JPS6317054Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cassette-type tape recorder in which a tape recorder body equipped with a reel drive shaft, etc., is provided with an erasing head which can be rotated via a pivot shaft and automatically moved inside a cassette holder. .

Conventionally, in order to further reduce the size of cassette tape recorders, in playback-only cassette tape recorders, a pinch drive was installed in a cassette holder rotatably attached to the tape recorder body equipped with a reel drive shaft, etc. A device in which rollers, a reproducing head, etc. are movable has been developed. If the cassette holder has a movable pinch roller, playback head, etc., it is necessary to install the pinch roller or playback head in advance when installing the tape cassette into the cassette holder which is open to the tape recorder body. The playback head can be kept inserted a predetermined amount into the tape cassette, and when the cassette holder is rotated to the playing position and the playback operation mode is obtained, the pinch roller and the forward movement of the playback head into the tape cassette can be maintained. The stroke can be made smaller, and the entire device can be made more compact.

If a recording function is to be added to a cassette-type tape recorder with the above configuration, an erasing head is naturally required, but if a permanent magnet is used for this erasing head, its mounting position must be precisely regulated. Must. That is, when the tape cassette is mounted on the cassette holder which is open to the tape recorder main body as described above, if the erasing head is inserted quite deeply into the tape cassette, it will be wrapped inside the tape cassette. A magnetic field that has an adverse effect on the recorded magnetic tape will act on it. Furthermore, even when the cassette holder is rotated from the open state to the playing state, the erasing head is maintained at a retracted position at a considerable distance from the magnetic tape in the tape cassette in order to prevent any adverse effects on the magnetic tape. must be done.

Therefore, the present invention has a simple structure that allows accurate regulation of the mounting position of the erasing head, which is necessary when a recording function is added, without hindering the demand for miniaturization of cassette tape recorders. This was proposed for the purpose of providing something that can reliably prevent adverse effects on magnetic tape.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

As shown in FIGS. 1 and 2, the cassette tape recorder constituting the present invention consists of a pair of reel drive shafts 1 and 2, a capstan shaft 3, etc., and a tape cassette 4, which are rotationally driven by a drive motor (not shown). The tape recorder main body 7 has a tape recorder main body 7 equipped with a tape drive means for driving a magnetic tape wound around a pair of tape reels 5 and 6 rotatably provided therein. Since the cassette tape recorder of the present invention has both recording and playback functions, a pair of microphone units 8 for the left channel and right channel are provided on one side of the tape recorder main body 7. , 9 are mounted via a mounting block 14 provided with a volume 10, earphone jacks 11, 12 and a microphone jack 13. Further, on the bottom side of the tape recorder main body 7, as shown in FIG. 3, a forward operation button 15, a recording operation button 16, a rewind operation button 17, a fast forward operation button 18, and a stop operation button 19 are provided.

A cassette lid 20 is rotatably mounted on the flat side of the tape recorder main body 7 having the above-described configuration, facing the reel drive shafts 1, 2 and the capstan shaft 3.
A cassette holder 21 is attached. This cassette holder 21 is inserted into both sides of the front side, which has openings into which the recording/reproducing head 22, the erasing head 23, the pinch roller 24 for pressing the capstan shaft 3, etc. of the tape cassette 4 enter, and holds this tape cassette 4. tape cassette 4
The cassette insertion portions 25, 2 are spaced approximately equal to the thickness of the cassette insertion portions 25, 2.
6 on both sides, and these cassette holding parts 27, 28
It has a connecting part 29 that connects the proximal ends of the. The cassette insertion side end face 30 of this connecting part 29 comes into contact with the end face of a bulging part 31 provided on the front side of the tape cassette 4 mounted on the cassette holder 21, and acts to restrict the mounting position of the tape cassette 4. do. The cassette holder 21 constructed as described above has rotating shafts 35 and 3 protruding from the outer surfaces of support pieces 33 and 34 that are planted on both sides of the back side of the chassis board 32 that constitutes the tape recorder main body 7.
6 is rotatably attached to the tape recorder main body 7 by passing through the insertion holes 37 formed at the proximal ends of the cassette holding parts 27 and 28.
Further, on the outer surfaces of the support pieces 33 and 34, arc-shaped pins 39 that are inserted into the base ends of the holding parts 27 and 28 of the cassette holder 21 engage with a position regulating pin 39 to regulate the rotation range of the cassette holder 21. concave groove 40
is drilled and selectively engages with a pair of engagement holes 41 and 42 provided on both sides of the holding parts 27 and 28 in accordance with the rotational operation of the cassette holder 21. An engaging ball 43 is provided which is biased outwardly by a spring constituting a click mechanism that can perform this intermittently. Cassette holder 2 configured in this way
1 is rotatable via the rotation shafts 35 and 36 within the range regulated by the concave groove 40, and is located at a first position opened from the tape recorder body 7 and toward the tape recorder body 7 side. closed second
It is rotated intermittently between the two positions.
Also, a rotation shaft 3 protruding from the support pieces 33 and 34 is provided.
At 5 and 36, a cassette lid 20 which is rotated integrally with the cassette holder 21 is attached to both side walls 43 and 4.
Insertion holes 46, 4 bored near the back wall 45 side of 4
7 can be inserted and installed. Note that the rotation axis 3
Support pins 48, 48 are screwed into the pins 5, 36 to prevent the cassette lid 20 from coming off.

The tape cassette 4 is inserted into and removed from the cassette holder 21 at the first position, which is opened from the tape recorder body 7 as shown in Fig. 1. When the tape cassette 4 is inserted into the cassette holder 21 and the cassette holder 21 is rotated toward the tape recorder body 7 to the play position shown in Fig. 2, in which the cassette holder 21 is closed, the reel drive shafts 1, 2 are inserted and engaged with the tape reels 5, 6 of the tape cassette 4, and the capstan shaft 3 enters the tape cassette 4 through the capstan insertion hole 49, setting the tape cassette 4 in a playable state.

By the way, the recording/reproducing head 22, the erasing head 23, and the pinch roller are located on the rotating shafts 35, 36 side of the cassette holder 21 configured as described above, that is, on the connecting portion 29 that connects the cassette holding portions 27, 28. 24 are arranged. The recording/reproducing head 22 is mounted on a rotating arm 52 whose one end is pivoted on a support shaft 51 which is pivoted on the side of the connecting part 29 which is connected to one cassette holding part 27.
A mounting board 53 is fixed and attached to the other end side with screws 54. This rotating arm 52 is
A torsion coil spring 55 is wound around the support shaft 51 and has one end 55a locked in a through hole 56 drilled in the connecting portion 29 and the other end 55b locked in one side of the rotating arm 52 as shown in FIG. It is urged to rotate in the direction of arrow A. Therefore, the recording/reproducing head 22 attached to this rotating arm 52 is operated by the forward operation button 15.
and/or when the recording operation button 16 is not operated, the tape cassette 4 is placed in a retracted position away from the tape cassette 4 mounted on the cassette holder 21, and when the forward operation button 15 and/or the recording operation button 16 are operated, the rotation is performed. The arm 52 is rotated in the direction of arrow B in FIG. 5 against the torsion coil spring 55 by a forward lever (not shown), enters the tape cassette 4, and moves to the forward position where it comes into sliding contact with the magnetic tape. The retracted position of the recording/reproducing head 22 is regulated by the distal end 52a of the rotary arm 52 being engaged with a position regulating step 58 of a locking block 57 provided on the connecting portion 29, and the forward position is regulated by the recording/reproducing head 22. - The tip of one of the screws 54 that fixes the playback head 22 to the rotating arm 52 is regulated by a long hole 59 formed in the chassis base plate 32 to which it is engaged.

A pinch roller 2 that presses against the capstan shaft 3 is attached to the support shaft 52 on which the rotating arm 52 is pivotally supported.
A pinch roller support arm 60 having a U-shaped cross section and having a pinch roller support arm 60 rotatably attached thereto is rotatably supported.
The other end 55b of the torsion coil spring 55 is locked on one side of the roller support arm 60, and similarly to the rotation arm 52, it is urged to rotate in the direction of arrow A in FIG. 15 and/or recording operation button 16 are not operated.
It is in a retracted position away from the capstan shaft 3.
The roller support arm 60 and the recording/reproducing head 2
Since a coil spring 61 is stretched between the mounting board 53 that attaches the rotary arm 52 to the rotary arm 52, the retracted position of the rotary arm 52 is regulated. When the arm 52 is rotated in the forward direction, it is rotated in the direction of arrow B in FIG.

Further, the erasing head 23 is attached via a head support member 63 that is rotatably supported by a support shaft 62 that is pivotally supported at the other end of the connecting part 29, which is the part connected to the other cassette holding part 28. It is being As shown in FIGS. 6, 7, and 8, this head support member 63 has a cylindrical pivot 64 on one end that is inserted through and supported by a support shaft 62 pivoted on the connecting portion 29. A head support portion 66 is connected to the other end via a connecting piece 65.
have. This head support portion 66 includes a pair of support pieces 69 having engaging protrusions 67 and 68 at their tips.
The erasing head 23, which is made of a permanent magnet and has a number 70, is attached by engaging the engagement holes formed in the erasing head 23 with the support pieces 69, 70. The head support member 63 to which the erasing head 23 is attached in this manner is rotatably attached to the cassette holder 21 with the pivot portion 64 being inserted and supported by the support shaft 62. Further, as shown in FIG. 9, the head support member 63 has a locking protrusion 71 provided on the back side of the connecting piece 65 and a tape guide 72 integrally attached to the tape cassette entry side attached to the connecting portion 29 of the cassette holder 21. A coil spring 75 is stretched between locking protrusions 74 provided on the back side of the formed tape guide block 73, and the cassette holder 2
The tape cassette 4 mounted on the tape cassette 1 is biased toward a retracted position away from the tape cassette 4 attached to the tape cassette 1. The head support member 63 to which the erasing head 23, which is urged in the direction of the backward position by the coil spring 75, is mounted.
As shown in FIGS. 9 and 10, on the back side of the connecting piece 65, a button 65 extends to the bottom side of the tape recorder main body 7 and is slidably operated by pressing a recording operation button 16, which is a recording operation member. A pin-shaped position regulating member 78 that stands up on the tip of the recording lever 77 abuts,
The retracted position of the head support member 63 is regulated. When the recording operation button 16 is pressed to enter the recording operation mode, the recording lever 77 slides in the direction of arrow C in FIG. The erasing head 23 is rotated about the support shaft 62 and moved to the forward position where it enters the tape cassette 4 mounted on the cassette holder 21 and comes into sliding contact with the magnetic tape. Further, when the stop operation button 19 is operated to switch from the recording operation mode to the stop mode, the recording lever 77 moves in the opposite direction of arrow C and returns to its original position. The head support member 63 is also moved back to the retracted position by the coil spring 75.

By the way, the recording lever 77 is the recording operation button 16.
does not move unless operated, so the position regulating member 78 is held at a fixed position. Therefore, the head support member 63 to which the erasing head 23 is attached can be opened from the tape recorder body 7 as shown in FIG. It maintains a constant retracted position regardless of whether it is in the open position or not. In particular, the position regulating member 78 that is erected at the tip of the recording lever 77 is connected to the pair of rotation shafts 35 and 36 whose tips are the center of rotation of the cassette holder 21.
By setting the height H so that it faces on the center line connecting the cassette holder 21, the head support member 63 attached to the cassette holder 21 can follow the rotation operation of the cassette holder 21 and move back in a predetermined manner without changing its position. It is supported by the position regulating member 78 at this position.

Furthermore, when the cassette holder 21 is in the open position shown in FIG.
Even when the tape cassette is operated, the accidental erasure prevention claw of the tape cassette is not detected by the accidental erasure prevention claw detection piece provided on the tape recorder main body 7. The recording lever 77, which becomes operable upon detection of the erroneous erasure prevention claw, becomes unable to move forward (in the direction of arrow C in FIG. 10). Therefore, when the cassette holder 21 is in the open position, the erasing head 23 is not moved to the forward position.
Since the magnetic tape does not come into contact with the magnetic tape, a constant distance is maintained, and an adverse effect on the magnetic tape can be prevented.

According to the present invention as described above, it is possible to construct a cassette type tape recorder with a recording function added thereto without hindering the demand for miniaturization required for the cassette type tape recorder.
The mounting position of the erasing head is regulated by a pin-shaped position regulating member that stands up on the recording operation member.The structure is extremely simple, and the erasing head always remains in a constant position depending on the operation mode of the tape recorder. Therefore, it is possible to reliably prevent the magnetic tape from being adversely affected by the erasing head.

In particular, in the case of the present invention, the position of the erasing head is controlled by a position regulating member that stands up on the recording operation member, so there is no need to provide any separate position regulating member on the cassette holder, etc., and the recording function is The configuration does not become complicated due to the addition of .

[Brief explanation of the drawing]

Fig. 1 shows a cassette tape recorder according to the present invention, and is a perspective view with the cassette holder open, Fig. 2 is a perspective view with the cassette holder closed, and Fig. 3 is a perspective view showing the cassette holder in an open state. FIG. 4 is an exploded perspective view showing the cassette holder removed, and FIG. 5 is a perspective view of the cassette holder. 6, 7 and 8 show the head support member, FIG. 6 being a plan view thereof, FIG. 7 being a rear view thereof, and FIG. 8 being a sectional view thereof. 9 is a partial perspective view showing the state in which the erasing head is attached to the cassette holder, FIG. 10 is a side view showing the regulated state of the erasing head with the cassette holder closed, and FIG.
The figure is a side view showing the regulated state of the erasing head with the cassette holder open. 4...Tape cassette, 7...Tape recorder main body, 21...Cassette holder, 23...Erasing head, 29...Cassette holder connection part, 35,
36...Rotating shaft, 63...Head support member, 62
... Support shaft of the head support member, 75 ... Coil spring, 77 ... Recording lever, 78 ... Position regulating member.

Claims (1)

[Scope of utility model registration request] The tape cassette is rotatably attached to the tape recorder body via a rotation shaft, and the tape cassette can be loaded or unloaded while being opened from the tape recorder body, and the tape cassette can be rotated to the playing position of the tape recorder body. It has a cassette holder in which a reel drive shaft provided on the tape recorder main body is inserted into the installed tape cassette, and there is a rotation axis side of the cassette holder with a forward position and a backward position. an erase head that moves between the two positions, the erase head being biased by a spring toward a retracted position;
A position regulating member that stands up from a recording operation member provided on the tape recorder body comes into contact with the support member of the erasing head to regulate the retreating position of the erasing head when the cassette holder is in the open position and the playing position. A cassette type tape recorder characterized by: