JPH02158946A - Take-up device for tape-shaped recording medium - Google Patents

Abstract

PURPOSE:To prevent the tape damage at the time of the end of winding and to take up the tape at high speed by driving a motor so that the target tape speed outputted from an integrating circuit and the tape speed outputted from a tape speed detecting means are equal to each other. CONSTITUTION:A rotational speed detector 4 detects the rotational speed of a supply reel 1a, and a comparator 6 compares the rotational speed of the reel 1a and the rotational speed indicated by an upper limit rotational speed generating circuit 5 with each other. In accordance with the result of the circuit 6, an integration circuit 7 sets target tape speed data to lower speed and outputs it when the rotational speed of the reel 1a is higher than that indicated by the circuit 5, but the circuit 7 sets target tape speed data to higher speed and outputs it when the rotational speed of the reel 1a is lower. A driving circuit 8 drives a motor 2 so that the output of the circuit 7 and the detected speed output of a tape speed detector 3 coincide with each other, thereby following up the target tape speed. Thus, the tape damage due to sudden stop at the time of the end of winding is prevented and the tape is taken-up at the high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a digital audio tape recorder (DAT).
The present invention relates to a tape-shaped recording medium winding device that winds up a tape-shaped recording medium (referred to as a tape), such as a video tape recorder (referred to as a VTR) or a video tape recorder (referred to as a VTR).

BACKGROUND OF THE INVENTION In conventional cassette tape recorders and VTRs, when the end of the tape is reached during fast forwarding or rewinding, the end of the tape is either left in that state or the tape is suddenly stopped using a deceleration means. For this reason, it is necessary to set a low winding speed and to provide a device to protect the tape so that the tape does not suffer damage such as abnormal tension, abrasion, or material deterioration even if the tape is entered or suddenly stopped. (For example, the magnetic recording and reproducing device disclosed in Japanese Patent Application Laid-Open No. 54-5409) Problems to be Solved by the Invention However, in such conventional methods, considering sudden stop at the end of winding, it is difficult to protect the tape. Unless a device is used, tapes cannot be wound at such high speeds that tape damage occurs; for example, DAT has the problem that high-speed winding is not possible even though the format allows for high-speed searching. Ta.

The present invention solves the above problems, and by controlling the tape speed using information on the rotation speed of the supply reel, winding can be performed at a higher speed than before without causing damage to the tape due to a sudden stop at the end of winding. It is an object of the present invention to provide a tape-shaped recording medium winding device that enables the following.

Means for Solving the Problems To achieve this object, the tape-shaped recording medium winding device of the present invention is a device that mutually winds the same tape wound on two reels, A motor, a tape speed detection means for detecting the running speed of the tape, a rotation speed detector for detecting the rotation speed of the supply reel, and an upper limit rotation speed data of the supply reel in the same output format as the rotation speed detector. an upper limit rotational speed generation circuit to output, a comparison circuit that compares and outputs the magnitude of the rotational speed indicated by the output of the upper limit rotational speed generation circuit and the output of the rotational speed detector, and an integration process upon receiving the output of the comparison circuit. and a drive circuit that drives the motor so that the tape running speed detected by the tape speed detecting means is equal to the tape running speed determined by the integrating circuit, The tape is wound up without the rotational speed of the supply reel exceeding a specified speed.

Effect of the present invention With the above-described configuration, the rotational speed detector detects the rotational speed of the supply reel, and the comparison circuit compares the magnitude of the rotational speed indicated by the output of the rotational speed detector and the output of the upper limit rotational speed generation circuit. and output the result. The integrating circuit receives the output of the comparator circuit, changes and outputs the target tape speed so that the rotational speed of the supply side reel becomes the value indicated by the upper limit rotational speed generation circuit. Since the drive circuit drives the motor so that the output of the tape speed detection means matches the target tape speed, the tape can be wound without the rotation speed of the supply reel exceeding the upper limit rotation speed.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a tape-shaped recording medium winding device in a first embodiment of the present invention.

In FIG. 1, 1 is a magnetic tape, la and lb are reels for winding up the magnetic tape 1, 2 is a motor that rotates the reel 1b on the winding side to wind up the magnetic tape 1, and 3 is a motor for rotating the magnetic tape 1. 4 is a rotation speed detector that outputs a value corresponding to the rotation speed of the supply side girdle 1a, and 5 is a rotation speed detector that detects the upper limit rotation speed data of the supply side girdle 1a. An upper limit rotational speed generating circuit 6 outputs in the same output format as the detector 4, and 6 compares the rotational speed detected by the rotational speed detector 4 with the rotational speed indicated by the upper limit rotational speed generating circuit 5. 7 is an integration circuit that receives the output of the comparison circuit 6 and changes the target tape speed data so that the rotation speed of the reel 1a becomes the value indicated by the upper limit rotation speed generation circuit 5. 8 is an integration circuit that outputs the target tape speed data. A drive circuit that compares the tape speed data that is the output of the tape speed detector 3 with the target tape speed data that is the output of the integrating circuit 7, and drives the motor 2 so that the tape speed data matches the target tape speed data. be.

The operation of the tape-shaped recording medium winding device of the first embodiment configured as described above will be described below.

Normally, the integrating circuit 7 outputs target tape speed data, and the driving circuit 8 drives the motor 2 so that the output of the tape speed detector 3 matches the output of the integrating circuit 7, so the tape running speed is the target tape speed. The value corresponds to the data. The rotation speed detector 4 detects the rotation speed of the feed side rail 1a, and the comparison circuit 6 detects the rotation speed of the feed side rail 1a.
The rotational speed of a is compared with the rotational speed indicated by the upper limit rotational speed generation circuit 5, and the result is output. In response to the results of the comparison by the comparator circuit 6, the integrating circuit 7 changes the target tape speed data in the lower speed direction if the rotational speed of the reel 1a is greater than the rotational speed indicated by the upper limit rotational speed generation circuit 5, and outputs the target tape speed data in the lower speed direction. If the rotational speed is smaller than the rotational speed indicated by the upper limit rotational speed generation circuit 5, the target tape speed data is changed to a higher speed direction and output. The drive circuit 8 drives the motor 2 so that the output of the tape speed detector 3 matches the output of the integrating circuit 7, and the tape speed follows the target tape speed indicated by the integrating circuit 7.

In other words, the running speed of the magnetic tape 1 is controlled so that the rotational speed of the reel 1a reaches the value indicated by the upper limit rotational speed generation circuit 5, and the tape speed is set so as not to damage the magnetic tape 1 just before the end of winding. be able to.

A second embodiment of the present invention will be described below.

FIG. 2 is a block diagram of a tape-shaped recording medium winding device in a second embodiment of the present invention.

In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. 3a and 3b output frequency signals proportional to the rotational speed of reels 1a and 1b on the supply side and take-up side, respectively.FGN3G is a period for calculating the sum of the periods of the output signals of FG3a and FG3b as a digital value as the tape running speed. Adder circuit, 30 is FG3a and FG
3b and a period adding circuit 3c; 4a is an FG that outputs a frequency signal proportional to the rotation speed of the reel 1a on the supply side; 4b is a tape speed detector that uses the period of the output signal of FG 4a as period data of the reel 1a; Period detection circuit that outputs a digital value, 40 is FG4a and period detection circuit 4b
A rotation speed detector 50 is a reel 1 on the supply side.
An upper limit rotational speed generation circuit 60 outputs the upper limit rotational speed of a as reference data in the output format of the period detection circuit 4b, and 60 is turned on when the output value of the period detection circuit 4b is less than the output value of the upper limit rotational speed generation circuit 50. , 7a is a maximum speed data generation circuit that outputs the maximum value of the tape running speed as a digital value as period sum data, and 7b is the output of the maximum speed data generation circuit 7a. A data preset signal generation circuit 17C that outputs a trigger signal for setting data is a clock generation circuit that outputs a clock signal, and 7d is a clock generation circuit 7 only when the output of the magnitude comparison circuit 60 is on.
7e is an AND circuit that outputs the generated clock signal as an AND signal, and 7e is a data preset signal generation circuit 7b.
70 is a presettable up counter that sets and outputs the output data of the maximum speed data generation circuit 7a by the trigger signal of the AND circuit 7d, and counts and outputs the set data in an increasing direction by the AND signal of the AND circuit 7d. A one-way integration circuit consisting of a data preset signal generation circuit 7b, a clock generation circuit 7c, an AND circuit 7d, and a presettable up counter 7e, 8a subtracts the output data of the presettable up counter 7e from the output data of the period addition circuit 3c. The subtraction circuit 8b outputs an output in the direction that the running speed of the magnetic tape 1 increases when the subtraction result of the subtraction circuit 8a is positive, and in the direction that the running speed of the magnetic tape 1 decreases when the subtraction result of the subtraction circuit 8a is negative. , a motor driver circuit that causes the motor 2 to generate torque proportional to the amount of error, and 80 is a drive circuit composed of a subtraction circuit 8a and a motor driver circuit 8b.

FIG. 3 is a timing diagram showing the operation of the second embodiment.

In FIG. 3, A is a data preset signal generation circuit 7.
b is the trigger signal outputted, B is the periodic data outputted by the periodic detection circuit 4b, BO is the reference data outputted by the upper limit rotational speed generation circuit 50, C is the comparison signal outputted by the magnitude comparison circuit 60, and D is the clock generator. 7c outputs the clock signal, E is the AND signal output from the AND circuit 7d, F is the target period sum data output from the presettable up counter 7e, FO is the period sum data output from the maximum speed data generation circuit 7a, and G is the period sum data output from the maximum speed data generation circuit 7a. The value of the running speed of magnetic tape 1, GO
is the running speed of the magnetic tape 1 corresponding to the output of the maximum speed data generation circuit 7a.

The operation of the tape-shaped recording medium winding device of the second embodiment configured as described above will be described below with reference to FIGS. 2 and 3.

First, at the start of winding the magnetic tape 1, the period sum data FO of the maximum speed data generation circuit 7a is set in the presettable up counter 7e at the output timing of the trigger signal A of the data preset signal generation circuit 7b (for example, at the rising edge of the trigger signal A). be done. The drive circuit 80 is the period addition circuit 3
The motor 2 is driven so that the output of C matches the output of the presettable up counter 7e, and the running speed of the magnetic tape 1 is set to the running speed G indicated by the maximum speed data generation circuit 7a.
It is kept at o. Thereafter, as the magnetic tape 1 is wound up, the rotational speed of the supply roll 1a increases. As the rotational speed of the reel 1a increases, the period detection circuit 4b
The period data B becomes equal to or less than the reference data BO of the upper limit rotational speed generation circuit 50, and the comparison signal C of the magnitude comparison circuit 60 changes from the OFF state to the ON state. Upon receiving the comparison signal C in the on state, the AND circuit 7d outputs the clock signal generated by the clock generation circuit 7C as the AND signal E, and the presettable up counter 7e outputs the AND signal E of the AND circuit 7d (for example, the AND signal E), the target period sum data F is counted in an increasing direction and output. Here, increasing the target period sum data F corresponds to decreasing the target tape speed. The drive circuit 80 drives the motor 2 so that the output of the period addition circuit 3c matches the target period sum data F of the presettable up counter 7e indicating the target tape speed.

Next, when the running speed of the magnetic tape 1 decreases due to an increase in the target period sum data F, the rotation speed of the reel 1a also decreases, and the period data B of the period detection circuit 4b becomes the reference data of the upper limit rotation speed generation circuit 50. It becomes larger than BO, and the comparison signal C of the magnitude comparison circuit 60 is turned off. When the comparison signal C turns off, the clock output of the AND circuit 7d is stopped, and the counting operation of the presettable up counter 7e is also stopped, and the running speed G of the magnetic tape 1 is stopped.
is kept constant. When the running speed G of the magnetic tape 1 is kept constant, the radius of the wheel 1a including the tape winding thickness gradually becomes smaller, and the period data B of the period detection circuit 4b becomes the reference for the upper limit rotational speed generation circuit 50. The data will be below BO,
The comparison signal C of the magnitude comparison circuit 60 changes from the off state to the on state again. Thereafter, the above-described operations are repeated.

That is, after setting the - degree target tape speed, the running speed of the magnetic tape 1 is controlled so that the rotational speed of the reel 1a does not exceed the upper limit value indicated by the reference data BO of the upper limit rotational speed generation circuit 50, and the running speed of the magnetic tape 1 is smoothly controlled. It is possible to change the tape running speed.

Here, changes in tape running speed in the second embodiment will be explained using FIG. 4.

FIG. 4 is a diagram showing the relationship between the radius of the supply reel including the tape winding thickness and the tape running speed in the second embodiment.

In Fig. 4, R is the radius of the reel 1a including the tape winding thickness, RO is the radius of the reel 1a when the winding end is reached (the hub radius of the reel 1a), and R1 is the tape winding when starting winding. The radius of the reel 1a including the thickness, ■ is the tape running speed, vO is the tape running speed at the end of winding, and vl is the tape running speed set when starting winding (corresponding to the output of the maximum speed data generation circuit 7a). V2 is the tape running speed at which the rotational speed of the reel 1a becomes the upper limit value at the start of winding.

First, the rotational speed N (rpS) of the reel 1a on the supply side, the tape running speed V (mm/s) and the radius R of the reel 1a (
mm), the following relationship holds true: N=V/(2XπXR). Furthermore, due to the operation explained in FIGS. 2 and 3, the rotational speed N of the reel 1a is increased to the specified upper limit value N.
Assuming that it is controlled so that it does not exceed max (rps), the magnetic tape 1 is wound up in the following relationship: (1)≦2×π×RxNmax (1). Furthermore, since the maximum tape running speed in FIG. 4 is vl, the following relationship holds true between the tape running speeds V and vl: V≦v1 (2). Here, V=2×πXRXNmax * 1141(3)
Assuming that V given by equation (3) lies on the straight line in FIG. 4, the range that satisfies equations (1) and (2) is shown by the shaded area in FIG.

In other words, if the tape running speed V is set to Vl at the start of winding, the tape running speed V remains vl and the reel 1a
The radius R becomes smaller, and when the relationship shown by the straight line is reached, the tape running speed V changes along the straight line until the winding end. Further, there is no limit to the tape running speed V1 set at the start of winding, and the effects of the present invention will not change even if the tape running speed V2 or higher is used. In Figure 3,
An example is shown in which the tape running speed V1 set at the start of winding is set smaller than the tape running speed V2.

As described above, according to the second embodiment, the tape running speed V is maintained at vl until the relationship shown by the straight line is reached, and the tape running speed VO at the end of winding of the magnetic tape 1 is By setting the speed at which the magnetic tape 1 is not damaged even if it enters the end, it becomes possible to wind the magnetic tape 1 at a higher speed than before, especially at the beginning of winding.

In addition, in the embodiment, a tape-shaped recording medium winding device using the magnetic tape 1 was shown, but even if the structure of the present invention is used for a tape-shaped recording medium winding device using light, etc., the invention will still be applicable. The effect remains the same.

In the second embodiment, the input or output signals of the tape speed detector 30, rotation speed detector 40, upper limit rotation speed generation circuit 50, magnitude comparison circuit 60, one-way integration circuit 70, and drive circuit 80 are converted into digital signals. However, even if a method using analog signals is used, the effects of the present invention will not change.

In addition, in the embodiment, FG3a and F
Although G4a is provided separately, it goes without saying that the effects of the present invention will not change even if one is shared.

In addition, in the embodiment, a tape that is wound in one direction,
Although an example of a recording medium winding device has been shown, winding in the opposite direction can be easily achieved by changing the reel on the side that detects the rotational speed and the reel on the side that drives, and the effects of the invention remain unchanged.

In addition, the specific example of the tape speed detection means is not limited to the embodiment, as other methods such as recording and reproducing using a fixed head may be considered.

In addition to the embodiments, specific examples of the rotation speed detector include FG
It is also possible to detect the rotational speed by detecting the frequency of 4a, and the present invention is not limited to the embodiment.

Furthermore, the period addition circuit 3c@period detection circuit 4b of the embodiment
The upper limit rotational speed generation circuits 5 and 50, the comparison circuit 6, the magnitude comparison circuit 60, the integration circuit 70, the one-way integration circuit 70, and the subtraction circuit 8a can be easily realized by microcomputer processing, and the effects of the invention remain unchanged.

Effects of the Invention As described above, the present invention provides a device for mutually winding the same tape wound on two reels, which includes a motor for winding the tape, a tape speed detection means for detecting the running speed of the tape, and a tape speed detection means for detecting the running speed of the tape. , a rotation speed detector that detects the rotation speed of the supply side reel, an upper limit rotation speed generation circuit that outputs upper limit rotation speed data of the supply reel in the same output format as the rotation speed detector, and the upper limit rotation speed generation circuit. a comparison circuit that compares and outputs the magnitude of the rotation speed indicated by the output of the circuit and the output of the rotation speed detector; an integration circuit that receives the output of the comparison circuit and performs integration processing and outputs a target tape speed; and the tape A drive circuit is provided for driving the motor so that the tape running speed detected by the speed detecting means is equal to the tape running speed determined by the integrating circuit, and the output of the upper limit rotational speed generating circuit is used to suddenly stop the motor when winding is completed. Alternatively, by setting the rotation speed to a level that does not damage the tape even if the tape enters, it is possible to wind the tape-shaped recording medium faster than before, especially at the beginning of winding, and when the tape speed is decelerated, it can be smoothly decelerated. becomes.

Therefore, there is no need to use a device for protecting the tape even at the end of the winding, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a tape-shaped recording medium winding device according to a first embodiment of the present invention, FIG. 2 is a block diagram of a tape-shaped recording medium winding device according to a second embodiment of the present invention, and FIG. The figure is a timing diagram showing the operation in the second embodiment of the invention, and FIG. 4 is a diagram showing the relationship between the radius of the supply reel and the tape running speed in the second embodiment of the invention. 2...Motor, 3...Tape speed detection means, 4
...Rotation speed detector, 5...Upper limit rotation speed generation circuit, 6...Comparison circuit, 7...Integrator circuit,
8... Drive circuit. Agent's name Patent attorney Shigetaka Awano Haka 1 famous sword - Tape yl fall attack 1:14 False Xun - Rotation! ! Buried and exited Raku η - One-way rotation 2 Field - 5m Circuit figure 2 beginning time passage view end

Claims (2)

[Claims] (1) A device that mutually winds the same tape wound on two reels, which includes a motor that winds the tape, tape speed detection means that detects the running speed of the tape, and a device that detects the rotational speed of the supply reel. a rotational speed detector for detection, an upper limit rotational speed generation circuit that outputs upper limit rotational speed data of the supply reel in the same output format as the rotational speed detector, and an output of the upper limit rotational speed generation circuit and the rotational speed detector. a comparator circuit that compares and outputs the magnitude of the rotational speed indicated by the output of the comparator; an integration circuit that receives the output of the comparator circuit and outputs a target tape speed that has been subjected to integration processing; and a tape running speed detected by the tape speed detecting means. and a drive circuit for driving the motor so that the speed is equal to the tape running speed determined by the integrating circuit, and the tape is wound so that the rotational speed of the supply reel does not exceed a specified speed. A tape-shaped recording medium winding device. (2) The comparison circuit consists of a magnitude comparison circuit that compares and outputs the magnitude relationship between the output of the upper limit rotational speed generation circuit and the output of the rotational speed detector, and the integrator circuit includes a supply side reel for which the output of the magnitude comparison circuit is greater than or equal to the upper limit. 2. The tape-shaped recording medium winding device according to claim 1, further comprising a one-way integrating circuit that performs an integral operation in one direction of increasing or decreasing if the signal indicates a speed.