JPS63239645A - Fast forwarding and rewinding device - Google Patents

Abstract

PURPOSE:To shorten a fast forwarding and rewinding time by increasing a rotational speed when a difference between the rotational frequency of a feeding reel and that of a rewinding reel is within a prescribed range based on a detecting output from feeding side rotation detecting means and a detecting output from rewinding side rotational detecting means. CONSTITUTION:The titled device is provided with a control means increasing the rotational speed when the difference between the rotational frequency of the feeding reel 28 and that of the rewinding reel 18 is within the prescribed range based on the outputs from the feeding side rotation detecting means 27, 22, 26 and the outputs from the rewinding side rotation detecting means 17, 12, 16. When the difference between the rotational frequency of the feeding reel 28 and that of the rewinding reel 18 is entered into the prescribed range, the rotational frequency of a feeding motor 23 or a rewinding motor 13 is increased. The fast forwarding and rewinding speed can be increased by a tape having a small reel hub diameter and the speed can be kept as it is by a tape having a large hub diameter. Consequently, the fast forwarding and winding time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fast forward/rewind device for a video tape recorder or the like which is capable of shortening fast forward/rewind time.

[Conventional technology]

Figure @4 is a perspective view showing an example of a conventional fast-forward/rewind device. Fast forwarding will be explained using FIG. 4.

A magnetic tape 20 is placed between the take-up reel 18 and the supply reel 18.
is now running.

A transparent data tag 19 is connected to both ends of the magnetic tape 20.

The leader tape 19 on the supply side is configured to detect light emitted by a light emitting diode 250 as a light emitting means by receiving the light beam through the leader tape 19 with a transducer 24 as a light receiving means.

Similarly, the leader tape on the side of the first winding υ is also configured to detect that the light emitted from the light emitting diode 15 is received by the seventh autotranso star 14 through the leader chip f19.

The output of the 7-auto transaster 24 controls the controller 62 on the supply side and the controller 31 on the take-up side.

Further, the output of the phototransistor 14 controls the supply side controller 32 and the winding side controller 61.

The supply reel 28 is fitted into the supply reel stand 21 and
This supply reel stand 21 is rotated by a supply top and bottom 23. This supply motor 23 is connected to 1! via a starting switch 42 and a controller 32. A voltage from source 52 is applied. The negative pole of the power supply 52 is grounded.

The supply reel stand 21 is braked by a supply reel stand brake 92. The supply reel brake 92 is supplied with voltage from a power source 72 via the controller 62.

Further, the take-up reel 18 is fitted into the take-up reel stand 11, and this take-up reel stand 11 is connected to the take-up motor 13.
It is designed to be rotated by

The winding motor 13 includes a controller 31. Start switch 41
In addition, the negative terminal of the power source 51 is grounded so that the voltage of the power source 51 is applied through the power source 51.

In addition, the first take-up reel stand 11 is equipped with a take-up side slider stand brake 9.
1, braking is applied. A power source 71 is connected to the take-up side wheel table brake 91 via a controller 61.
voltage is applied.

Next, the operation will be explained. If the light emitting diode 250 is blocked by the magnetic tape 20 when the activation switch 41 is closed, the phototransistor 24 is off and the controller 3'1 is closed.

A power supply 51 is supplied to the winding motor 13, and the magnetic tape 2
0 is wound onto the take-up reel 18.

At the end of the magnetic tape 20, the light from the light emitting diode 25 passes through the leader tag 19, is received by the phototransistor 24, and when the phototransistor 24 is turned on, the controller 31 opens and the rotation of the 1-winding motor 13 is stopped. At the same time, the controller 62 is closed, the voltage of the power supply 72 is applied to the supply reel stand brake 92, the supply reel stand brake 92 is activated, and the supply reel stand 21 is braked.
Fast forwarding is completed. Since the same operation is performed for rewinding, the explanation will be omitted.

By the way, the I/g diameter of the reel varies depending on the tape length.
When the tape length is short, the I-g diameter is large, and when the tape length is long, the note diameter is small.

At the end of the fast-forwarding cycle, the diameter of the supply reel 28 becomes almost the same as the diameter of the supply reel 28, and most of the magnetic tape is wound on the first take-up reel 18.

If the diameter of the take-up reel 18 is the same, the supply reel stand 2
1, the load on the take-up reel table 11 is greater when the diameter is smaller.

At the end of the tape, the phototransistor 24 is turned on, the regulator 31 is opened, and even if the power supply to the first take-up motor 13 is stopped, the first take-up series 18 rotates due to inertia and the leader tape 19 is rotated. Wind it up.

In this case, the leader tape 19 to be wound once has a larger diameter. Therefore, the speed of fast forwarding and rewinding is set so that the leader tape 19 will not be cut by a tape with a large bald diameter.

[Problem that the invention seeks to solve]

Since the conventional fast forwarding 91 rewinding device is constructed as described above, tapes with small hub diameters have long tape lengths and require a long time for fast forwarding 91 rewinding.

However, there are problems in that the speed of fast forwarding 91 and rewinding is set so that there is a margin for pulling out the leader tape with a tape having a large diameter.

This invention was made to solve this problem. For tapes with a small reel diameter, the fast forward speed and rewind speed are increased, while for tapes with a large diameter the full speed remains the same. You can keep it and send it fast. It is an object of the present invention to provide a fast forward/zero rewinding device that enables shortening of rewinding time.

[Means for solving problems]

The fast forwarding 91 rewinding device according to the present invention increases the rotation speed when the difference in rotation speed between the supply reel and the take-up reel falls within a predetermined range based on the output of the supply side rotation detection means and the output of the take-up side rotation detection means. The system is equipped with a control means for controlling the speed.

[For production]

In this invention, when the difference between the number of rotations of the supply reel detected by the supply side rotation detection means and the number of rotations of the take-up reel detected by the take-up side rotation detection means falls within a predetermined range, the supply motor or the winding Increase the rotation speed of the motor.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fast forward/rewind device of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of one embodiment. In FIG. 1, parts that are the same as those in FIG. 4 are given the same reference numerals, and their explanations will be omitted, and the structure of the parts that are different from those in FIG. 4 will be mainly described.

In the embodiment of FIG. 1, lAg1 of the supply reel stand 21
A reflector 27 is provided on the surface, and a light emitting diode 22 as a light emitting means and a phototransistor 26 as a light receiving means are arranged opposite to the reflector 27.

One rotation of the light emitting diode 22 causes the reflector 27 to rotate 4 times.
One reflector 27 is a reflective surface so as to reflect twice.

It is applied separately to non-reflective surfaces. This reflector 27° light emitting diode 22. A supply-side rotation detector is configured with the phototransistor 26).

The output 120 of the phototransoster 26 is the control l! '1 devices 82 and 83.

Similarly, a reflector 1 is also placed on the outer peripheral surface of the 1-take-up reel stand 11.
7 is provided, and a light emitting diode 12 as a light emitting means and a 7 autotransnoster 16 as a light receiving means are arranged opposite to the reflector 17.

The reflector 17 is coated on a reflective surface and a non-reflective surface so that the light emitting diode 12 is reflected four times per rotation. Thus, one reflector 17, one light emitting diode 12, and one autotransnoster 16 constitute a supply side rotation detector.

The output 110 of the phototransoster 16 is sent to the control devices 82 and 83 described above.

An external reset signal 130 is input to both control devices 82 and 83.

The output 101 of the control device 82 is adapted to vary the voltage of the power supply 53. This power source 53 is of a variable voltage type in place of the power source 5 shown in FIG.

Similarly, the output 102 of the control device 83 is adapted to vary the voltage of the power supply 54. This power source 54 is of a variable voltage type in place of the power source 52 of FIG. 4.

The rest of the configuration of this diagram i1 is the same as that of FIG. 4. The internal configurations of the control devices 82 and 83 are the same, and FIG. 2 shows the detailed configuration of the control device 82 as a representative.

In FIG. 2, the output 110 of the phototransistor 16 shown in FIG. 1 is input to the T terminal of a frequency divider 201 (divided by 81).

The output 140 of this frequency divider 201 is a D-type flip 7°-70
clock input terminal CK of the switching 205 (hereinafter referred to as FF)
and frequency divider 202 (divided by 80), frequency divider 203 (divided by 45
It is applied to each reset input terminal R of the frequency division).

A reset input terminal R of the frequency divider 201 is grounded.

Further, the output 120 of the phototransoster 26 is output to the frequency divider 2.
The output 141 of the 1 frequency divider 202 is input to the T terminals of the FF 204 and the set input terminal S of the FF 204.
The output 142 of the 1 frequency divider 203 is input to FF'204
It is designed to be input to the reset input terminal R of.

The output 143 of this FF 204 is input to the data input 4D of the D-type FF 205. This D type F'F
The set input terminal S and reset input terminal R of 2O3 are both grounded, and the output of D type FF205 is 144tmD type F'F.
It is designed to be input to the clock input terminal CK of 206.

The data input end of the D-type FF 206 is connected to the power supply, the set input end S is grounded, and the reset input end R is configured to receive the output 130 of the 7-ototransoctor 16 shown in FIG. An output 101 is output from the output terminal Q of the D-type FF'206.

The voltage of the power supply 53 shown in FIG. 1 is made variable.

Next, the operation of this invention will be explained. 1 from the output of the winding side rotation detector and the output of the supply fi*111 rotation detector.
The difference in rotational speed between the take-up reel 18 and the supply reel 28 will be calculated as a ratio. This ratio is equal to the ratio of the reciprocals of the respective reel diameters of the take-up reel 18 and the supply reel 28.

By the way, the bald diameter of the reel is 2011EB and 60! Class B 2a. When a tape with a tape thickness of 20 μm and a tape length of 110 m is wound around each tape/S.

The tape diameter is approximately 56.61 when the bald diameter is 20a! B. When the bald diameter is 60 m, it is approximately 80.0 slV.

Therefore, the ratio of the reel diameters of the 1-winding creel 18 and the supply reel 28 is from 0.35 to 2
．． Reeds in the range of 83, 0.75 to 1 for hub diameter 60
．． It is in the range of 33.

Also, if the tape length is less than 110m, the hub diameter is 608B.
When the tape length is 110m or more, the hub diameter is 201m.
Use a 1B reel.

That is, with a bald diameter of 60101, the take-up reel 18
The ratio of the reel diameters of the supply reel 28 and the supply reel 28 is always in the range of 0.75 to 1.33.

The output 110 of the phototransistor 16 and the output 12 of the phototransistor 26 are input to the control device 82 of wZl.
0 frequency exceeds the range of 0.75 to 1.33, this first control device 82 detects this, and the power supply
Increase the voltage and increase the rotation speed.

If the hub diameter is 60sIl, take-up series 1 at the end of the tape.
8 is one rotation, the supply reel 28 is 1.33 rotations. Similarly, when the bald diameter is 20 mm, the supply reel 28 is 2.83 rotations for one rotation of the take-up reel 18.

Further, since the diameter of the supply reel stand 21 is constant.

The braking force by the controller 92 is constant. 7e)) The land star 24 turns on and detects the leader tape 19 at the end of the magnetic tape 20, the controller 31 opens and stops power supply to the 1-winding motor 13, and at the same time the controller 62 closes.
The supply reel stand brake 92 is activated, and the supply reel stand 21 is braked.

Even if the power supply to the take-up motor 13 is stopped, one take-up reel rotates with an inertial force of 18μ. When the take-up reel 18 is rotating with a certain inertia force, and the supply reel stand 21 rotates 0.5 times until the brake is applied and the tape stops, the length that the leader tape 19 is drawn out is 31 for the bald diameter 2011B.
,418. /SS diameter 011B is 94.2m, and 100 meters of Series Tede 19! Knee T-lever, bald diameter 6
For 0 parrot, tolerance is L8111B, /M 7” diameter 20m1
Then, it becomes 68.6 parrot.

Therefore, with a diameter of 20 mm, it is possible to increase the rotational speed of the winding reel 18 while maintaining the full margin for pulling out the leader tape 19 at the end of the tape, and it is possible to shorten the winding time of the magnetic tape.

During rewinding, the controller 32 and start switch 42 similarly cause the power supply 54 to supply power to the supply motor 23.

The voltage of the source 54 is controlled by the control device 83 of @2.

The function of this second control device 83 is that of the first control device 82.
The function is the same as that of Even if you rewind with this configuration,
The same effect as when fast forwarding can be obtained.

In the above explanation, the case where the difference in the number of revolutions of the reel is determined by frequency has been described, but it is also possible to determine by one period or the width of the nokuru. In any of these cases, the diameter of C1 can be detected without depending on the rotation speed. In other words, even if the rotational speed is increasing after fast forwarding or rewinding has started, or there is a foreign object in the tape running path, the rotational speed may fluctuate.

By determining the difference in the rotational speed of the reels on both sides, the bald diameter can be detected regardless of the rotational speed, and tapes with small diameters and long tape lengths can be fast-forwarded or rewound in a short time.

Next, the operation of the control device 82 shown in FIG. 2 will be described with reference to the waveform diagram shown in FIG. 3. The output 110 (FIG. 3(a)) of the 7-autotransoctor 16 is input to the T terminal of the frequency divider 201. The frequency divider 201 divides this signal by 81 and outputs an output 140 (FIG. 3(b)) which is at a high level for one period as the output iQ. This output 140 is divided into 1 frequency divider 2021 frequency divider 2
It is supplied to the reset input terminal R of 03, and the D type F
It is supplied to the clock input terminal CK of F205.

The frequency divider 202 is connected to the output 120 (
Figure 3 (C)) is divided by 80 and output 141 (
FIG. 3(d)) is output and supplied to the set input terminal S of F'F204.

The 91 branching unit 203 is the output 1 of the phototransistor 26.
20 is divided by 45 and output 142 (Fig. 3(e)
)) is output and supplied to the reset input terminal S of the FF 204.

Next, the output 143 (
3(f)) is supplied to the data input end of the D-type FF 205.

Output 144 output to the output terminal Q of this D-type FF 205
(FIG. 3) is supplied to the clock input terminal CK of the D-type FF 206.

The data input end of this D-type FF 206 is connected to the power supply line, and the input level is always fixed at high.

a to the reset input terminal R, 9S section reset signal 130 (
FIG. 3(i)) is provided.

D-type FF2 is connected to the clock input terminal CK of this D-type FF206.
When the output 144 of 05 is input, the output 101 (FIG. 3 Φ)) is output to the output terminal Q of the D-type FF 206. This output 101 controls the voltage of the power supply 53 in the b1gi diagram.

In this way, the difference in the rotational speed between the 1-winding reel 18 and the supply reel 28 is expressed as a ratio, and when the range ranges from 0.75 to 1.33, the output 101 (discrimination output) of the D-type FF 206 becomes Irreperu and Nashi are retained.

When the external reset signal 130 is input to the reset input terminal R, the output 101 of the held signal becomes low level. This row section reset signal 130 is transmitted when the chip is replaced.
This is a signal that is input when the power is turned on. The second control device 83 can also be implemented with a similar configuration.

The present invention described above can be applied not only to video recorders but also to general applications in which winding of a running body of a long object is carried out quickly and safely.

〔Effect of the invention〕

As described above, this invention detects the rotation speed when the difference in the rotation speed of the supply reel and the take-up reel falls within a predetermined range based on the detection output of the supply side rotation detection means and the detection output of the take-up side rotation detection means. Since it is made to rise, it is possible to shorten the tense of fast forwarding and rewinding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the fast forwarding and rewinding device of the present invention, FIG. 2 is a block diagram showing the detailed configuration of the control device in the fast forwarding and rewinding device of the above, and FIG. 3 is a control of the same as the above. FIG. 4 is a perspective view of a conventional fast-forward nine-rewind device. 11... Volume @ Shireru stand, 12, 15, 22゜25.
...Light emitting diode, 13... Winding simulator. 14.16, 24.26...Foottrannosta. 17.27... Reflector, 18... Supply reel, 19
...Leader tape, 20...Magnetic tape, 21...
- Supply reel stand, 23... Supply motor, 31, 32,
61°62...controller, 53...power supply, 81...10th control device, 82...second control device, 91...
Take-up reel stand brake, 92...supply reel stand brake. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] a supply reel stand, a take-up reel stand, a supply side rotation detection means, a take-up side rotation detection means, a drive means for the supply reel stand, a drive means for the take-up reel stand, and a drive means for the supply reel stand. a braking means, a braking means for the take-up reel stand, a supply-side end detection means for detecting the end of the supply side of the traveling body running between the supply reel and the take-up reel, and a winding-side end of the traveling body. a first controller that operates the supply-side braking means based on the detection output of the supply-side termination detection means; a second controller that stops the operation of the drive means of the reel stand; a third controller that operates the braking means of the take-up reel stand based on the detection output of the winding side end detection means; and a third controller that operates the braking means of the take-up reel stand; a fourth controller that stops the movement of the drive means of the supply reel stand based on the detection output of the end detection means; a first control device that increases the rotation speed of the driving means of the take-up reel stand when the difference in the rotation speed of the take-up reels falls within a predetermined range; a second control device that increases the rotation speed of the drive means for the supply reel stand when the difference in rotation speed between the supply reel and the take-up reel falls within a predetermined range according to the output of the detection means; Device.