JPS5856250A - Take-up device of magnetic tape for magnetic sound recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a wind phenomenon, by providing a spring which energizes a tape in its take-up direction between a reel disk driving rotary wheel and a reel disk which turns in a body with a reel at the roll-out side of a device which reverses automatically with a single capstan. CONSTITUTION:A shaft 11 is planted on the bottom surface of a reproducing device which reverses automatically by the forward/backward revolutions of a single capstan. A roll-out reel 11a and a reel drive disk 11b which turns in a body with the reel 11a are rotatably attached with a play to the shaft 11. At the same time, a roll-out reel driving rorary wheel 11c is fitted with a play to the shaft with a close contact to the lower face of the disk 11b. A spring 22 is hooked between the wheel 11c and a projected part 20 of the disk 11b, and as a result both the disk 11b and the reel 11a are always energized clockwise. A pin 21a planted to the wheel 11c presses the part 20 and drives the desk 11b and reel 11a in the same direction. Thus the slackness of a tape 13 which is caused while the reel 11a is taking up the tape can be absorbed to prevent a wind phenomenon. This prevents the deterioration of the sound quality.

Description

Detailed Description of the Invention For example, Japanese Patent Publication No. 54-263A for performing sciauto reverse.
The present invention relates to an improved technique for an autoreverse device using the disclosed cassette.

When playing using the forward and reverse rotation of a single capstan,
Compared to the known means using two capstans, the auto-reverse device has a simpler configuration, fewer failures, is smaller, and has significant practical effects. However, due to problems with playback sound quality, it is currently not possible to put this into practice. The unresolved difficulty is the following: 6. When the magnetic tape is running in the normal direction, that is, to the left in Figure 1 (when the capstan 7 is rotating in the counterclockwise direction). K is the running of the magnetic tape by conventional means, so
There is no problem with that playback sound. However, capstan 7 reversed and reel 11. When a rotates clockwise to wind the magnetic tape, the following problem occurs. At this time, the magnetic tape is running with one right force, but the tension needs to be increased. When traveling to the left, the tension of the tape is 110 to 20 grams, but when traveling to the right, a tension of 30 to 60 grams is required. This is because as the tension increases, the slippage between the magnetic tapes wound around the tube becomes worse, and the magnetic tapes are wound smoothly but not tightly. This is generally called the window phenomenon.1 As the window is being wound, it may suddenly collapse due to slippage between the magnetic tapes.At this time, the drive by the reel may be disrupted. occurs, and therefore the running speed of the magnetic tape on the magnetic head surface suddenly changes 1
-1 Also, the magnetic tape is separated from the magnetic head surface. Therefore, this has the effect of causing a significant deterioration of the reproduced sound quality.

The device of the present invention is characterized in that a device is obtained that eliminates the above-mentioned drawbacks. Next, the details will be explained with reference to the embodiments shown in FIG. 1 and below.

In FIG. 1, a symbol 1 indicated by a chain line indicates a cassette placed on decking soil, and is displayed so that the inside can be seen through. Support shaft installed on the bottom of the main body 10.1.
1 includes a take-up reel 10a and a feed reel l.
la are loosely fitted to each other so as to be rotatable. reel 10a
, 1], and a each have a hub 14 provided inside the sumo wrestler's kit.
．． 15 are fitted, and the hubs 14.1.5 are each driven by the reel lo a % 1.1 a Vc. That is, when the reel 10a rotates counterclockwise, the hub 14 winds the magnetic tape, and when the reel 11a rotates clockwise, the hub 15 winds the magnetic tape. The magnetic tapes wound around 15 are shown as symbols 13a and 13b, respectively. The magnetic tape 13 is guided to the front of the cassette 1 by guide rollers 9a and 9b (1 provided in the cassette), and
It is pressed against the magnetic head 2 by a pad 2a. The pad 2a is fixed to the center of a leaf spring 2b whose both ends are fixed to supports 2c and 2d, and is pressed against the front surface of the magnetic head.

The magnetic head 2 is fixed to a magnetic head support stand, and when in playback mode, playback is performed close to the cassette IK, as shown in the figure, and when in non-playback mode such as stop, fast forward, rewind, etc., the 61 cassette 1 A device for separating the shaft 4. Levers 4 and i are respectively supported on a and J, and are in contact with arrows A and B in the force direction by a splinter (V) not shown. Lever 4
At the free end, a pinch roller 3 and an idler (made of rubber) 5 are attached to a support shaft 3a.

5a.

In the non-reproduction mode, the magnetic head support is spaced apart from the cassette 1, so the pinch roller 3 and idler 5 are spaced apart from the capstan 7 and rotating shaft 8, respectively. In the non-reproduction mode, especially in the stop mode, the cassette 1 is attached to the deck surface from the upper blade, and at this time, the capstan 7 is inserted into the hole on the left side of the cassette 1 and rotated. The shaft 8 is also inserted through the hole on the right side. A flywheel (not shown) is fixed to the lower end of the capstan 7, and the flywheel is generally driven by a capstan motor. During normal rotation, the reel 10a is also rotated in the same direction by well-known means to wind up the magnetic tape. Reel 1.0 a is the take-up reel, and reel 11 a id
1. The rotating shaft 8, which is called a 9-out reel, is supported by a bearing provided on the main body, and a small diameter flywheel 8a is fixed to the lower end of the rotating shaft 8. Although it has a capstan-like structure, there is no drive source, so magnetic tape ■
3, it cooperates with the idler 5 and becomes an impedance roller. This effect will be discussed later.

The magnetic tape 13 runs under pressure1. When the entire magnetic tape is wound around the hub 14, reproduction of one magnetic track is completed. At this time, by known means, an electrical or mechanical signal is obtained due to the arrival of the end of the magnetic tape. This signal activates an electronic or electrical switch to reverse the capstan motor. In synchronization with this, the drive of the reel 10a is stopped and the reel 1]-a is driven one time clockwise by a well-known idler system or means described later with reference to FIG. Therefore, the magnetic tape starts running to the right. At the same time, the output of the induction coil of the magnetic head 2 is switched to another magnetic track. This means may also be any known means. Therefore, an auto-reverse device is obtained in which reproduction of another magnetic track is started. The winding torque of reel 11a is
Compared to 0 a, approximately 2 to 3 times is required, and 120
Approximately 170 gram centimeters is required. The reason for this is that the resistance of the magnetic tape running system is large, ie, the winding torque and the rotation of the impedance roller 8a and the friction of the magnetic head 2 are additionally added.

In the above-described winding, the magnetic tapes wound around the hub 15 are wound tightly, so that some slippage occurs between the magnetic tapes. If this sliding is smooth, the magnetic tape will be spirally wound into one piece.

1- If the tension of the magnetic tape is large, the above-mentioned sliding will not be smooth. The reason for this is thought to be that the tension and the pressure between the magnetic tapes increases.

Due to the above phenomenon, gaps (indicated by symbols 12a and 112b) occur at unspecified positions in the wound magnetic tape. This is commonly referred to as the window phenomenon.

Since the above-mentioned condition is an unstable balance phenomenon, the gap (window) described above may collapse due to sudden slippage between the magnetic tapes. At this time, it is half-15.
- The tension of the magnetic tape 13 suddenly decreases as it is consumed to collapse the window. Therefore, the speed of the magnetic tape on the surface of the magnetic head 2 changes suddenly, or the magnetic tape flies above the surface of the magnetic head, resulting in significant deterioration of sound quality.

The device according to the invention relates to means for eliminating the above-mentioned drawbacks, and will be explained in detail with reference to FIG. In FIG. 2, parts with the same symbols as those in FIG. 1 are the same members, so a description thereof will be omitted.

A reel 10a and a reel drive rotor are either fixed to a support shaft 10 set on the bottom of the main body, or connected via a friction sliding mechanism using a well-known felt plate. The former case is when the reel stand driving rotary wheel is driven by an independent electric motor, and the latter case is when the reel stand driving rotary wheel is driven by a capstan motor.

A feed-out reel l is attached to the support shaft 11 \ installed on the bottom of the main body.
1a and a reel stand 11b integrally formed therewith are loosely fitted so as to be freely rotatable. Closely attached to the lower surface of the reel stand 11b, the payout reel drive rotating wheel 11C is connected to the spindle 1.
1 is loosely fitted. As shown in the figure, a spring 22 is hung between the protrusion 20 of the reel stand 11b and the reel drive rotating wheel 11c. Due to the action of the spring 22, the reel stand 11. b and reel 11a are always struck in the opening direction. +, 1 on dotted line 13
Reference numeral 3 denotes a wound magnetic tape indicated by the same symbol in FIG. 1, and a magnetic tape wound around the hub 15.

Support shaft 11. Reel 11 az Reel stand 11b
1. Each section of the reel drive rotating wheel 11C1 spring 22 is shown in FIG.

The symbol 24 in Fig. 3 is a part of the bottom of the main body, and the planting pin 21
a is a contact portion provided on the reel drive rotary wheel 11CK, and when the reel drive rotary wheel 11C rotates clockwise, the planting pin 21a contacts the protrusion 20. Suppress 20 with l- and reel stand 1.1b,' towards the same bra.
It is configured to rotate the J-rule 11a. If the magnetic tape 13 becomes loose for some reason, the reel stand 11b, IJ-
The lever 11a rotates clockwise and operates to rapidly tighten the loosened magnetic tape. At this time, the planting pin 21a and the protrusion 20 are temporarily separated, but immediately come into contact with each other again. The reason for this can be explained as follows.

The rotational torque due to the repulsive force of the spring 220 is set so that it does not have enough torque to overcome the frictional force of the magnetic tape caused by the magnetic head 2 and wind the magnetic tape to the right. If the magnetic tape 13 becomes loose after 2, the rotational torque is sufficient to absorb this loosening, so as mentioned above, there is an effect that the loosening of the magnetic tape can be quickly corrected.

When the magnetic tape 13 normally travels to the right, this is done by the planting pin 21a pressing the protrusion 20,
Further, this rotation speed is restricted to a constant speed by the reverse rotation speed of the capstan 7. Therefore, since a frictional connection using a well-known felt plate is provided in a part of the above-mentioned torque transmission system, as described above, the erecting pin 21 is temporarily
Even if a and the protrusion 20 are separated, the planting pin 21
a can come into contact with the protrusion 20;

Planting pin 21b planted on reel drive rotating wheel 11C
The protrusion 20 rotated in the opening direction comes into contact with the protrusion 20 when it reaches the position 20a, and prevents further rotation.

Next, referring to FIG. 2, a description will be given of means for driving the reel 10a or the reel 11a using the reel drive motor 16.

The electric motor 16 is fixed to the main body, and a plastic rotating wheel 1.6b is fixed to its rotating shaft 16a. Further, the rotating shaft 16a and the lever 18 are frictionally coupled, and the lever 18 is also rotatably supported on the rotating shaft 16a. A rubber rotating ring 1 is attached to the free end of the lever 18.
9 is supported by its rotating shaft 19aK. Further, the rotating ring 161) and the rotating ring 19 are pressed against a spring (not shown). That is, the rotating shaft 19a is biased in the force direction of arrow C by a spring.

When the capstan motor rotates forward and the capstan 7 is driven counterclockwise, the motor 16 is also driven counterclockwise by a forward/reverse switch (shared with the capstan motor). . Therefore lever 1
8 also rotates in the same direction, and when the rotating wheel 19 comes into pressure contact with the reel drive rotating wheel 10c, it drives it counterclockwise. Therefore, the magnetic tape is wound around the hub 14 via the reel 10a and the IJ-roll stand 10b, and is reproduced.

Since the rotating wheels 19 are in pressure contact with each other at a biting angle, power transmission is ensured. When all the reproduction of one magnetic track of the magnetic tape is completed 17, the above-mentioned forward/reverse changeover switch is switched by an end detection signal by a well-known means, and the capstan motor and the electric motor 16 are rotated in the reverse direction. Therefore, the capstan 7 is reversed and the magnetic tape 13 is fed out to the right. At the same time, the lever 18 rotates clockwise, and the rotary wheel 19 comes into pressure contact with the reel drive rotary wheel 11c, driving it clockwise at a biting angle. Therefore, the magnetic tape 13 is wound around the hub 15 and reproduction of other magnetic tracks is started.

The driving torque of the reel drive rotating wheel 11C at this time is set to a torque two to three times that of the reel drive rotating wheel 10c. During such reproduction, if the gaps 12a and 12b (shown in the second figure) collapse due to the window phenomenon described above, 1
The winding tension of the magnetic tape decreases over time, causing it to become loose.3 However, as mentioned above, the reel lla and the reel base 11b rotate clockwise due to the elastic force of the spring 22. Since the loosening of the magnetic tape 13 described above is eliminated, deterioration of sound quality can be prevented. Also, since such responsiveness is not infinitely fast, it is better to further utilize a sound roller. This is because when the magnetic tape 13 becomes loose, the tension of the magnetic tape on the magnetic and rad surfaces is temporarily maintained by the action of the flywheel 8a. Rotating wheel 16b119, reel drive rotating wheel 1. O.C., 11
The same purpose can be achieved by using all C as gears to transmit power. The electric motor 16 in FIG. 2 is removed, and the rotating shaft 16 is
The same purpose can be achieved even if the motor is supported by a shaft bearing provided on the main body V, a pulley is fixed to the rotating shaft 6a, and a belt is passed between the boot 9 and the pulley fixed to the capstan 7. can be achieved. In this case, it is necessary to provide a friction sliding mechanism via a felt plate as part of the torque transmission system for driving the reel from the capstan.

In FIG. 2, the same purpose can be achieved by inserting the capstan 7 into the hole on the right side of the cassette 1 (the insertion hole for the rotating shaft 8). Also, at this time, the rotating shaft 8 and the flywheel 8
The impedance roller a must be provided on the left side of the cassette 1, that is, at the position of the capstan 7. At this time, the reel 11a serves as a take-up reel, and the reel 10a serves as a pay-out reel.

As can be seen from the above description, the device of the present invention has the effect of retaining the advantages of an auto-reverse device using a single capstan and eliminating only its disadvantages.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the apparatus of the present invention, FIG. 2 is an explanatory diagram of the vicinity of the reel, and FIG. 3 is a sectional view of the feed reel. 1...Cassette, 2...Magnetic head, 2a...
・Para l-12b...Plate spring, 3...Pinch roller, 4.6-lever, 5...Idler, 9a
19b...Guide roller, 7...Capstan, 8...Rotating shaft, 8a...Flywheel, 10.11...Spin shaft, 10a, 11 a-reel, 10b+, 1lb-reel Stand, 14.15...
Hub, 12 a ” + 1.2 b Gap (window), 13 a, 1.3 b X1a-・Magnetic tape, 10C111C... Reel drive rotating wheel, 1
6...Electric motor, 16b, 19-rotating wheel,
20.20a...protrusion, 21a, 21. b... Planting pin, 18... Lever, 22... Spring, 24
...Part of the main body. Patent applicant Seko-gi ω1 Co., Ltd.

Claims (1)

[Claims] The device is rotatable on the spindle, which is comprised of a device that switches the reproduction of the upper and lower magnetic tracks of the magnetic head and a device that alternately drives the take-up reel or the feed-out reel in synchronization with the forward and reverse rotation of a single capstan. Loosely fitted feeding 1
- a reel driving rotary wheel, a chipping reel stand placed on top of the soil of the rotating wheel and loosely fitted to the support shaft, and a chipping reel integrated therewith;
A spring is hung between the feed reel stand and the feed reel drive rotary wheel to elastically repel the feed reel stand in the direction in which the magnetic tape is wound; The reel is driven to wind the magnetic tape, but when the capstan is reversed, the feed reel drive rotary wheel is driven in the direction of winding the magnetic tape, and the feed reel drive rotary wheel and the feed reel drive wheel are driven in the direction in which the magnetic tape is wound. By making contact with the output reel stand via the contact member, they rotate synchronously to wind the magnetic tape, and only when the tension of the magnetic tape becomes small due to a window phenomenon, etc., the action of the spring described above is activated. 1. A device for winding a magnetic tape for a magnetic recording/playback machine, comprising: a device for driving a feed reel stand to reduce changes in tension of the magnetic tape.