JP2867415B2 - Tape loading mechanism of magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading operation when a magnetic tape is pulled out of a cassette to form a predetermined tape running path in a magnetic recording / reproducing apparatus such as a VTR.

2. Description of the Related Art FIGS. 9 to 13 show a tape loading mechanism of a conventional magnetic recording / reproducing apparatus. FIG. 9 is a diagram showing a first embodiment of a conventional magnetic recording / reproducing apparatus, in which fast forward and rewind of a magnetic tape are performed. In FIG. 9, reference numeral 1 denotes a cassette having a pair of reels (not shown) around which a magnetic tape 2 is wound. In the figure, the magnetic tape 2 is represented by a single line for convenience (the same applies to other drawings). Each of the reels is engaged with the supply-side reel base 3 and the take-up reel base 4, and the rotation of the two reel bases rotates the reels so that the magnetic tape 2 runs. Reference numeral 5 denotes a supply-side brake arm, and reference numeral 6 denotes a winding-side brake arm, which is rotatably locked around support shafts 7 and 8. A tension spring 9 is stretched between the two brake arms, and presses each brake arm against both reel bases to urge the brake bases to perform the braking operation. Reference numeral 10 denotes an electromagnetic solenoid which is engaged with one end of the take-up brake arm 6. When the electromagnetic solenoid 10 is excited, the brake arm 6 rotates counterclockwise around the support shaft 8 and separates from the take-up reel base 4. At the same time, one end of the winding-side brake arm 6 presses the projection of the supply-side brake arm 5, and as a result, the supply-side brake arm 5 rotates clockwise around the support shaft 7, and Will be separated from When the excitation of the electromagnetic solenoid 10 is stopped, the winding-side brake arm 6 rotates clockwise around the support shaft 8 due to the tension of the tension spring 9 and presses against the winding-side reel base 4. At the same time, the supply side brake arm 5 rotates counterclockwise around the support shaft 7 and presses against the supply side reel base 3. Reference numeral 11 denotes a slot provided on the base, along which the loading base 12 is slidably engaged. Tape post 13 on loading base
And the magnetic tape 2 is pulled out as the loading base 12 slides along the elongated hole 11. The loading base 12 is pressed against and fixed to the post stopper 14, and the magnetic tape 2 is wound around the rotating drum 49 to form a predetermined tape path.

11 and 12 are views showing the sliding means of the loading base. In FIG. 11, the loading base 12
Although not shown, is formed of a member having a width larger than the length of the long hole through the long hole 11 and is slidably locked without coming off from the long hole. 17 is a gear and a spindle 18
Is rotatably locked around. 19 and 20 are pins
The arm is rotatably engaged at 21, the arm 20 is rotatably engaged with a boss provided on the loading base 12, and the arm 19 is locked by the gear 17. 22 is a gear
The gear meshes with the gear 17 and is rotatably locked around the support shaft 18. Arms 23 and 24 are rotatably engaged with pins 25, the arm 24 is rotatably engaged with a boss provided on the loading base 12, and the arm 23 is a gear.
Locked to 22. Another gear 26 is formed on the gear 22 and meshes with the sector gear 27. Sector gear 27
Is rotatably locked around a support shaft 28, and a pin 29
have. Reference numeral 30 denotes a first gear with a cam, and a support shaft 31
And a cam groove 32 is formed. The pin 29 is engaged with the cam groove 32, and the sector gear 27 is rotated with the rotation of the cam gear 30. In this configuration, when the cam gear 30 is rotated counterclockwise around the spindle 31 by a motor (not shown), the sector gear 27 rotates clockwise, the gear 22 counterclockwise, and the gear 17 clockwise. Rotate each. As a result, the loading base 12 slides along the elongated hole 11.
The twelfth shows a state where the loading base 12 abuts on the post stopper 14 and the sliding operation is completed.

In FIG. 9, reference numeral 15 denotes a capstan rotating shaft, which can rotate at a predetermined cycle. 16 is a pinch roller,
It can be pressed against the capstan rotation shaft 15 via a magnetic tape. In FIG. 9, a gap is formed between the pinch roller and the capstan rotating shaft. Although the means for pressing the pinch roller against the capstan rotating shaft is not shown in FIG. 9, it can be realized by using an electromagnetic solenoid, as shown in, for example, Hi-Fi Tape Recorder (Radio Engineering) P188 by Masahiko Morizono. It is. A control head 33 records and reproduces control signals on a magnetic tape. FIG. 10 shows the case where the loading operation is completed.
FIG. 10 is a diagram showing a second state, in which a recording / reproducing operation is performed in this mode. In FIG. 10, the pinch roller 16 is in pressure contact with the capstan rotating shaft 15 via a magnetic tape.

FIG. 13 shows the timing of the pressing operation of the brake on the reel base and the timing of pressing the pinch roller on the capstan rotating shaft in the above loading operation.

SUMMARY OF THE INVENTION However, in the above-described configuration, during the transition from the first mode to the second mode, before the pinch roller is pressed against the capstan rotating shaft, both brake arms are mounted on the reel base. Separate from. Further, during the transition from the second mode to the first mode, the brake arm is separated from the reel base even after the pinch roller is separated from the capstan rotation axis. Therefore, when the magnetic tape is pulled out of the cassette and stored in the cassette, the magnetic tape is fed or wound from the take-up reel base, and the position of the magnetic tape at the control head moves. In particular, when performing high-precision editing, it is necessary to read and control the control signal recorded on the magnetic tape.If the control signal is shifted between the recording / reproducing operation and the fast-forward / rewind operation, the editing point is shifted, resulting in a high-precision. There was a problem that editing was not possible.

Means for Solving the Problems To solve the above problems, a magnetic recording / reproducing apparatus according to the present invention comprises a supply-side reel stand and a take-up-side reel stand, and a supply-side brake arm that presses against each of the reel stands to perform a braking operation. And a take-up side brake arm, a magnetic tape in the cassette, a tape post forming a predetermined tape path, a control head and a capstan, and a pinch roller. The tape post pulls out the magnetic tape halfway. Is movable between a position forming the first form and a position forming the second form forming a predetermined tape path, and is wound when transitioning from the first form to the second form. Before the side brake arm separates from the take-up reel base, the pinch roller completes pressure contact with the stopped capstan, and shifts from the second mode to the first mode. In this case, the take-up brake arm is configured to complete the pressure contact with the take-up reel base before the pinch roller separates from the capstan in the stopped state when performing.

Alternatively, a self-holding solenoid that engages with the brake arm and realizes the braking operation of both brake arms at the time of excitation and releases both brakes by being pressed to the self-holding position and thereafter holds the releasing operation And a member for performing an operation of pressing the self-holding type solenoid to the self-holding position and an operation of engaging with the supply side brake arm and separating only the supply side brake arm from the supply side reel base.

Effect of the Invention According to the above configuration, when transitioning from the first mode to the second mode, at the beginning of the transition, the take-up brake arm brakes the take-up reel base and the magnetic tape is pulled out from the supply-side reel. After that, the magnetic tape is fixed by the pinch roller and the capstan rotating shaft, and then the winding arm on the winding side is separated from the reel base, so that no deviation of the magnetic tape occurs in the control head. Also, when shifting from the second mode to the first mode, the take-up brake arm is completely pressed into contact with the reel base by the time the pinch roller separates from the capstan rotation axis. The magnetic tape is not wound, and the magnetic tape is not disengaged by the control head, so that the position of the magnetic tape on the control head does not change between the first mode and the second mode. Therefore, high-accuracy editing work using the control head becomes possible.

Embodiment Hereinafter, a magnetic recording / reproducing apparatus according to the present invention will be described with reference to the drawings. 1 to 8 show an embodiment of the present invention. 1 and 2 show a first embodiment of the present invention. First
FIG. 2 is a plan view of a tape loading mechanism of the magnetic recording and reproducing apparatus according to the first embodiment. In FIG. 1, 1 to 8, 11
16, 33 and 40 are the same as in the conventional example shown in FIG. Numeral 34 denotes an electromagnetic solenoid, which is provided with a compression spring 35 which is engaged with the supply side brake arm 5 and is a return spring of the bobbin. Numeral 36 denotes an electromagnetic solenoid, which is provided with a compression spring 37 which is engaged with the winding side brake arm 6 and is a return spring of the bobbin. When each electromagnetic solenoid is excited in this configuration, the supply-side brake arm 5 rotates clockwise and separates from the supply-side reel base 3, and the winding-side brake arm 6 rotates counterclockwise to rotate the supply-side reel base. Separated from 4. When the excitation of each electromagnetic solenoid is stopped, the supply-side brake arm 5 rotates counterclockwise by the return springs 34 and 36 and presses against the supply-side reel base 3, and the take-up brake arm 6 rotates clockwise. Then, it is pressed against the take-up reel base 4.

FIG. 2 shows the timing of the operation of the brake arm and the operation of the pinch roller between the first mode and the second mode in the tape loading of the first embodiment. In FIG. 2, when shifting from the first mode to the second mode, the supply side brake arm is separated from the supply side reel base,
Since the take-up side brake arm is in pressure contact with the take-up side reel base, it is pulled out from the magnetic tape supply side reel. Then, after the pinch roller is pressed against the capstan rotating shaft, the take-up brake arm is separated from the take-up reel base. At this time, if the capstan rotating shaft is stopped, the magnetic tape is sandwiched between the capstan rotating shaft and the pinch roller, the magnetic tape is not pulled out from the take-up reel, and the tape is not shifted by the control head. . Further, when shifting from the second mode to the first mode, the take-up side brake arm is pressed against the take-up reel base and then the pinch roller is separated from the stopped capstan rotating shaft in the stopped state. The reel does not rotate and the position of the tape at the control head does not shift.

3 to 8 show a second embodiment of the present invention. FIG. 3 is a plan view of a tape loading mechanism of the magnetic recording / reproducing apparatus according to the second embodiment. In FIG. 3, 1
-9, 11-33 and 49 are the same as in the conventional example. Reference numeral 33 denotes a self-holding solenoid, and one end 38a of the bobbin presses the winding-side brake arm 6 and is rotatably positioned. When the other end 38b of the bobbin is pressed rightward, the bobbin moves, and at 38a, the take-up brake arm 6 is rotated counterclockwise to separate from the take-up reel base. At the same time, the supply side brake arm 5 is separated from the supply side reel base as in the conventional example of FIG. Even if the pressing of the portion 38b is stopped by the magnet inside the self-holding solenoid 38, the separated state of the brake is maintained. When the self-holding solenoid 38 is excited, the bobbin moves to the left, the pressing of the winding-side brake arm 6 is stopped, and the winding-side brake arm 6 and the supply-side brake arm 5 are pressed against the respective reel bases by the tension spring 9. Will do. Reference numeral 39 denotes a rod, which engages with the support shaft 40 and slides left and right. One end 39a of the rod is configured to press one end 38b of the bobbin of the self-holding solenoid 38, and the other end 39b is configured to press the supply side brake arm 5. In this configuration, when the rod moves to the left (hereinafter referred to as the first rod position),
The supply side brake arm 5 can be pressed by the part b to be separated from the supply side reel base. At this time, if the self-holding solenoid 38 is excited, the winding-side brake arm 6 is pressed against the winding-side reel base, and the supply-side brake arm 5 can be separated from the supply-side reel base. Next, when the rod moves to the center position (hereinafter referred to as the second rod position), the pressing of the supply side brake arm 5 at the portion 39b stops, and the both brake arms are excited by the excitation of the self-holding solenoid 38. Can be pressed against each reel base. Next, when the rod 39 moves to the right (hereinafter referred to as a third rod position), one end 38b of the bobbin of the self-holding solenoid 38 is pressed rightward at the portion 39a, and both brake arms are moved to the respective reels. Move away from the platform. As described above, even if the self-holding solenoid 38 is not excited even when the self-holding solenoid 38 is moved from this state to the second rod position, both brake arms maintain a state of being separated from each reel base. Reference numeral 41 denotes a rotation arm, which is rotatably locked around a support shaft 42, and has one end engaged with the rod 39 and a pin 43 at the other end. Reference numeral 44 denotes a second cam-equipped gear rotatably locked, which has a cam groove 45 and is engaged with the pin 43 of the rotating arm 41. Therefore, by rotating the second cam-equipped gear 44, the self-holding solenoid 38 and the supply brake arm 5 are operated via the rotating arm 41 and the rod 39.

5 to 7 show the state of the brake arm when the second cam gear 44 is rotated. FIG. 5 shows a state in which the supply-side brake arm 5 is separated from the supply-side reel base 3 and the take-up brake arm 6 is pressed against the take-up reel base 4 at the first rod position. FIG. 6 shows a state in which the self-holding solenoid 38 is excited at the second rod position and both brake arms are pressed against the respective reel bases. FIG. 7 shows a state where both brake arms are separated from the respective reel bases at the third rod position.

In FIG. 3, a drive gear 46 is interposed between the first cam gear 30 and the second cam gear 44 and meshes with both cam gears, and is connected to a motor (not shown). . Reference numeral 47 denotes a third cam gear, and one gear meshes with the second cam gear 44. Reference numeral 48 denotes a pinch roller arm, which is configured to engage with the third cam gear 47 and press the pinch roller 16 against the capstan rotation shaft 15 according to a cam formed on the third cam gear.

Fig. 8 shows the third gear 47 with cam and pinch roller arm
The figure shows the relationship with 48. In FIG. 8, a cam 47a formed on the third gear 47 with a cam and a projection 16a formed on a member engaged with the pinch roller arm 48 come into pressure contact with each other.
The pinch roller arm 48 rotates around the support shaft according to the cam shape of 7a, and is pressed against a capstan rotation shaft (not shown).

FIG. 4 shows the timing of the operation of the brake arm and the operation of the pinch roller between the first mode and the second mode in the above tape loading mechanism. This will be described with reference to FIG. The first configuration is the second rod position, and in the first configuration, when both brake arms are in pressure contact with the respective reel bases, the opposite direction to the second configuration before the transition to the second configuration. First, both brake arms are separated from the respective reel bases via the third rod position. When passing only through the third rod position, if only the brake releasing operation is performed as a whole, the magnetic tape does not move. After that, the first mode is shifted to the second mode. When shifting, only the supply side brake arm is separated from the supply side reel base as the first rod position, and the magnetic tape is pulled out from the supply side reel. Before reaching the second mode, the pinch roller completes the pressure contact with the stopped capstan rotating shaft, and then passes through the third rod position, and both brake arms are separated from each reel base to the second mode. To reach.
Therefore, when shifting from the first mode to the second mode, the take-up reel does not rotate, and the position of the magnetic tape at the control head does not shift. Also, when shifting from the second mode to the first mode, winding is performed by passing through the first rod position after passing through the third rod position, and thereafter separating the pinch roller from the capstan rotation shaft in the stopped state. The magnetic tape is wound on the supply reel without rotating the side reel. Therefore, also in this case, the magnetic tape cannot be removed by the control head.

In the second embodiment, the use of the self-holding solenoid can reduce the required power consumption as compared with the first embodiment. In this embodiment, the self-holding solenoid is engaged only with the take-up brake arm, and the supply-side brake arm is rotated by a part of the take-up brake arm. You may make it engage with both an arm and a supply side brake arm.

Effects of the Invention As described above, according to the present invention, the magnetic tape is prevented from moving with the control head between the first mode for performing fast-forward and rewind of the magnetic tape and the second mode for performing recording and reproduction, The magnetic tape can always be kept at the same position even when moving between the first mode and the second mode. Therefore, even if the second mode is returned to the second mode via the first mode from the second mode, the rotary drum comes into contact with the magnetic tape at the same position, and the screen does not move. In addition, since the position of the magnetic tape at the control head does not move, high-precision editing work can be performed using a control signal recorded on the magnetic tape. Also, by using a unidirectional self-holding solenoid for the operation of the brake,
An excellent effect that high-accuracy editing can be performed with low power consumption can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a tape loading mechanism of a magnetic recording and reproducing apparatus according to a first embodiment of the present invention, and FIG. 2 is a brake arm operation and a pinch roller operation of the magnetic recording and reproducing apparatus according to the first embodiment of the present invention. FIG. 3 is a plan view of the tape loading mechanism of the second embodiment of the present invention, FIG. 4 is a timing diagram of the tape loading of the second embodiment of the present invention, and FIG. FIG. 6 is a plan view showing a first rod position of the second embodiment, FIG. 6 is a plan view showing a second rod position of the second embodiment of the present invention, and FIG. 7 is a second embodiment of the present invention. FIG. 8 is a plan view showing the position of a third rod of the example, FIG. 8 is a diagram showing the relationship between a third gear with a cam and a pinch roller arm of the second embodiment of the present invention, and FIG. 9 is a conventional magnetic recording / reproducing apparatus. Plan view showing a first embodiment of the tape loading mechanism of the tenth,
FIG. 1 is a plan view showing a second embodiment of a tape loading mechanism of a conventional magnetic recording / reproducing apparatus. FIG. 11 is a first explanatory view showing a conventional tape loading mechanism. FIG. 12 shows a conventional tape loading mechanism. FIG. 13 is a timing chart of a brake arm operation and a pinch roller operation of a conventional magnetic recording / reproducing apparatus. 1 cassette 2, magnetic tape 3, supply reel stand 4, take-up reel stand 5, supply brake arm 6, take-up brake arm 7, 8, Support shaft, 9 ... Tension spring, 10 ... Electromagnetic solenoid, 11 ...
Slot: 12, Loading base, 13: Tape post, 14: Post stopper, 15: Capstan rotating shaft, 16: Pinch roller, 17: Gear, 18: Support shaft, 19
…… arm, 20 …… arm, 21 …… pin, 22 …… gear,
23, 24… Arm, 25… Pin, 26… Gear, 72… Sector gear, 28… Support shaft, 29… Pin, 30… First gear with cam, 31… Support shaft, 32 ... cam groove, 33 ... control head, 34 ... electromagnetic solenoid, 35 ... compression spring, 36 ... electromagnetic solenoid, 37 ... compression spring, 38 ... self-holding solenoid, 39 ... rod, 40 …… support shaft, 41…
... Rotating arm, 42 ... Support shaft, 43 ... Pin, 44 ... Gear with second cam, 45 ... Cam groove, 46 ... Driving gear, 47 ...
Third gear with cam, 48… Pinch roller arm, 49…
... a rotating drum.

Claims (2)

(57) [Claims] 1. A supply-side reel base and a take-up reel base that transmit rotational force to a pair of reels in a cassette around which a magnetic tape is wound, and a supply-side brake arm that presses against each of the reel bases to perform a braking operation. And a take-up side brake arm,
The magnetic tape in the cassette is pulled out and wound around a rotating drum to form a predetermined tape path; a control head and a capstan located on a tape path on the winding side of the tape post; A pinch roller for driving the magnetic tape by pressing against the stun, wherein the tape post forms a position where the magnetic tape is pulled out halfway and forms a second form which forms a predetermined tape path and a position where the first form is formed. The pinch roller is pressed against the stopped capstan before the take-up brake arm separates from the take-up reel base when moving from the first form to the second form. Winding is completed before the pinch roller separates from the stopped capstan when the operation is completed and the second mode is shifted to the first mode. Tape loading mechanism of a magnetic recording and reproducing apparatus, characterized in that the brake arm is configured to complete pressed against the take-up side reel base. 2. A solenoid that engages with one or both brake arms, realizes a braking operation of both brake arms at the time of excitation, and releases both brakes by being pressed to a self-holding position. A self-holding solenoid that holds the operation, and a member that performs an operation of pressing the self-holding solenoid to the self-holding position and an operation of engaging with the supply side brake arm and separating only the supply side brake arm from the supply side reel base. 2. A tape loading mechanism for a magnetic recording / reproducing apparatus according to claim 1, wherein said tape loading mechanism is provided.