JPH0522978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention involves pulling out a magnetic tape from a cassette with a built-in reel hub wound around the magnetic tape, running it along a rotating head drum installed outside the cassette, and transmitting a signal. The present invention relates to a magnetic recording and reproducing device such as a video tape recorder that records or reproduces images.

Conventional structure and its problems In recent years, magnetic recording and reproducing devices such as cassette video tape recorders have become smaller and lighter, and in order to simplify the machine, the magnetic tape is pulled out from the cassette and wound around a magnetic head. It is common to use independent drive sources for each of the means, the means for switching the operation between various modes in the tape running state, and the means for pressing the pinch roller against the capstan.

Hereinafter, the configuration of the conventional example will be explained using FIGS. 1 and 2. First, by attaching the cassette 1, the magnetic tape 5, which has been passed through the tape guide posts 2a, 2b, the inclined posts 3a, 3b, and the pinch roller 4, as shown by the two-dot chain lines in FIG.
inserted inside. Next, this installation of the cassette is detected by a switch (not shown), and the loading motor 6 rotates, transmitting rotation to the worm wheel 8 that meshes with the worm 7, and moving the loading ring 10 counterclockwise via the pinion gear 9. Rotate it. Further, the loading ring 11 is rotated clockwise by a two-stage gear 12 that meshes with the pinion gear 9. tape guide post 2
a. The base 13a for fixing the inclined post 3a is connected to the loading ring 11 by a rod 18a, and the base 13b for fixing the tape guide post 2b and the inclined post 3b is connected to the loading ring 10 by a rod 18b. has been done.
As a result, the preceding tape guide posts 2a, 2
At b, the tape 5 is gradually drawn out of the cassette 1. The pulled-out magnetic tape 5 is then wound around the circumferential surface of the rotary head drum 14, and thereafter fixed at that position. Thereafter, when the mode is switched to recording or playback mode, the plunger 15 is activated and the pinch lever 16 equipped with the pinch roller 4 is activated.
By rotating the magnetic tape clockwise and pressing the pinch roller 4 against the capstan 17, the magnetic tape 5 is run at a constant speed to perform desired recording and reproduction. In the figure, 19 and 20 are pinch holders arranged between the plunger 15 and the pinch lever 16, 21 is a pinch pressure spring arranged between both holders 19 and 20, and 22 is a cassette 1.
The tape guides 23 and 24 provided on the cassette 1 are a supply reel and a take-up reel provided on the cassette 1 as well.

However, as mentioned above, there is a means for pulling out the magnetic tape from the cassette, winding it around the magnetic head and running it, a brake means (not shown) that applies braking to the reel in various modes while the tape is running, and a pinch roller that is crimped to the capstan. Using an independent drive source for each operating means allows for some degree of miniaturization by simplifying the mechanism, but there is a limit to further miniaturization, and using an independent drive source for each operating means Therefore, it was inevitable that the cost would be high and the weight would be heavy. In addition, in a magnetic recording/reproducing apparatus in which each of the above-mentioned means is operated by a single driving source, a mechanism for switching each operating means occupies a large space, which is a big handicap in reducing the size of the apparatus.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object thereof is to provide a magnetic recording/reproducing device that has a simple configuration, is small in size, lightweight, and enables cost reduction.

Structure of the Invention In order to achieve the above object, the magnetic recording/reproducing apparatus of the present invention pulls out the magnetic tape from a cassette containing a reel wound with the magnetic tape to the outside of the cassette, and attaches the magnetic tape to a magnetic head installed outside the cassette. A magnetic recording and reproducing device configured to record or reproduce a signal by traveling along the substrate, the device being rotatable about a first axis provided on a substrate and slidable in the direction of the first axis. a first gear having a tooth trace formed on a cylinder while drawing a spiral curve, and a spur gear portion formed coaxially; a first gear meshing with the first gear and provided on the substrate; a second gear rotatable around the second axis;
a third gear that transmits a driving force to the spur gear portion of the first gear; a drive means that drives the third gear; and a drive unit that is driven by movement of the first gear in the first axial direction. a tape loading means driven by the rotation of the second gear and for pulling out the magnetic tape from the cassette to a state where it can be run while being attached to the magnetic head; a first blocking means for blocking the first gear from sliding in the first axial direction; and after the magnetic tape is pulled out from the cassette to a state where it can run by attaching it to a magnetic head installed outside the cassette; It has a release means for releasing the prevention of the first gear from sliding in the first axial direction by the first prevention means, and a second prevention means for preventing rotation of the second gear. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings (FIGS. 3 to 10).

First, the tape loading means will be explained. The cassette 31 is horizontally mounted and positioned on a plurality of positioning pins 33 provided on a substrate 32 such as a chassis. Incidentally, by mounting this cassette, the front cover (not shown) of the cassette 31 is opened. With this cassette installed, cassette 3
The magnetic tape 34 in 1 is passed as shown by the two-dot chain line in FIG. Also, by installing this cassette,
A supply reel 35 and a take-up reel 36 in the cassette 31 are engaged with a supply reel stand 37 and a take-up reel stand 38 disposed on the substrate 32, respectively. On the other hand, the rotating head drum 39 is connected to the mounted cassette 31.
The magnetic tape exiting the rotary head drum 39 is tilted by the lead angle so that it will advance perpendicularly to the substrate 32 and horizontally when tape loading is completed, and the loading ring 40 is located approximately at the center of the front of the rotary head drum 39. The internal gear 41, which is arranged at an eccentric position and fixed on the base plate 32, is arranged at a position concentric with the loading ring 40. Reference numeral 42 denotes an internal gear formed concentrically with the internal gear 41 and disposed on the base plate 32 so as to be able to slide in the circumferential direction, and is always pulled in one direction by a spring 43. A main base 45 having two tape guide posts 44a and 44b for guiding the magnetic tape 34 is disposed above the loading ring 40 (see FIG. 6), and is connected to the loading ring via a connecting rod 46. A hook 47 connected to the rotary head drum 40 and formed on the main base 45 is movably engaged with a loading guide 48 formed along the lead of the rotary head drum 39. A sub-base 50 having a tape guide post 44c and an inclined post 49 is arranged between the loading ring 40 and the internal gear 41, and concentric gears with different numbers of teeth are rotatably attached to the lower part of the sub-base 50. A gear with a small number of teeth meshes with the loading ring 40, and a gear with a large number of teeth meshes with the internal gear 41. The loading ring 40 is rotatable about a shaft 53 via a pinion gear 52 and meshes with a gear 54 having a worm gear portion and a spur gear portion formed concentrically. A gear 55 having a worm part and a spur gear part formed coaxially with the worm part meshes with the gear 54 and is rotatable about a shaft 57 fixed to a gear holder 56 provided on the substrate 32. and the shaft 5
It is attached so that it can slide in the axial direction of 7. 58 and 59 are tape guide posts 44d
and 44e, 60 is an erase head, and 61 is a V stopper for fixing the sub-base 50 when tape loading is completed. 62 is a cam gear that meshes with the spur gear portion of the gear 54 via the pinion gear 52 and a relay gear 63; 64 is a cam that has a rack portion that meshes with the gear portion of the guide post arm 59 and corresponds to the cam of the cam gear 62; This is a guide post drawer rod having a follower pin 65, and is configured so that when the gear 54 rotates in tape loading mode, the cam gear 62 rotates, and as a result, the guide post arm 59 rotates clockwise and stops. ing.

Next, the operation switching means for switching the operation mode of the device will be explained. A worm holder 66 is slidable using the shaft 57 as a guide, and is connected to an L-shaped lever 68 disposed on the base plate 32 so as to be rotatable about the pivot shaft 67 . 69 is the main rod, supply reel soft brake 7
0. The tension regulator has a cam portion that switches the take-up reel soft brake 71 and the main brake 72 according to each operation mode, and applies a predetermined tension to the magnetic tape 34 during recording and reproduction in a desired mode. It has a cam part that releases. 7
3 is a pinch lever that has a pinch roller 74 and is rotatable about a pivot shaft 75. 76 is a pinch pressure spring.

Next, the driving means for driving the gear 55 will be explained. Reference numeral 77 denotes a reduction gear formed coaxially with gears having different numbers of teeth, and meshes with the spur gear portion of the gear 55. 78 is a pulley in which a gear part and a pulley part are coaxially formed, and meshes with the reduction gear 77, and the belt 79
The motor pulley 81 of the loading motor 80 is interlocked with the motor pulley 81 of the loading motor 80 via.

Next, a blocking means for blocking the gear 55 from sliding in the axial direction will be explained. 82 is a detent arm that has a detent roller 83 and is arranged so as to be able to rotate coaxially with the pinion gear, and when the device is in tape loading mode, movement of the worm holder 66 is prevented by the detent roller 83. are doing.

Next, a releasing means for releasing the blocking of the blocking means from sliding the gear 55 in the axial direction;
The blocking means for blocking the rotation of the gear 54 will be explained. 84 is rotatable around a pivot shaft 85, has a detent roller 86 that rotates in contact with the inside of the loading ring 40, and is always provided with a clockwise rotational force by a detent spring 87. This is the day tent arm provided.
Further, the pivot shaft 88 of the detent roller 86 corresponds to the slit portion 82a of the detent arm 82, and as shown in FIG. 10, tape loading is started and the loading ring 40 completes tape loading. When the loading ring 40 is rotated to the position shown in FIG.
The detent roller 86 enters, the loading ring 40 is fixed, and as a result, the pinion gear 52 and gear 54 are also fixed. Further, the detent arm 82 that interlocks with the detent arm 84 rotates counterclockwise, and the worm holder 66 becomes movable.

Next, the tension regulator section will be explained. Reference numeral 89 is a tension arm rotatably arranged around a pivot shaft 90, and reference numeral 91 is a tension post that comes into contact with the magnetic tape 34 and detects tape tension when the tape is running. A tension band 92 is wound around the supply reel base 37 and is used to apply a constant tape tension to the magnetic tape 34 during tape running. A sector gear 93 is rotatably arranged around a pivot shaft 94, has a gear that meshes with a gear portion of the tension arm 89, and has cam pins 95a and 95b corresponding to the cam portion of the main rod 69. Both ends of the tension band 92 are rotatably mounted at different distances from the rotation support shaft 94, and the brake torque applied by the tension band 92 during recording and playback is greater than the brake torque applied to the tension band 92 during reverse playback. Therefore, the brake torque applied is reduced. Conventionally, one end of the tension band 92 is fixed on the substrate 32, and if reverse playback is performed in this state, the supply reel stand 37 cannot be rotated due to the tension band 92 biting into the supply reel stand 37, and the magnetic tape 34 It was necessary to forcibly release the tension band 92 during reverse playback. Therefore, there was a problem that a mode different from the recording/reproducing mode had to be provided, but by adopting the configuration shown in this embodiment, even if the supply reel stand 37 is rotated counterclockwise during reverse reproduction, the tension band can be maintained. It is possible to prevent the occurrence of biting with 92,
There is an advantage that there is no need to provide a reverse playback mode in the device as in the conventional case.

The operation of the magnetic recording/reproducing apparatus of this embodiment configured as described above will be described below. First, the tape loading operation will be explained.
Since the cassette 31 is installed, the preceding tape guide posts 44a to 44f, the inclined post 49, the tension post 91, and the pinch roller 74 are inserted inside the magnetic tape 34 that has passed as shown in FIG. . Next, the installation of the cassette is detected by the switch, and the loading motor 80 shown in FIGS. 7 and 8 rotates in the forward direction, and the pulley 7
8. The speed is reduced by the reduction gear 77, and the gear 55
Rotation is transmitted to. At this time, the gear 55 is prevented from moving in the direction of the shaft 57 by the detent arm 82. Therefore, the rotation of the gear 55 is transmitted to the gear 54, and the loading ring 40 is rotated clockwise via the pinion gear 52. As a result, the preceding tape guide post 44
The magnetic tape 34 is hooked at point a, and is gradually drawn out of the cassette 31 as the tape guide post 44a moves. The pulled-out magnetic tape 34 is then gradually wound around the circumferential surface of the rotary head drum 39 in a clockwise direction. On the other hand, loading ring 40
In synchronization with the clockwise rotation of the loading ring 40, the tape guide post 44c and the inclined post 49, which are arranged on the sub-base 50, are moved clockwise by the planetary gear 51 and the internal gear 41 at a slower speed than the loading ring 40. When the tape guide post 44a reaches the position shown in FIG. 4, the tape guide post 44c also reaches the position shown in FIG. Fixed by The tape guide post 44c is fixed by a V stopper 61. Thereafter, the rotation of the loading ring 40 is transmitted to the internal gear 42 via the planetary gear 51, which stretches the spring 43, thereby providing a force for fixing the tape guide post 44c. Further, the tape guide post 44d is the same as the tape guide post 44.
When c approaches the position shown in FIG. 4, the lever portion 58a of the guide post arm 58 comes into contact with the head of the tape guide post 44c, and the tape guide post 44c is fixed to the V stopper portion 61, thereby closing the guide post. Arm 58 rotates counterclockwise and is fixed at a predetermined position. Regarding the tape guide post 44e, the rotation of the gear 54 causes the cam gear 62 to rotate, and the cam of the cam gear 62 moves the guide post drawer rod 64, thereby causing the guide post arm 59 to move counterclockwise. It rotates and stops at the same time as the tape guide post 44c is fixed and is fixed at that position.
When the loading ring 40 rotates to the position where the springs 43 and 96 sufficiently press each tape guide post, the detent roller 86 moves the loading ring 40 as shown in FIG.
into the cam groove 40a of the loading ring 40.
rotation is stopped and the loading ring 40 is locked at that position. At this time, as described above, the detent roller 83 is released from blocking the worm holder 66 from sliding. Therefore, due to the screw effect, the gears 54 and 55
Gear 55 begins to slide, and as a result, main rod 69 moves to the right and tension arm 8
9 is moved to the position shown in FIG.
Brake 7. At this time, the switch detects that loading is complete and the loading motor 8
0's rotation is stopped and loading is completed.

Next, the pinch roller crimping operation will be explained. When the loading motor 80 is further rotated in the forward direction from the loading completion state, the gear 55 moves further as shown in FIG. Crimp the capstan 97.
Further, the fast forward and rewind modes are set between the loading completion mode and the pinch crimp mode by sliding the gear 55.

In addition, 44g and 44h in the figure are tape guide posts,
98 is a reel motor, and 99 is an idler.

As described above, according to this embodiment, the gear 5
By adopting the drive mechanism according to 4,55,
With a simple configuration, a tape loading operation and a switching operation for switching the operating mode of the apparatus are realized with a single drive source.

Effects of the Invention As described above, according to the present invention, the device can be simplified;
An excellent effect of reducing size and weight can be obtained. Also the first
Due to the sliding movement of the gears, the switching speed of the operating mode of the device is rapid and smooth. This effect allows the braking timing of the main brake to be performed at a sufficiently high speed without complicating the mechanism. Furthermore, by employing a drive mechanism using the first and second gears, it is possible to realize the tape loading operation and the switching operation for switching the operation mode of the apparatus with a single drive source with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional magnetic recording/reproducing device, FIG. 2 is a side view of main parts of a conventional magnetic recording/reproducing device, FIGS. 3 to 10 show an embodiment of the present invention, and FIG.
5 to 5 are plan views of the magnetic recording/reproducing device, FIG. 6 is an enlarged perspective view of the main parts, FIGS. 7 and 8 are front and side views of the drive unit, and FIGS. 9 and 10 are It is a top view of a blocking means and a release means. 31...cassette, 32...substrate, 34...magnetic tape, 35...supply reel, 36...take-up reel, 39
...Rotating head drum, 40...Loading ring, 41, 42...Internal gear, 43...Spring, 4
4a to 44h...Tape guide post, 45...Main base, 46...Connection rod, 47...Hook, 4
8... Loading guide, 49... Inclined post, 5
0... Sub base, 51... Planet gear, 52... Pinion gear, 53... Shaft, 54, 55... Gear, 56... Gear holder, 57... Shaft, 58, 59... Guide post arm, 60... Erase head, 61... V stopper , 62...cam gear, 63... relay gear, 64
...Guide post drawer rod, 65...Cam follower pin, 66...Worm holder, 68...L-shaped lever, 69...Main rod, 70...Supply reel soft brake, 71...Take-up reel soft brake, 72...Main brake, 73... Pinch lever, 74...pinch roller, 76...pinch pressure spring, 77...reduction gear, 78...pulley, 79
...Belt, 80...Loading motor, 81...
Motor pulley, 82...Day tent arm, 83
...Detent roller, 84...Detent arm, 86...Detent roller, 87...Detent spring, 89...Tension arm, 91...
Tension post, 92...Tension band, 9
3... Sector gear, 95a, 95b... Cam pin,
96...Crimp spring, 97...Capstan.

Claims (1)

[Claims] 1. A magnetic recording/reproducing device configured to record or reproduce signals by pulling the magnetic tape out of a cassette containing a reel wound with magnetic tape and running it along a magnetic head installed outside the cassette. The device is rotatable about a first axis provided on a substrate and is arranged to be slidable in the direction of the first axis, and has a tooth trace formed on a cylinder while drawing a spiral curve. a first gear having a spur gear portion formed coaxially; a second gear meshing with the first gear and rotatable about a second shaft provided on the substrate; a third gear that transmits a driving force to the spur gear portion of the gear; a driving means that drives the third gear; and a third gear that is driven by the movement of the first gear in the first axial direction. an operation switching means for switching an operation mode; a tape loading means that is driven by the rotation of the second gear and pulls out the magnetic tape from the cassette to a state in which it can be run while being attached to the magnetic head; a first blocking means for blocking the gear from sliding in the first axial direction;
After the magnetic tape is pulled out from the cassette to a state where it can be run by attaching it to a magnetic head installed outside the cassette, the first blocking means
A magnetic recording and reproducing device comprising: a release means for releasing the prevention of the gear from sliding in the first axial direction; and a second prevention means for preventing the rotation of the second gear.