Then, the electrode pin 47 is inserted through the through hole 351 formed in the bottom casing 35 and projected to the outside of the bottom casing 35.

Here, FIG. 8 shows a bottom casing 35, a printed wiring board 52, a channel selection dial 41, and an electrode pin 4.
7 and the holding plate 60 are shown in a state where they are housed. That is, the printed wiring board 52 has a plurality of support pieces 352 formed on the peripheral side wall of the bottom casing 35.
It is fitted and fixed. In addition, the holding plate 60
The support pieces 353 are also fitted into and fixed to a plurality of support pieces 353 formed on the bottom casing 35. Further, a lug terminal 61 is attached to each electrode pin 47, and the lug terminal 61 and a connection pattern (not shown) on the printed wiring board 52 are connected by a lead wire (not shown). In addition, the bottom casing 3
Screw holes 354 for fixing to the upper surface casing 34 are formed in the four corners of 5.

Then, as described above, when the printed wiring board 52, the channel selection dial 41, the electrode pins 47, the holding plate 60, etc. are housed in the bottom casing 35, the top casing 34 is combined and fixed with screws (not shown). do. The upper casing 34 is formed with through holes 38 and 39 through which the cassette guide pin and capstan 50 are inserted, as shown in FIG. 7 again. Windows 341 and 342 are formed for viewing, and the channel selection dial 41 and AM-FM changeover switch 4
2 is inserted through the hole 34 and can be operated from the outside.
3,344 are formed. Although the bottom casing 35 is also formed with through holes 38 and 39 through which the cassette guide pin and capstan 50 are inserted, they are not shown in FIG. 7 for simplicity.

Here, decorative papers 62 and 63 are attached to the top casing 34 and bottom casing 35. Among these, the decorative paper 62 has through holes 621 and 622 formed in portions corresponding to the reception frequency display board 40 and the LED 431, and the instruction portion 44 is drawn thereon. In addition, through holes 631 and 632 are formed in the decorative paper 63 at portions corresponding to the recesses 45 and 46 of the bottom casing 35.

Then, the tuner pack is completed as described above. Here, the recess 36 of the casing 33 for reproducing the reproducing head 49 may be formed of a magnetic shielding member, since the magnetism of the reproducing head 49 may have an adverse effect on the tuner circuit section of the printed wiring board 52. A magnetic shielding member may also be incorporated. Furthermore, the casing 33 includes a top casing 34 and a bottom casing 3.
When combined with casing 5, it is completely airtight, and dust and the like do not enter into the casing 33 from the outside.

Here, means for supporting the electrode pin 47 on the holding plate 60 will be explained. That is, as shown in FIG. 9, the electrode pin 47 is formed of a conductive material into a substantially cylindrical shape, and a groove 471 is formed along the outer periphery in the substantially central portion thereof. Further, a protrusion 472 is formed at the upper end of the electrode pin 47 in the figure. Then, the E-shaped ring 64 is fitted into the groove 471 of the electrode pin 47. Thereafter, the upper part of the electrode pin 47 in the figure is inserted into the through hole 601 formed in the coiled spring 65 and the holding plate 60. Then, connect the protrusion 472 of the electrode pin 47 to the lug terminal 61.
The electrode pin 47 is inserted into the through hole 612 formed in the base 611 of the holding plate 6 and caulked.
0.

As shown in FIG. 10, the electrode pins 47 attached to the holding plate 60 as described above can each independently slide in the directions of arrows E and E in the figure together with the lug terminals 61. 6
5 in the direction of arrow F in the figure. A portion of the electrode pin 47 that is lower in the figure than the E-shaped ring 64 is inserted through the through hole 351 of the bottom casing 35 and protrudes outward.

A through hole 614 is formed in the tip 613 of the lug terminal 61, and the tip 613 and the connection pattern of the printed wiring board 52 are connected by a lead wire (not shown).

Here, as shown in FIG. 11, the holding plate 60 has a notch 602 formed between each electrode pin 47 and extending inward from one side thereof.
A substantially cylindrical protrusion 355 is integrally formed on the bottom casing 35 and is positioned within the notch 602 with the holding plate 60 supported by the support piece 353 of the bottom casing 35. .
As shown in FIG. 12, this protrusion 355 is located between the tip portions 613 of each lug terminal 61, and the electrode pin 47 resists the biasing force of the spring 65 and moves upward as shown by the dashed line in the figure. Even if it is pushed up, the height is determined so that it is located between the tips 613 of the lug terminals 61 at that position.

Therefore, since the protrusion 355 is interposed between the tip portions 613 of each lug terminal 61, the lug terminal 61 rotates around its base portion 611 regardless of the height of the electrode pin 61, and the tip This can prevent the portion 613 from coming into contact with the tip portion 613 of another adjacent lug terminal 61. In addition, the protrusion 3
Reference numeral 55 also serves as a guide for moving the lug terminal 61 in the vertical direction in FIG.

Furthermore, since the E-shaped ring 64 is used,
Before inserting the spring 65, attach the electrode pin 47 and the lug terminal 61.
Since the assembly can be connected to the lead wires, the order of assembly is not restricted, and the assembly can be carried out from the necessary parts as desired, making manufacturing easy.

Here, FIG. 13 shows a conventionally considered electrode pin 661. That is, the electrode pin 661 is formed into a substantially cylindrical shape, and a flange portion 662 is formed approximately at the center thereof. The upper end of the electrode pin 661 in the figure is formed into a substantially conical shape, and a recess 663 is formed at the top.
Then, the upper part of the electrode pin 661 in the figure is connected to a coiled spring 664 and a through hole 666 of a holding plate 665.
insert it into the Thereafter, as shown in FIG. 14, the lower part of the electrode pin 661 in the figure is inserted into the through hole 351 of the bottom casing 35, and the holding plate 665 is fixed to the bottom casing 35.
I am trying to install it. And electrode pin 6
The recess 663 of 61 and the connection pattern of the printed wiring board 52 are connected by a lead wire 667. For this reason, the electrode pin 661 is
After inserting the lead wire 667 into the through hole 666 of No.
must be connected to the recess 663, which limits the assembly order and tends to make manufacturing difficult. In addition, the electrode pin 66
1 has a shape as shown in FIG. 15 and is cut to make the upper part in the figure conical, which also makes manufacturing difficult.

However, the electrode pin 47 as shown in FIG.
According to this mounting means, the assembly order is not restricted as described above, and the electrode pin 47 is placed in the groove 4.
71 is easier to manufacture than the conventional cutting into a conical shape.

Next, the structure of the electrode receiving section 48 of the tape cassette storage section 28 will be explained. That is, as shown in FIG. 16, the tape cassette storage section 28
is formed with a generally concave side surface, and the bottom plate 67 is provided with the reel stand 30, a cassette guide pin 68 (only one of which is shown), and the like. Of these, the reel stand 30 is connected to a tape recorder mechanism (not shown) installed at the bottom of the bottom plate 67 in the drawing. Further, on one side wall of the tape cassette storage section 28, the tape cassette storage section 28 is provided.
A leaf spring 69 is provided to hold the tape cassette and tuner pack in the attached state.

Approximately oval through holes 671 and 672 are formed at one end of the bottom plate 67, and a plurality of through holes 671 and 672 are connected to the respective electrode pins 47 of the tuner pack (in the case shown in the figure). The receiving electrode pins 70 (three each in the through holes 671 and 672) can be seen through the through holes 671 and 672.
The electrode receiving portion 48 is screwed with a screw 71. That is, as shown in FIGS. 17a and 17b, the electrode receiving portion 48 is formed by embedding the receiving electrode pin 70 in a support 481 made of a synthetic resin material and formed into a substantially elongated cylinder shape. Further, screw members 482 having a substantially cylindrical shape and having a thread groove formed on the inner wall surface are embedded in both ends of the support body 481.

Here, the receiving electrode pin 70 is formed of a conductive material into a substantially cylindrical shape, and a substantially conical protrusion 701 is formed at the center of the upper end in FIG. 17b. Further, a connecting electrode 702 is provided protruding from the substantially central portion of the lower end of the receiving electrode pin 70 in the figure. Also, among the upper surfaces of the support body 481 in the drawing,
At portions of the bottom plate 67 corresponding to the through holes 671, 672, stepped portions 483, 484 are formed that protrude by approximately the thickness of the bottom plate 67.

Then, as shown in FIG. 16 again, the stepped portions 483 and 484 of the support body 481 are fitted into the through holes 671 and 672 of the bottom plate 67. At this time, each screw member 4 embedded in the support body 481 is attached to the bottom plate 67.
Through holes 673 and 674 are formed at positions corresponding to 82. Then, the screw 71 is attached to the bottom plate 67.
The electrode receiving portion 4 is inserted through the through holes 673 and 674 and screwed onto the screw member 482, respectively.
8 is attached to the tape cassette storage section 28.

Here, approximately rod-shaped support portions 675 and 676 are implanted at predetermined positions on the lower surface of the bottom plate 67 in the drawing. Threaded holes 677, 678 are formed at the tips of the supports 675, 676. and,
A printed route board 72 on which various circuit parts in the tape recorder are configured is supported by the support parts 675 and 676. That is, this printed wiring board 7
2 has through holes 721, 722, and 723 formed in portions corresponding to the supporting portions 675, 676 and the connection electrode 702 of the receiving electrode pin 70, respectively. Then, each connection electrode 702 of the receiving electrode pin 70 is inserted into each through hole 723 of the printed wiring board 72, and the screw 73 is inserted through the through hole 721, 722 of the printed wiring board 72, and the supporting parts 675, 676
The printed wiring board 72 is fixed to the bottom plate 67 by being screwed into the screw holes 677 and 678. Thereafter, the connecting electrode 7 between the conductive pattern (not shown) of the printed wiring board 72 and the receiving electrode pin 70
02 is soldered.

FIG. 18 shows the tape cassette storage section 28 with the electrode receiving portion 48 and printed wiring board 72 etc. attached as described above, as viewed from above. One end of the printed wiring board 72 has attached thereto the battery indicator 22, tape type selector switch 23, noise reduction selector switch 24, radio indicator 25, tape-radio selector switch 26, headphone jack 27 etc.

Therefore, the receiving electrode pin 70 is attached to the support body 481.
This support body 481 is attached to the bottom plate 67 of the tape cassette storage section 28, and then the conductive pattern on the printed wiring board 72 and the receiving electrode pin 70 are connected, so that the positioning of the receiving electrode pin 70 is This can be done accurately without shifting with respect to the electrode pins 47 of the tuner pack. That is, each receiving electrode pin 70 is embedded in the support body 481 in a pre-positioned state. Therefore, each receiving electrode pin 70 is already positioned and fixed in a state in which the support body 481 is attached to the bottom plate 67. After that, each receiving electrode pin 70 is electrically connected to the printed wiring board 72, so that each receiving electrode pin 70 is accurately fixed at a predetermined position without being displaced. Further, since the receiving electrode pin 70 is directly connected to the printed wiring board 72, it can contribute to downsizing of the tape recorder.

Regarding this point, conventionally it has been considered to connect the receiving electrode pin and the printed wiring board via a separate lead wire. As a result, the space factor deteriorates, making it impossible to contribute to downsizing of the tape recorder, and causing various inconveniences such as increased assembly man-hours and breakage of lead wires.

However, since the receiving electrode pin 70 is directly connected to the printed wiring board 72, the space factor is improved, which contributes to downsizing of the tape recorder and also facilitates assembly.

In addition, the part of the receiving electrode pin 70 that comes into contact with the electrode pin 47 is made into a conical protrusion 701 so as to make approximately point contact with the electrode pin 47. This is to ensure reliable contact by preventing the build-up of dirt and poor contact.

Note that the position of the electrode pin 47 of the tuner pack is not limited to the position shown in FIG.
Of course, it may be provided in the positions shown in FIGS. 19a and 19b. In short, the electrode pin 47 may be provided anywhere as long as it is on the bottom surface of the tuner pack. In this case, the electrode pin 47
Bottom plate 6 of tape cassette storage section 28 corresponding to
Needless to say, the electrode receiving portion 48 is attached to the electrode receiving portion 7.

Next, the means for attaching the channel selection dial 41 will be explained. That is, as shown in FIG. 20, the channel selection dial 41 and the gear 59 are connected by a shaft 74 having a diameter smaller than that of the gear 59 at least. Further, the support stand 56 is formed of a synthetic resin material and has a substantially cubic shape, and the upper surface of the support stand 56 has the above-mentioned shaft 7.
A semicircular recess 561 having the same diameter as 4 is formed. Further, a space 562 for escape of the channel selection dial 41 is formed at one end of the support base 56. Further, the shaft 7 is provided approximately at the center of the support base 56.
A pair of support pieces 563 and 564 are formed to hold the recess 4 fitted in the recess 561.

First, attach the support base 56 to the screw 57 and nut 5.
8 and fixed to the printed wiring board 52. next,
The shaft 74 is fitted into the recess 561 of the support stand 56 and supported by support pieces 563 and 564. At this time, the channel selection dial 41 is positioned within the space 562 of the support base 56. The tuning dial 41 is rotatable in the directions of arrows G and H in the figure, and the shaft 7
4 has a smaller diameter than the gear 59, movement of the shaft 74 in the axial direction is prevented by the gear 59 and the tuning dial 41. At this time, the gear 59 is a bevel gear 55 attached to the operating shaft of the variable capacitor 53.
It meshes with. Then, by rotating the tuning dial 41 in the directions of arrows G and H in the figure, the bevel gear 5
5 is rotated in the directions of arrows C and D in the figure to change the capacity.

In addition, as shown in FIG. 21, the support stand 56
A locking piece 565 is formed at the lower part of the figure, and the locking piece 56
5 into the through hole 521 formed in the printed wiring board 52, the support base 56 is fixed to the printed wiring board 52.
It may be installed on the In this way, the screws 57 and nuts 58 are not required, making the assembly work easier.

Therefore, first, the diameter of the shaft 74 was made smaller than the diameter of the gear 59, and the diameter of the recess 561 of the support base 56 was made the same as the diameter of the shaft 74. The shaft 74 can be easily prevented from sliding in the axial direction, and a separate member or mechanism for preventing the shaft 74 from sliding in the axial direction is not required, and the configuration is simple. Also, using the shaft 74 of the channel selection dial 41, the bevel gear 55 is connected to the shaft 74.
Since the gear 59 that meshes with the gear 59 is attached, the structure is efficient and organic, and malfunctions are less likely to occur.

As shown in FIG. 22, the cassette lid 31 of the tape recorder can be opened and closed about its base 311 in the directions of arrows I and J in the figure. The cassette lid 31 has a tuner pack installed in the tape cassette storage section 28, and the tuner pack's tuning dial 41.
A through hole 312 is formed at a position corresponding to .
As shown in FIG. 23, the channel selection dial 41 is inserted into the through hole 312 so that the channel selection dial 41 can be operated even when the cassette lid 31 is closed. The cassette lid 31 is tapered outwardly so that it can be easily operated from the outside.

Therefore, the channel selection dial 4 is placed on the cassette lid 31.
Since the through hole 312 for insertion of the cassette 31 is formed, it is possible to select a channel without opening the cassette lid 31, making handling extremely convenient. Also, a through hole 312 for inserting the channel selection dial 41.
Alternatively, for example, a through hole for inserting the monaural-stereo changeover switch 42 may be formed in the cassette lid 31 so that the monaural-stereo changeover switch 42 can be operated with the cassette lid 31 closed. Furthermore, if the tuner pack uses a frequency synthesizer method, a through hole for inserting the frequency up and down controls should be inserted into the cassette lid 3.
1.

Next, the attachment of the volume adjustment operators 20 and 21 to the cabinet 11 will be explained. That is, as shown in FIG.
0 and 21 are main body portions 20 made of substantially rectangular plates.
4, 214, engaging portions 205, 215 protruding in a substantially L-shape from mutually different sides at the same end of the main body portions 204, 214;
Operation units 206 and 2 provided at the same end of 214
It consists of 16.

The volume adjustment operations 20 and 21 are arranged in such a way that the operation sections 206 and 216 are adjacent to each other, and the main bodies 204 and 214 are arranged side by side, and in this state, they are inserted into the cabinet 11 as shown in FIG. It will be installed. That is, the cabinet 11 has the front cabinet 12 and the rear cabinet 13 combined, and the volume adjustment operator 2.
A long hole 111 is formed in the sliding direction of 0 and 21. And this long hole 111
The operation section 206 of the volume adjustment operation elements 20 and 21,
216 and insert them. Thereafter, a support plate 75 is installed at the bottom of each volume adjustment operator 20, 21 in the figure. As shown in FIG. 26, this support plate 75 is a substantially rectangular plate with substantially L-shaped plates on both sides thereof corresponding to the engaging portions 205, 215 of the volume adjustment operators 20, 21. Support pieces 751, 752
It is formed by the formation of And again the 25th
As shown in the figure, both support pieces 751, 7 of the support plate 75
52 and the front and rear cabinets 12, 13, the main body part 204, the engaging part 205, and the main body part 2
14, so that the engaging portions 215 are sandwiched between them. Further, the support plate 75 has both support pieces 751, 7
52 is fitted into recesses 121, 131 formed in the front and rear cabinets 12, 13 and held in the cabinet 11, and the volume adjustment controls 20, 21 are attached to the cabinet 11 here.

Here, a plurality of (three in the illustrated case) protrusions 207, 217 are formed at predetermined positions on the main body portions 204, 214 of the volume adjustment operators 20, 21. These protrusions 207, 217 are arranged so that the main body parts 204, 214 and the engaging parts 205, 215 of the volume adjustment operators 20, 21 are sandwiched between the support plate 75 and the front and rear cabinets 12, 13. In addition to eliminating sagging, the main body parts 204, 21
4 and the engaging portions 205, 215 and the support plate 75 and the front and rear cabinets 12, 13 are reduced in contact area, so that the volume adjustment operators 20, 21 can be easily slid.

Therefore, the main body portion 204, the engaging portion 205, the main body portion 214, and the engaging portion 215 of the volume adjustment operators 20, 21 are connected to the front and rear cabinets 12,
13 and the support plate 75 supported by the recesses 121, 131 when the front and rear cabinets 12, 13 are combined, the two volume adjustment operators 20, 21 can be It can be slidably supported independently and independently, and is extremely easy to assemble.

Also, as shown in FIG. 24 again here, through holes 208 and 218 are formed in the other ends of the main bodies 204 and 214 of the volume adjustment operators 20 and 21, respectively. As shown in FIG. 27, one end of each of the wires 76 and 77 is inserted through the through holes 208 and 218, respectively. These wires 76, 77
The other end portions of the variable resistor bodies 78 and 79 are connected to sliders 781 and 791, respectively. Further, the variable resistor bodies 78, 79 are attached to a holding plate 80, and the holding plate 80 is attached to the printed wire plate 72 provided in the tape recorder.

Then, by sliding the volume adjustment operators 20 and 21 in the directions of arrows A and B in the figure,
Sliders 781, 791 via wires 76, 77
slides on the variable resistor bodies 78, 79 to change the resistance value, thereby allowing the volume of the left and right channels to be changed independently.

Here, FIG. 28 shows the slider 781 and the wire 76.
This shows the connection means with. In addition, the slider 7
The means for connecting the wire 77 to the wire 91 can be explained in the same manner, so a description thereof will be omitted. That is, a through hole 782 is formed in the slider 781. The end of the wire 76 is bent into a substantially U-shape so as to surround the slider 781, and the substantially central portion of the folded portion is bent into a substantially U-shape so as to be inserted into the through hole 782. ing. Further, the tip of the folded portion of the wire 76 is bent in a direction surrounding the slider 781.
Then, if this U-shaped folded part is expanded in the direction of the arrow in the figure, and the slider 781 is interposed between them, and the expansion in the direction of the arrow is stopped, the wire 7
6 returns to its original position due to elastic force, and the wire 76
and slider 781 are connected.

Also, from the length ₁ of the slider 781, the wire 7
By determining the folding length ₂ of 6, the wire 76 and the slider 781 can be connected without rattling.

Therefore, the volume adjustment operators 20, 21 and the sliders 781, 791 of the variable resistor bodies 78, 79
Since they are connected by wires 76 and 77, the structure is extremely simple and malfunctions are less likely to occur, and it occupies less space, making it suitable for downsizing the tape recorder. Here, in the case of a small tape recorder, due to the arrangement of parts inside the cabinet 11, the volume adjustment controls 20, 21 are
It is often necessary to separate the variable resistor main bodies 78 and 79 from each other. In such a case, conventionally, the operator and the resistor are connected using a threading method. For this reason, the configuration becomes complicated, which causes problems such as malfunctions becoming more likely to occur and the occupied volume increasing.

However, since the volume control controls 20, 21 and the sliders 781, 791 are connected linearly by the wires 76, 77, the connection can be made reliably with a simple structure, and the manufacturing process is easy, which contributes significantly to the miniaturization of the tape recorder.
There is no problem with the connection even if the positions of the wires 1, 791 and 1, 792 are slightly misaligned. Furthermore, when multiple operators and multiple sliders are connected by wires, slight contact between the wires will not impede operation.

Here, as the wires 76 and 77, for example, a piano wire or the like is suitable, but any other rigid material having some elasticity can be used.

Furthermore, connecting the operator and the slider with a wire is not limited to the case where there are multiple operators and sliders;
Needless to say, it can also be applied to the case of one piece. In this case, as shown in FIGS. 29a and 29b, the operator 811 may have a substantially convex shape and be supported by fitting into recesses 813, 813 formed in the cabinet 812. Steps 814 and 81 formed in the cabinet 812
4 may be held by pressing with an elastic member 815 such as a sponge.

Next, as described above, when the tuner pack is installed in the tape cassette storage section 28 and the tape-radio changeover switch 26 is switched to the radio side, the motor for running the tape is prevented from rotating. The fact that this motor does not rotate means that
This means that the reel stands 29, 30, capstan 50, etc. will not be rotated without any modification. However, since the playback operator 16 is operated when radio waves are received, the playback head 49, pinch roller 51, etc. are moved to the recess 3 of the tuner pack.
It is inserted in 6,37. Here, there is no problem with the playback head 49, but the pinch roller 51
Since the capstan 50, which is not rotated, continues to be pressed while receiving radio waves, there is an inconvenience that deformation occurs. For this reason, it is determined whether a tape cassette or a tuner pack is loaded in the tape cassette storage section 28, and in the case of a tape cassette, the pinch roller 51 is pressed against the capstan 50, and in the case of a tuner pack, the pinch roller 51 is pressed against the capstan 50.
A so-called pinch roller protection mechanism is required to prevent the roller from being pressed against the capstan 50.

FIG. 30 shows such a pinch roller protection mechanism. That is, the pinch roller 51 is connected to the tip 82 of the pinch lever 82 which has a substantially U-shaped side surface.
1,822, and is rotatably supported. This pinch lever 82 is rotatable in the directions of arrows K and L in the figure by a shaft 83 passing through its base end 823.
3 is fixed to a head chassis or the like of a tape recorder mechanism (not shown). The pinch lever 82 is normally biased in the direction of arrow L, and when the playback operator 16 is in the non-operating position, it is rotated in the direction of arrow K in the figure against the biasing force by the head chassis. The pinch roller 51 is spaced apart from the capstan 50 (not shown in FIG. 30). Further, when the playback operator 16 is operated, the head chassis moves in conjunction with the operation and separates from the pinch lever 82, so the pinch lever 82 rotates in the direction of arrow L, and the pinch roller 51 moves.
is pressed against the capstan 50.

Here, the lower tip 8 of the pinch lever 82 in the figure
22 is formed with a curved portion 824 that is slightly curved upward in the figure. As shown in FIG. 31, when the tuner pack is installed in the tape cassette storage section 28 and the playback operator 16 is operated, the pinch lever 82 is moved in the direction of arrow L in the figure, and its tip 822 is attached to the casing 33. It fits into the recess 37. Here, the thickness t of the wall surface 371 on the lower side in the figure constituting the recess 37 of the casing 33 is configured to be thicker than that of a normal tape cassette. Therefore, the curved portion 824 of the pinch lever 82 comes into contact with the wall surface 371 of the casing 33, preventing the pinch lever 82 from moving in the direction of arrow L, and the pinch roller 51 is held at a position separated from the capstan 50.

Furthermore, when a normal tape cassette is installed in the tape cassette storage section 28, the wall thickness of the portion of the tape cassette corresponding to the wall surface 371 is thin, so that the curved portion 824 of the pinch lever 82 can easily be inserted into the tape cassette. Pinch roller 5
1 is pressed against the capstan 50.

Therefore, the tip 822 of the pinch lever 82
A curved portion 824 is formed in the tape cassette storage portion, and the thickness t of the wall surface 371 constituting the recess 37 of the casing 33 is made thicker than that of a normal tape cassette so that it can engage with the curved portion 824. A pinch roller protection mechanism that identifies whether a tape cassette or a tuner pack is attached to the tuner pack 28 and prevents the pinch roller 51 from being pressed against the capstan 50 in the case of a tuner pack can be easily realized with a simple configuration. The tuner pack also has an electrode pin 47 on its bottom casing 35.
is installed protrudingly. Then, as shown in FIG.
Engaging means that the pinch lever 82 is not only prevented from moving in the direction of the arrow L, but also that the bottom casing 35 is pressed downward in the figure by the curved portion 824 in this state. For this reason,
The electrode pin 47 is pressed against the receiving electrode pin 70, so that a reliable connection can be achieved.

Further, when the playback operator 16 is returned to the non-operating position, the tip 822 of the pinch lever 82 comes out of the recess 37 of the casing 33, so that the tuner pack can be easily taken out.

Further, as a means of distinguishing between a tuner pack and a normal tape cassette, there is a protrusion 33 on one side of the tuner pack's casing 33, as shown in FIG.
form 1. And tape cassette storage section 28
One end 841 is bent into a substantially crank shape to correspond to the protrusion 331, and the spring 8
5 in the direction of the protrusion 331, that is, arrow M in the figure.
A detection member 84 biased in the direction is provided. The other end 842 of this detection member 84 is opposed to the tip 822 of the pinch lever 82 .

According to such a configuration, when the tuner pack is installed in the tape cassette storage section 28, the protrusion 331 of the casing 33 touches the one end 841 of the detection member 84.
Press. Therefore, the detection member 84 is slid against the biasing force of the spring 85. Then, the other end 842 of the detection member 84 is located near the tip 822 of the pinch lever 82, and the pinch lever 8
2 is prevented from moving in the direction of arrow L.
Further, when a tape cassette is installed in the tape cassette storage section 28, the detection member 84 is connected to the spring 8 because the tape cassette does not have the protrusion 331.
5 remains in the biased position. Therefore, the pinch lever 82 can be moved in the direction of arrow L, and the pinch roller 51 can be pressed against the capstan 50.

Here, the pinch lever 82 is engaged with the wall surface 371 of the casing 33 to not only prevent the pinch lever 82 from moving, but also to prevent the pinch lever 82 from moving, for example, as shown in FIGS. 33a and 33b. Predetermined engaging portions 861, 871 are attached to control members such as the head chassis 86 or the head slider 87.
The recess 37 of the tuner pack can be engaged with the engaging parts 861, 871, and the tuner pack can be pressed downward in the figure in the engaged state to press the electrode pin 47 against the receiving electrode pin 70. Of course, it is also possible to do so.

FIG. 34 shows another example of the pinch roller protection mechanism. That is, a recess 332 is formed in the lower part of the casing 33 of the tuner pack. In addition, through holes (not shown) are formed in the front and bottom plate 67 of the tape cassette storage section 28 at positions corresponding to the tips of the wall surface 371 constituting the recess 332 and the recess 37 of the casing 33, respectively. In this through hole, both pieces 88 of a detection member 88 having a generally U-shaped side surface are located opposite to each other.
1,882 are inserted through each. This detection member 88 is urged upward in the figure by springs 90, 90 that are engaged between its base 883 and the main chassis 89 of the tape recorder mechanism.

When the tuner pack is attached to the tape cassette storage section 28, the piece 881 of the detection member 88 is inserted into the recess 332 of the casing 33, so that the detection member 88 is pushed upward in the figure. At this time, the piece 882 of the detection member 88 is interposed between the wall surface 371 of the casing 33 and the tip portion 822 of the pinch lever 82 . Therefore, movement of the pinch lever 82 in the direction of arrow L in the figure is prevented,
The pinch roller 51 is not pressed against the capstan 50.

Further, when a tape cassette is installed in the tape cassette storage section 28, the piece 881 of the detection member 88 is pressed downward in the figure by one surface of the tape cassette. Therefore, the piece 882 of the detection member 88 is not interposed between the wall surface 371 of the casing 33 and the tip 822 of the pinch lever 82, and the pinch lever 82
is moved in the direction of arrow L in the figure, and the pinch roller 51
is pressed against the capstan 50.

FIG. 35 shows still another example of the pinch roller protection mechanism. That is, the wall surface 37 on the upper surface side in the figure that constitutes the recess 37 of the casing 33
2 is made thicker so as to correspond to the tip end 821 of the pinch lever 82. In this way, when the tuner pack is installed in the tape cassette storage section 28, the tip end 821 of the pinch lever 82 comes into contact with the wall surface 372 of the casing 33, and the pinch roller 51 is prevented from being pressed against the capstan 50. Furthermore, when the tape cassette is loaded into the tape cassette storage section 28, the portion of the tape cassette corresponding to the wall surface 372 is thin, so the tip 821 of the pinch lever 82 fits into the tape cassette and the pinch roller 51 is pressed against the capstan 50.

FIGS. 36a and 36b show other examples of the pinch roller protection mechanism. That is, the pinch lever 8 is attached to the upper and lower wall surfaces 372 and 371 of the recess 37 of the casing 33 in the figure.
Engagement portions 373 and 374 are formed that protrude in the direction of the tip portions 821 and 822 of the two ends, respectively. Then, the tip portions 821 and 822 of the pinch lever 82 are engaged with the engaging portions 373 and 374, and in the engaged state, the tuner pack is pressed so that its electrode pin 47 is pressed into contact with the receiving electrode pin 70. The engaging portions 825 and 826 to be obtained are formed.

When the tuner pack is attached to the tape cassette storage section 28, the engaging section 825 or 826 of the pinch lever 82 is connected to the engaging section 3 of the casing 33.
73 or 374, the pinch lever 82 is pressed downward in the figure so that the pinch roller 51 is not pressed against the capstan 50 and the electrode pin 47 of the tuner pack is pressed against the receiving electrode pin 70. The engaging portions 825 and 826 of the pinch lever 82 may simply support the tuner pack by the biasing force applied to the electrode pin 47 so that it does not separate from the tape cassette storage portion 28 upward in the drawing.

Furthermore, when a tape cassette is loaded in the tape cassette storage section 28, since there is no part of the tape cassette that corresponds to the engaging parts 373, 374, the pinch lever 82 is moved to the position where the pinch roller 51 is pressed against the capstan 50. It is possible to move up to. At this time, the engaging portion 82 of the pinch lever 82
5,826 also serves to hold down the tape cassette.

As described above, the casing 33 is formed with the engaging portions 373, 374 (protrusions) that come into contact with the pinch lever 82 (pinch roller support member), and the pinch lever 82 is formed with the engaging portions 373, 374 that engage with the engaging portions 373, 374. Combine the tuner pack into the tape recorder storage compartment 2.
The feature of this invention is that the engaging portions 825 and 826 are formed to be held within the holder 8.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as detailed above, according to this invention, it is possible to identify whether the tuner pack or the tape cassette is installed in the tape cassette storage section, and to prevent the pinch roller from coming into contact with the capstan when the tuner pack is installed. Therefore, it is possible to provide an extremely good protection mechanism for a tape recorder using a tuner unit that can prevent the pinch roller from deforming when the tuner pack is used.

[Brief explanation of the drawing]

Fig. 1 is an external view showing a tape recorder to which this invention is applied, Fig. 2 is an explanatory diagram of measures to prevent hearing loss used in the tape recorder, and Fig. 3 is a front view showing a modification of the measures to prevent hearing loss. Fig. 4 is an external view showing the tuner pack used in the same tape recorder, Fig. 5 a and b are a plan view and side view showing the positions of the electrode pins of the same tuner pack, respectively, and Fig. 6 is an electrode holder in the tape cassette storage section. 7 and 8 are respectively an exploded perspective view and a plan view showing the detailed structure of the same tuner pack, and FIGS. 9 and 10 are exploded perspective views showing the electrode pin attachment means, respectively. 11 and 12 are respectively a perspective view and a side sectional view showing the state in which the electrode pin is installed in the casing, and FIG.
15 are an exploded perspective view and a perspective view, respectively, for explaining a conventional electrode pin attachment means, and FIG. 16 is a side sectional view showing an electrode receiving part attachment means,
FIGS. 17a and 17b are a plan view and a side sectional view showing the detailed configuration of the electrode receiving section, respectively. FIG. 18 is a plan view showing the electrode receiving section installed in the tape recorder storage section, and FIG. 19 a and b are plan views showing other attachment positions of the electrode pins of the tuner pack, FIG. 20 is a perspective view showing the means for attaching the tuning dial of the tuner pack, and FIG. Exploded perspective view showing an example, No. 22
23 is a side sectional view showing the main parts of the cassette lid, FIG. 24 is a perspective view showing the shape of the volume adjustment knob, and FIG. 25 is the same. 26 is a side sectional view showing the means for attaching the volume adjustment operator to the cabinet; FIG. 26 is a perspective view showing the shape of a support plate used in the attachment means for the volume adjustment operator; FIG. FIG. 28 is a perspective view showing the connection means between the operator and the variable resistor; FIG. 28 is a side sectional view showing details of the connection means;
Figures 9a and 9b are side sectional views showing other examples of mounting means when there is only one volume adjustment operator, respectively.
31 is a perspective view and a side view showing one example of the pinch roller protection mechanism, FIGS. 32 and 33 a and b are a perspective view and a side view showing a modification of the same example, and FIG. 35 is a side view showing another example of the pinch roller protection mechanism; FIG. 35 is a side view showing still another example of the pinch roller protection mechanism;
Figures 6a and 6b are side views showing an embodiment of a protection mechanism for a tape recorder using a tuner unit according to this invention. 11... Cabinet, 12... Front cabinet, 13... Rear cabinet, 14... Rewind operator, 15... Fast forward operator, 16... Play operator, 17... Stop/eject operator, 18
...Talk operator, 19...Built-in microphone,
20, 21...Volume adjustment operator, 22...Battery indicator, 23...Tape type selection switch, 24...Noise reduction selection switch, 25...Radio indicator, 26...Tape-radio selection switch, 27 ... Headphone jack, 28 ... Tape cassette storage section, 2
9, 30...Reel stand, 31...Cassette lid, 3
2...Volume adjustment operator, 33...Casing,
34... Top casing, 35... Bottom casing, 36, 37... Recess, 38, 39... Insertion hole, 40... Receiving frequency display board, 41... Music selection dial, 42... Monaural-stereo changeover switch, FM stereo-monaural display section, 44... Indication section, 45, 46... Recessed part, 47... Electrode pin,
48... Electrode receiving part, 49... Reproduction head, 50
... Capstan, 51 ... Pinch roller, 52
...Printed wiring board, 53...Variable capacitor,
54... Screw, 55... Bevel gear, 56... Support stand, 57... Screw, 58... Nut, 59... Gear, 60... Holding plate, 61... Lug terminal, 62,
63... Decorative paper, 64... E-shaped ring, 65...
Spring, 67... Bottom plate, 68... Cassette guide pin, 69... Leaf spring, 70... Receiving electrode pin, 71... Screw, 72... Printed wiring board, 73
... Screw, 74 ... Shaft, 75 ... Support plate, 76,
77... Wire, 78, 79... Variable resistor body, 80... Holding plate, 82... Pinch lever, 8
3... shaft, 84... detection member, 85... spring, 86... head chassis, 87... head slider, 88... detection member, 89... main chassis, 90... spring.

Claims (1)

[Scope of utility model registration request] a tape cassette storage section having a bottom surface that faces a flat surface on one side of the tape cassette and on which the tape cassette can be placed; and a pinch roller support member for moving the pinch roller in a direction to bring it into contact with the capstan,
A tuner circuit is installed in a casing that can be attached to the tape cassette storage section, and a protrusion is formed at a position corresponding to the pinch roller support member to abut against the pinch roller support member and prevent movement of the pinch roller support member. and an engaging portion provided on the pinch roller support member to engage with a protrusion of the tuner unit and hold the tuner unit in the tape cassette housing. Protection mechanism for tape recorders.