JPS592973B2 - Tape travel reversing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape running/reversing device used in fixed head magnetic recording/reproducing devices, tape recorders, and the like.

2. Description of the Related Art Conventionally, there is a device shown in FIG. 1 as a tape running/reversing device for a fixed head magnetic recording/reproducing device.

That is, 5. The supply drum 2 and the winding drum 2' are connected to the support shafts 5, 5' with the capstan 1 for driving and running the tape in between.
The supply drum 2 and the take-up drum 2' are always pressed against the capstan 1 by the elastic bodies 6, 6', and the 10 tapes are It performs running reversal. In this example, when the capstan 1 rotates in the direction of arrow a during recording, the supply drum 2 and take-up drum 2 also rotate in the directions of arrows a' and a, respectively, and the tape 3 moves at a speed of 3 m. /s can be driven near. When the tape 3 is completely wound 15 toward the winding drum 7, the capstan 1 is rotated in the direction of arrow b in the opposite direction. Then, the supply drum 2 becomes a winding drum and becomes a supply drum, and each drum 2, 2' rotates in the directions of arrows b' and b'', respectively, and the drums 2 and 2' rotate in the directions of arrows b' and b'', respectively, and the drums 2 and 2' rotate in the directions of arrows b' and b'', respectively, and the drums 2 and 2' rotate in the directions of arrows b' and b'', respectively, and run in the opposite direction from the beginning. Then, by running the tape in two directions in the forward and reverse directions, television signals, etc., are directly recorded on the tape 3 using, for example, a multi-head.Also, as shown in FIG. There is a method in which the drum T (and drum 2"') F5 is used as a drive unit to run the tape. In this method, the tape 3 is transferred to the drum 2 as the drum T rotates in the direction of arrow A'.
The tape 3 is wound onto the drum T after passing between the tape guide 8 and the head 9. When the tape 3 is completely wound onto the drum 1, the drum 2'' rotates in the opposite direction and the tape 3 is wound onto the drum T.
The rotations of ``'' are B and B'. In the above two examples, a well-known flywheel or the like is installed in the tape drive unit (for example, the motor) to suppress tape running movement, uneven rotation of the tape drive unit, etc. If the rotating direction is changed, the inertia of the flywheel etc. causes a considerable delay in the start-up of the rotating part after the tape running direction is changed, and this can cause serious problems such as switching error when recording when the tape tape is running back and forth using a multi-head. arise.

Further, problems arise with the life of the motor in the drive unit, the expansion and contraction of the tape, etc. In order to alleviate and eliminate the above-mentioned problems, the present invention aims to provide a tape running and reversing device that eliminates the influence of the inertial force of the flywheel, increases the life of the motor, and suppresses expansion and contraction of the tape.

An embodiment of the present invention will be described below based on FIGS. 2 to 8.

3 and 4, a capstan 10 for rotating the drum 2 or the drum 7 via the tape 3 is rotatably provided. In this case, the rotation center 0 of the capstan 10 is located at the center of the line segment 1 connecting the centers of the drums 2 and 7 (11-12
), and the distance 13 between the center of the capstan 10 and the rotation center 0 is 11<13. Then, as shown in FIG. 3, when the rotation direction of the capstan 10 is made clockwise, the drum 2 is rotated counterclockwise by the pressure of the capstan 10, and the tape 3 wound around the drum 7 is wound. take. As the tape 3 is sequentially wound onto the drum 2, the capstan 10I rotates from reference numeral A to reference numeral B about the circular rotation center 0 as shown in FIG. Immediately before the tape 3 is completely wound from the drum 7 to the drum 2, the capstan 10 is rotated toward the drum 7 by a switch (not shown) or the like, and brought into contact with the drum 7 as shown by reference numeral C. At this time of contact, tape 3
The winding supply is performed by braking the drums 2 and 7 (not shown).
X. )but,
Since the capstan 10 always rotates clockwise, if the brakes of the drums 2 and 7 are released when the capstan 10 and the drum 7 come into contact, the drum 7 will rotate counterclockwise and the drum 7 will rotate counterclockwise. 2 rotates clockwise due to tape tension as the drum 7 winds up the tape 3. Then, just before the end of winding the tape 3 on the drum 7, the capstan 10 is rotated toward the drum 2 by a switch (not shown), etc., and the capstan 10 is attached to the drum 2.
make contact through. Such operations are repeated to cause the tape 3 to travel back and forth. Further, the tape speed is equal to the circumferential speed of the capstan 10 because the capstan 10 runs the tape in direct contact with the tape 3.
Regarding the tape tension when the tape 3 runs on the tape guide 8, the case in FIG. 3 will be explained. When the capstan 10 rotates the drum 2 via the tape 3, tape tension g1 is generated, Drum 2 due to inertia
When the contact part p of tape 3 and tape 3 slip slightly, G
A tape tension of 2 results. Appropriate tape tension is provided by these tensions g1 and G2. Next, a configuration for rotating the capstan 10 will be explained based on FIGS. 5, 7, and 8. In FIG. 5, reference numeral 10 is a capstan for driving the tape 1 attached to the rotating shaft of a motor 11, 30 is a flywheel, and the motor 11 is fixed to a screw 20 at the end of a first rotating lever 12. The base end of the first rotating lever 12 is rotatably supported by a support shaft 13 fixed to a chassis (not shown). Also, approximately in the center of the first rotating lever 12 is a long hole 14.
A pin 17 is formed in the elongated hole 14 and protrudes from one end of a second rotating lever 15 that rotates around a support shaft 16 fixed to a chassis (not shown). It is embedded. The other end of the second rotary lever 15 is rotatably connected via a pin 18 to a switching lever 19 for recording/reproduction, etc. Further, a spring 21 is stretched between the motor 11 and the support shaft 16, so that the motor 11 and the capstan 10 are elastically lifted upward. Next, the operation of the above configuration will be explained.

In FIG. 7, when the switching lever 19 is used for recording, for example,
When pulled in the direction of arrow c, the second rotating lever 15
It rotates clockwise around the support shaft 16. Then, the pin 17 provided at one end of the second rotating lever 15 rotates clockwise while sliding in the elongated hole 14 of the first rotating lever 12, supporting the first rotating lever 12. Centered around axis 13,
Rotate clockwise to move the capstan 10 toward the drum 2. In this case, the pin 17 is connected to the support shaft 13 of the first rotation lever 12 and the support shaft 1 of the second rotation lever 15.
When the capstan 10 is located on the left side of the line connecting the centers of the drums 6 and 6, the capstan 10 is pressed against the drum 2 via the tape 3 by the spring 21. Then, if the rotating shaft of the motor 11 is rotated in the direction of arrow D, the drum 2 and capstan 1
0 are in pressure contact with each other, the drum 2Gζ is rotated in the direction of arrow E by the capstan 10. And the eighth
As shown in the figure, the capstan 10 moves together with the first rotary lever 12 around the support shaft 13 of the first rotary lever 12 in accordance with the amount of three tape wraps on the drum 2 . Further, along with this, the second rotation lever 15 and the switching lever 19 also move slightly in the direction of arrow F. Although not shown below, just before the tape 3 is completely wound around the drum 2,
A timing switch (not shown) or the like is provided at the other end of the switching lever 19, and when the switching lever 19 is operated in the direction of arrow F using a solenoid or the like, the second rotating lever 15 rotates counterclockwise. , the first rotating lever 12 is also rotated counterclockwise via the pin 17, and the capstan 10 is pressed against the drum 7 by the tension of the spring 21. In this case, the rotation direction of the capstan 10 may be the same as the direction in which the tape 3 is wound around the drum 2, so there is no need to switch the rotation direction of the motor 11. Also, the tape tension is
For example, in FIG. 7, the tape winding force Ga of the drum 2 is
A stable tape tension is obtained due to the tape tension Gb caused by the slip at the contact surface between the drum 2 and the tape 3 wound around the drum 7 due to the inertia of the drum 7. Furthermore, in order to stop the running of the tape 3, when the capstan 10 is detached from the drums 2 and 7, an electromagnetic brake or the like is operated on the shafts of the drums 2 and 7, so that conventional motors, flywheels, capstans, etc. It can be stopped in a short time without receiving any inertia force. In order to reduce the inertia of the tape winding and supply drums 2 and 7, it is more effective to make the drums 2 and 7 thin by using a light metal such as aluminum as shown in FIG.

As described above, according to the tape running and reversing device of the present invention, firstly, there is no need to switch the rotational direction of the rotating shaft of the rotating motor of the capstan for driving and running the tape according to the tape running direction, and the motor rotating shaft This eliminates the burden that occurs when reversing the motor, extending the life of the motor.

The inertial force of the shaft, motor, flywheel, capstan, etc. does not affect tape running when it stops.
Tape running can be stopped in a short time. Furthermore, since the inertia of each tape winding drum is small, the rotation of the drum can be smoothly started in a short time after the capstan is pressed against the drum, and switching when tape running is reversed when recording and playing back television signals etc. using a multi-head etc. It is something that Ella First Class can suppress. In addition, the tape runs in direct pressure contact with the capstan, which is the tape running drive unit, so if the circumferential speed of the capstan is kept constant, the tape runs at a constant speed, causing wow, flutter, etc. Problems can also be avoided.

[Brief explanation of drawings]

1 and 2 are schematic plan views showing conventional examples, respectively. 3 to 8 show an embodiment of the present invention, FIG. 3 is a schematic plan view showing the tape before winding the third tape, FIG. 4 is a schematic plan view showing the tape during winding the third tape, and FIG. 6 is a sectional view showing an example of the supply and take-up drums 2 and 7, FIG. 7 is a schematic plan view of the operating mechanism of the capstan 10 before winding 3 tapes, and FIG. 8 is a tape FIG. 3 is a schematic plan view of the capstan 10 operating mechanism during three windings. 2,7...Rotating drum,
3... Tape, 10... Capstan, 11... Motor, 12... First rotating lever 13, 16... Rotating shaft, 14...
...Elongated hole, 15...Second rotating lever, 1
7...Pin, 19...Switching lever (capstan switching means), 21...Spring.

Claims (1)

[Claims] 1. In a tape running and reversing device that winds a tape wound around one of the first and second rotating drums on the other rotating drum and runs the tape in reverse, the first rotating drum and the second rotating drum The first rotating drum and the second rotating drum are brought into contact with each other through the wound tape, and the center of rotation is on a line connecting the centers of the first and second rotating drums, and the tips of the first and second rotating drums are brought into contact with each other through the wound tape. a first rotary lever that moves between the two, a capstan that abuts the tape wound on the tip of the first rotary lever; A tape running device is provided with a capstan switching means for bringing the capstan into contact with the other one of the first and second rotating drums, and the first or second rotating drum is driven by the capstan via the tape. Reversing device.