JPH0519218B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing device, and more particularly to an automatic forward/reverse switching and automatic stopping mechanism.

Conventional Technology In recent years, tape recorders have been equipped with an automatic forward/reverse switching mechanism to save long-time recording and the hassle of replacing side A and B of the cassette half, allowing continuous playback and continuous recording, and are also portable. There is a demand from the market for a small and lightweight product with an emphasis on In particular, microcassette tape recorders are small and lightweight, making them suitable for long-term recording of meetings and the like.

An example of the above-mentioned conventional microcassette tape recorder will be described below with reference to the drawings.

9, 10, and 11 show a tape end detection mechanism of a conventional microcassette tape recorder. In FIG. 9, reference numeral 1 denotes a flywheel, which is rotated clockwise by the rotational force of a motor (not shown) via a belt (not shown). The rotating shaft of the flywheel 1 is configured as a capstan shaft 2, and a gear 3 is provided around the root of the capstan shaft 2. A gear 5 having a small gear 4 transmits the operating force of the gear 3 to a gear 7 having a cam portion 6.

A reel stand holding plate 12 is attached to the pins 10 and 11 on the substrate 9, and the long holes 12a and 12b are connected to the pins 10 and 11 on the substrate 9.
It is supported movably in the direction of the arrow AB by an engagement relationship of 0 and 11, and is normally urged in the direction A by a tension spring 13.

A supply reel stand 8 is rotatably mounted on the reel stand holding plate 12. Reference numeral 14 denotes an operating lever that transmits the movement of the reel stand holding plate 12 to the movable body 15, and is rotatably held by a pin 16 on the base plate 9.

The movable body 15 is connected to the pin 17 on the board 9 and the movable body 15
It is rotatably and slidably attached in contact with the elongated hole 15a, and is biased in the C direction and clockwise by the tension spring 18, so that the part 15b of the movable body 15 moves into one part of the operating lever 14. It is pressed against the portion 14a. 1
Reference numeral 9 denotes a lock lever, which is rotatably held by a pin 20 on the base plate 9 and biased to rotate counterclockwise by a tension spring 21, so that the bent portion 19a of the lock lever 19 is attached to a portion 22a of the operating member 22. It is in pressure contact with. Further, the operating member 22 has elongated holes 22a, 22
b is biased in the E direction by a tension spring 25 due to the engagement relationship between pins 23 and 24 on the substrate 9.

The operation of the tape end detection mechanism of the microcassette tape recorder constructed as described above will be explained below.

First, at the end of the tape in the playing state, the reel stand holding plate 12 holding the supply reel stand 8 is moved in the B direction against the tension spring 13 by the tape driving force caused by the pressure contact between the capstan shaft 2 and the pinch roller (not shown). Move to.

As the reel stand holding plate 12 moves, a portion 14b of the operating lever 14 and a portion 12c of the reel stand holding plate 12 come into contact with each other as shown in FIG. 10, so that the operating lever 14 rotates clockwise. A part 14a of the operating lever 14 is a part 15b of the movable body 15.
and rotates the movable body 15 counterclockwise,
A portion 15c of the movable body 15 comes into contact with the cam portion 6 of the gear 7.

Further, the rotational force of the flywheel 1 is transmitted to the cam part 6 by the meshing of the gears 3 and 5, and the small gear 4 and the gear 7 on the gear 5, and the cam part 6 rotates clockwise, and the part 6a of the cam part 6 and the movable body A portion 15c of the movable body 15 comes into contact with the movable body 15, and due to the rotational force of the cam portion 6, the movable body 15 moves in the direction D against the tension spring 18. Movable body 15
moves in the D direction, and a portion 15d of the movable body 15 comes into contact with a portion 19a of the lock lever 19, causing the lock lever 19 to rotate clockwise against the tension spring 21.

As the lock lever 19 rotates as shown in FIG.
The engagement with the part 22c of the operating member 22 is released, and the operating member 22 is moved in the E direction by the tension spring 25, and is in a stopped state.

Problems to be Solved by the Invention However, with the above configuration, the operation member is only unlocked at the end of the tape, and the operation changes from the playback state to the stop state and from the recording state to the stop state. Long-time recording, which is more strongly requested, and cassette half A
The problem is that it does not have a structure that can provide an automatic forward/reverse switching mechanism that saves the labor of replacing the side and the B side.

In view of the above-mentioned problems, the present invention has been developed to reduce the overall size of the device.
It is lightweight and has a simple configuration, making it suitable for long-time recording, and it meets market needs with automatic forward/reverse switching that eliminates the need to replace side A and B of the cassette half, and automatic stop at the end of the tape. The object of the present invention is to provide a magnetic recording/reproducing device.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention includes a rotating body that rotates in association with the running of a magnetic tape and a movable body that is normally separated from the rotating body. an operating means for bringing the movable body into contact with the rotary body using the tape driving force generated by the pressure contact between the capstan and the pinch roller when the magnetic tape finishes running; a moving member that holds the movable body movably; and a detecting member. It has a selection means for positioning the movable member from the first position to the second position depending on the presence or absence of detection, and when the movable body abuts the rotating body in the first position by the operating means, the operation of the rotating body is The movable body is moved in the first direction by the power, actuating the first operated member (direction/reverse switching mechanism), the movable body is positioned at the second position by the selection means, and the movable body is positioned at the second position by the selection means. The position of the moving member causes the movable member to move in the second direction due to the operating force of the rotating member and actuate the second operated member (automatic stop mechanism) when it comes into contact with the rotating member. It has a configuration that allows selection of the direction of movement.

Effects The present invention, with the above-described configuration, allows the selection of the forward/reverse switching means and the automatic stopping means depending on the state of the moving member, thereby eliminating the need for a separate mechanism or member for selection. The configuration can be greatly simplified and downsized.

Embodiment A magnetic recording/reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows automatic forward/reverse switching at the end of a tape in a magnetic recording/reproducing apparatus according to a first embodiment of the present invention.
This shows the automatic stop selection mechanism.

In FIG. 1, 26 is a flywheel, which is connected to a motor (not shown) via a belt (not shown).
It is rotated clockwise by the rotational force of. The rotating shaft of the flywheel 26 is configured as a capstan shaft 27, and a gear 28 is provided around the root of the capstan shaft 27. Small gear 2
A gear 30 having a number 9 transmits the operating force of the gear 28 to a gear 32 having a cam portion 31. The reel stand holding plate 3 is attached to the pins 34 and 35 on the board 33.
6 is the elongated hole 36a, 36b and the pin 34,
35 so as to be movable in the direction of the arrow GH, and is normally biased in the G direction by a tension spring 37. A supply reel stand 38 is rotatably mounted on the reel stand holding plate 36. Reference numeral 39 denotes an operating lever that transmits the movement of the reel stand holding plate 36 to the movable body 40, and is rotatably held by a pin 41 on the base plate 33. Movable body 40
is rotatably and slidably attached to the pin 41 on the movable member 46 and the elongated hole 40a of the movable body 40 in contact with each other, and is biased in the I direction and clockwise by the tension spring 42, A portion 40b of the movable body 40 is in pressure contact with a portion 39a of the operating lever 39.

42 is a lock lever and pin 4 on the board 33
The pin 4 on the substrate 33 is rotatably held by the pin 3 and biased to rotate counterclockwise by the tension spring 44.
Rotation is restricted by 5. The moving member 46 has elongated holes 46a, 46b and pins 47, 48 on the substrate 33.
It is biased in the K direction by the tension spring 49 due to the engagement relationship with. Also, 50 is a recording member,
Long holes 50a, 50b and pins 51, 5 on the board 33
2, it is biased in the M direction by a tension spring 53. The actuating plate 54 has a long hole 54a,
54b and the pins 55, 56 on the substrate 33 so as to be slidably attached in the direction of the arrow MN. Further, a spring 58 is applied so that the end 50c of the recording member 50 and the pin 57 on the actuating plate 54 abut and engage with each other.
are elastically connected. 59 is a detection member which is rotatably held by a pin 60 on the board 33 and is attached clockwise by a torsion coil spring 61 when the safety piece 81 (shown in FIG. 5) on the side of the cassette half B is not present. Rotation is restricted by a pin 62 on the board 33. Further, when the safety piece 81 is present, the end portion 81a of the safety piece 81 and a portion 59a of the detection member 59 are in contact with each other, as shown in FIG. A selection member 63 is rotatably held by a pin 64 on the substrate 33.

65 is a forward/reverse switching member. In FIG.
Arrow OP due to engagement with upper pins 66 and 67
It is attached so that it can slide freely in the direction. A spring 68 moderates the movement of the forward/reverse switching member 65, and is normally biased in the O direction. Reference numeral 69 denotes a slide switch that switches the rotation direction of the motor (not shown) between forward and reverse rotation, and when the forward/reverse switching member 65 slides in the direction of arrow OP, the slide switch 69 is switched by coming into contact with the ends 65c and 65d. switches, causing the motor (not shown) to rotate forward or reverse. 7
0 is a head block equipped with a forward recording/reproducing head 71, an erasing head 72, a reversing recording/reproducing head 73, and an erasing head 74, and a pinch roller 76 is rotatably held by a pin 75.

Further, the elongated hole 70a of the head block 70 is connected to the substrate 3.
It is in engagement relationship with a pin 79 on a lever 78 rotatably attached by a pin 77 on the lever 3 . The spring 80 applies a biasing force to the headblock so as to press the pinch roller 76 against the capstan shaft 27.

The operation of the magnetic recording/reproducing apparatus configured as described above will be described below.

First, in FIG. 1, the reel stand holding plate 36 holding the supply reel stand 38 resists the tension spring 37 due to the tape driving force generated by the pressure contact between the capstan shaft 2 and the pinch roller (not shown) at the end of the tape in the playing state. and move in the H direction. As the reel stand holding plate 36 moves, the part 39b of the operating lever 39 comes into contact with the part 36c of the reel stand holding plate 36, and the operating lever 39 rotates clockwise.
a comes into contact with a part 40b of the movable body 40, and the movable body 4
0 in the counterclockwise direction, and a portion 40c thereof comes into contact with the cam portion 31 of the gear 32. Also, the cam part 31
The rotational force of the flywheel 26 is transmitted through the meshing of the gears 28 and 30, and the small gear 29 and gear 32 formed integrally with the gear 30, and rotates clockwise, movable with a part 31a of the cam portion 31. body 40
The movable body 40 is moved in the R direction as shown in FIG. 4 against the tension spring 42 due to the rotational force of the cam portion 31. As the movable body 40 moves in the R direction, a portion 40a of the movable body 40 changes to a portion 65a of the forward/reverse switching member 65 as shown in FIG.
The forward/reverse switching member 65 is brought into contact with the
The forward/reverse switching member 65 is urged in the P direction by the spring 68. At this time, the ends 65e, 65f of the forward/reverse switching member 65 and the head block 7
When the forward/reverse switching member 65 is biased in the P direction due to the engagement relationship with the ends 70b and 70c of 0, it enters the inverted state shown in FIG.

In FIG. 7, while the forward/reverse switching member 65 is moving in the P direction, the end 65g of the forward/reverse switching member 65 and the lever 7
8 shows a mechanism in which the pinch roller 76 and the capstan shaft 27 are brought into a state of primary separation by the abutting relationship between the pinch roller 76 and the capstan shaft 27. A reel stand holding plate 36 that holds the supply reel stand 38 by tape driving force when the separated state is reached.
The force that was biasing the reel in the H direction is released, and the reel stand holding plate 36 is moved and biased in the G direction by the tension spring 37. In addition, the operating lever 39 and the movable body 4
0 returns to the original state shown in FIG. 1 due to the biasing force of the tension spring 42. Further, the switching part 69a of the slide switch 69 comes into contact with the end 65c of the forward/reverse switching member 65 and slides in the P direction, so that the rotation direction of the motor (not shown) is reversed, the flywheel 26 is reversed, and a reverse running state is established. Become.

Next, the recording state will be explained. First, if there is no safety piece on the A side of the cassette half, the A side safety piece detection member (not shown) detects that there is no safety piece and prevents the recording member 50 from moving in the N direction. An A-side safety piece detection member (not shown) is configured.

If there is a safety piece on the A side of the cassette half and there is also a safety piece on the B side, when a recording operation is performed, the recording member 50 moves in the N direction and is locked by a locking means (not shown) into the fifth The operating plate, which is held in the state shown in the figure but is elastically connected to the recording member 50 by a spring 58, is moved as shown in FIG. A portion 59b of the detection member 59 and a portion 54c of the actuation plate 54 come into contact with each other to prevent the actuation plate 54 from moving in the N direction. Therefore, when there is a safety piece on the A side of the cassette half and there is also a safety piece on the B side, the position of the movable member 46 when recording is performed will be as shown in Figures 1 and 4, and as described above. As in the playback state, A
At the end of the tape on the side, the forward/reverse switching member 65 is activated.
screen recording will start automatically.

Next, if there is a safety piece on side A of the cassette half and no safety piece on side B, the actuating plate 54 moves in the N direction during recording as shown in FIG.
The moving member 46 is rotated clockwise to pull the tension spring 4
9 in the L direction and hold it there. And A
At the end of the tape on the surface, the movable body 40 moves in the T direction as shown in FIG. and part 4 of the movable body 40
0d comes into contact with a portion 42a of the lock lever 42, and by rotating the lock lever 42 clockwise against the tension spring 44, the portion 19a of the lock lever 19 and the operating member are rotated as shown in FIG. 11 of the conventional example. The engagement with part 22c of 22 is released, and the operation member 22 moves in the E direction by the tension spring 25 and comes to a stopped state. Therefore, when the cassette half has a safety piece on side A and no safety piece on side B, the position of the movable member 46 when recording is performed is as shown in Figure 2.
As shown in FIG. 3, the operation member is unlocked at the end of the tape on side A of the cassette half, and the operation member is in a stopped state.

As described above, according to this embodiment, the cam part 31 rotates in relation to the running of the magnetic tape, and the cam part 3
1, a movable body 40 that is normally separated from the cam part 31, an operation means (reel stand holding plate 36, operation lever 39, etc.) that brings the movable body 40 into contact with the cam part 31, and a movable body 40 that movably holds the movable body 40. a moving member 46,
It has a selection means (a selection member 63, an actuating plate 54, etc.) that positions the movable member 46 from the K position to the L position depending on the presence or absence of detection by the detection member 59.
1, the movable body 40 moves in the R direction by the operating force of the cam portion 31, and the forward/reverse switching member 65
Activate. Also, the movable body is set to L by the selection means.
When the movable body is positioned at the position and abuts against the cam portion 31 by the operating means, the movable body moves in the T direction by the operating force of the cam portion 31, and the movable body 4 is moved by the position of the movable member 46 so as to operate the lock lever 42.
0 movement direction, and the forward/reverse switching means and automatic stopping means are selected depending on the state of the moving member, thereby eliminating the need for separate mechanisms and parts for selection. Therefore, the configuration of the device can be significantly simplified and the device can be made smaller.

A second embodiment of the present invention will be described below.

In the first embodiment, the case of a micro cassette tape recorder has been described, but a compact cassette tape recorder can also be constructed in the same manner and the same effects can be obtained. In that case, the safety piece is on the side of the cassette half in the micro cassette, but the safety piece is on the back of the cassette half in the compact cassette, so the detection member 59
The same effect can be obtained by arranging the detection member 59 on the back side of the cassette half and making the contact relationship between the detection member 59 and the actuation plate 54 the same as in the first embodiment.

In the first embodiment, there is a safety piece (not shown) on the A side of the cassette half, and a safety piece 81 on the B side.
When the recording operation was performed when there was no recording operation, the movable body 40 was slid at the end of the tape on side A to release the lock of the operating member and be in a stopped state, but the movable body 40
At 0, the recording member, which is configured separately from the locking means of the operating member, is unlocked, and at the same time, the forward/reverse switching member 65 is activated, so that side B playback can be automatically started at the end of the tape on side A. .

Effects of the Invention As described above, the present invention includes a rotating body that rotates in association with the running of a magnetic tape, a movable body that is normally separated from the rotating body, and a movable body that is connected to a capstan when the magnetic tape finishes running. The movable member is moved to the first position based on the operation means that brings the rotating body into contact with the tape drive force generated by pressure contact with the pinch roller, the movable member that movably holds the movable body, and the presence or absence of detection by the detection member. and a selection means for positioning the movable body to the second position, and when the movable body is brought into contact with the rotating body by the operating means at the first position,
The operating force of the rotating body moves the movable body in the first direction to actuate the first operated member, and the movable body is positioned at the second position by the selection means, and the operating force moves the movable body in the first direction. When the movable body comes into contact with the second direction, the operating force of the rotary body moves the movable body in the second direction.
The moving direction of the movable body is selected depending on the position of the movable member such that the operated member is actuated, so that the forward/reverse switching means and the automatic stopping means can be selected depending on the state of the movable member. By doing so, there is no need for a complicated configuration for bringing the movable body and the rotating body into contact, and there is no need for separate mechanisms or members for selection and end detection, which greatly simplifies the configuration of the device. , and downsizing can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts of a magnetic recording/reproducing apparatus according to the first embodiment of the present invention, FIG. 2 is a plan view of the main parts when the selection member 63 of FIG. 1 is activated, and FIG. FIG. 4 is a plan view of the main part showing when the operating member operates when the moving member 46 in FIG. 1 is in the L position, and FIG. FIG. 5 is a plan view of the main part, and FIG. 5 is a plan view of the main part showing the movement of the actuating plate 54 when the detection member 59 of FIG.
7 and 8 are principal part plan views showing the engagement relationship between the forward/reverse switching member 65 and the head block 70, and FIG. 9 is a principal part plan view of the tape end detection mechanism of a conventional microcassette tape recorder. , FIG. 10 is a plan view of the main part when the operating member of FIG. 9 is activated, and FIG. 11 is a plan view of the main part showing how the automatic stop works at the end of the tape in FIG. 9. 31...Cam part, 36...Reel stand holding plate, 3
8... Supply reel stand, 39... Operation lever, 40
... Movable body, 42 ... Lock lever, 46 ... Moving member, 54 ... Actuation member, 59 ... Detection member,
63... Selection member, 65... Direct/reverse switching member, 81
...B-side safety piece.

Claims (1)

[Claims] 1. A rotating body that rotates in association with the running of a magnetic tape, and a movable body that is normally separated from the rotating body;
an operating means for bringing the movable body into contact with the rotary body by a tape driving force generated by pressure contact between a capstan and a pinch roller when the magnetic tape finishes running; a moving member movably holding the movable body; and a detection member. It has a selection means for positioning the movable member from the first position to the second position depending on the presence or absence of detection, and when the movable body comes into contact with the rotating body by the operating means in the first position, the operating force of the rotating body is When the movable body moves in the first direction and actuates the first operated member, and when the movable body is positioned at the second position by the selection means and comes into contact with the rotating body by the operation means, The movable body is configured to move in the second direction by the actuation force of the rotary body, and the direction in which the movable body moves can be selected depending on the position of the movable member so as to actuate the second operated member. A magnetic recording/reproducing device characterized by: 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the first operated member is a member for switching between forward and reverse directions. 3. The magnetic recording and reproducing apparatus according to claim 1, wherein the second operated member is a member for unlocking.