JPH0378144A - Controller for taking up tape - Google Patents

Abstract

PURPOSE:To eliminate the need of a tension sensing mechanism on a take-up side by controlling a take-up reel motor so that the reference value and the measured value of the variation of the rotating speed of the take-up reel in a specified time may be made equal. CONSTITUTION:The tension sensing mechanism 18 is provided only on the side where a magnetic tape 1 is taken up in a reverse direction, for example, in tape traveling. When the tape 1 is taken up in a forward direction, the necessary take-up torque of the reel motor 17 on the take-up side is obtained based on a tape supply quantity to the reel 14 on the take-up side in the specified time which is calculated from a tape traveling speed and the radium of the reel 14 at that time and it is taken as the reference value. Meanwhile, based on the variation of the rotating speed of the take-up reel motor 17 in the specified time and the radium of the reel 14 at that time, the take-up torque(measured value) of the reel motor on the take-up side at that time is obtained. Then, the reel motor 17 is controlled so that the reference value and the measured value of the take-up torque of the reel motor 17 may be made equal. Thus, a tape traveling path is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape winding retort control device for a VTR or the like.

[Conventional technology]

As described in Japanese Utility Model Publication No. 63-38428, the conventional device has a sensing mechanism for detecting the tape tension on the winding side in each of the forward and reverse directions of tape running.

[Problem to be solved by the invention]

The above conventional technology runs the tape in the forward direction.

In addition, with respect to the reverse direction, a tension sensing mechanism on the winding side is provided near the winding reel. In this case, as the tape is wound onto the reel, the diameter of the tape changes, but the tension sensing mechanism must form a tape running path so that it is not affected by this. To do this, the number of tape guides must be changed. However, there are disadvantages in that the tape running path becomes complicated.

An object of the present invention is to simplify a tape running path, and an object of the present invention is to provide a tape winding control device suitable for realizing this purpose.

[Means to solve the problem]

In order to achieve the above object, a tension sensing mechanism is provided only on the tape winding side in the reverse direction of tape running, and when winding the tape in the forward direction,
The required winding torque of the take-up reel motor is determined based on the amount of tape supplied to the take-up reel within a predetermined time calculated from the tape running speed and the radius of the take-up reel at that time, and is used as a reference value. On the other hand, the winding torque of the winding reel motor at that time (
Obtain actual measured value). The take-up reel motor is controlled so that the reference value of the take-up torque of the take-up reel motor described above is equal to the actually measured value of the take-up torque of the take-up reel motor.

[Effect]

In the above method, if the tape running speed is a predetermined value, the change in the radius of the take-up reel, that is, the change in the rotation speed of the take-up reel, can be calculated from the amount of winding on the take-up reel within a predetermined time. Ra nine. This is the reference value. If this reference value is controlled to be equal to the actual measured value of the rotational speed change of the take-up reel motor within a predetermined time, it is possible to generate a predetermined take-up torque according to the radius of the take-up reel. can.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a block diagram of the present invention, FIG. 2 is a schematic diagram of a VTR tape running system, and FIG. 3 is a tape running speed constant.
Frequency generator (hereinafter abbreviated as T-reel) of the pick-up reel (hereinafter abbreviated as T-reel) when winding the tape in the forward direction (arrow C direction) or reverse direction (arrow direction)
Hereinafter, FG (Fre/'uency Generat
or), abbreviated as), output frequency of ) and T of T reel radius
FIG. 4 is a diagram showing the address and data of the second storage means 26 in FIG. 1, and FIG. 5 is a specific circuit diagram. , 6th
The figure shows data in the ROM 51.

In Fig. 2, 1 is a magnetic tape, 2 is a rotating cylinder,
3 is the pinch roller, 4 is the capstan.

5 is a control head, 6 and 7 are guide posts.

8.9 is a guide roller, and 10 is a supply side tension pin (hereinafter abbreviated as S side tension pin).

11 is a spring, 12 is a supply side tension sensor (hereinafter abbreviated as S side tension sensor), and 13 is a supply side reel (hereinafter abbreviated as S reel).

14 is a pick-up side reel (hereinafter abbreviated as T reel)
), 15 is a tape cassette, 16 is an S reel motor, 1
7 is a T reel motor, 18 is an FG sensor for detecting the rotation speed of the T reel motor, 19 is an S reel motor drive circuit, 2
0 is a T-reel motor drive circuit, 21 is a winding torque control circuit, 22 is a tape tension control circuit, 23 is a system controller, and 24a and 24b are magnetic heads.

The S reel 16 and the T reel 17 are independently and directly rotated by reel motors 19 and 20, each of which is a DC motor. Each guide roller 8, 9 and guide post 6,7. It is guided by the control head 5. Here, in play mode.

Pinch roller 3 is pressed against capstan 4, capstan 4 is rotationally driven in the direction of arrow E, and magnetic tape 1 is run in the direction of arrow C. At this time, the capstan 4 is rotated at a constant rotational speed, so that the magnetic tape 1 is
The vehicle is driven at a constant speed in the same direction.

Next, the magnetic tape 1 is sent out by the capstan 4.
A method for winding the T-reel 14 by rotating it in the direction of arrow A will be described in detail. Figure 3(a) shows the time changes in the output frequency of the T-reel FG and the T-reel winding diameter when the magnetic tape 1 fed out at a constant speed is wound onto the T-reel 14.
, (b), the winding diameter of the T reel 14 is T from the minimum value.
It shows temporal changes in the output frequency of reel FG and the T-reel winding diameter. That is, once the T-reel winding diameter at the start of the playback mode is known, the T-reel motor 1 can be adjusted thereafter so that the frequency of the T-reel FG changes as shown in FIG. 3(a).
It is sufficient to control the winding torque of step 7.

Also, the tape tension is determined by a spring 11 in the tape running path.
An S-side tension pin 10 energized by is provided, and the position of the S-side tension pin 10 applied to the magnetic tape 1 is detected by an S-side tension sensor 12. This sensor 12 is usually an angle sensor composed of a potentiometer or the like. That is, this S-side tension pin 10 balances the biasing spring force and tape tension at a predetermined position, and detects the tape tension. This S side tension sensor 1
2 is input to the tape tension control circuit 22, and the output is fed back to the S reel motor 16.
Due to the torque generated by this S reel motor 16 (generated in direction B in the figure).

The back tension applied to the magnetic tape 1 is controlled.

In addition, in the reverse playback mode, the pinch roller 3.

As in the reproduction mode, it is pressed against the capstan 4, the capstan 4 is driven to rotate in the direction of arrow F, and the magnetic tape 1 is run in the direction of arrow F. At this time as well, the capstan 4 is rotated at a constant rotational speed as in the above-described reproduction mode, so that the magnetic tape 1 is run at a constant running speed in the direction of the arrow. At this time, the magnetic tape 1 fed out by the capstan 4 is wound up by rotating the S reel 13 in the direction of arrow B. This is done by controlling the S side tension in the same manner as the pack tension control in the playback mode described above. The output of the sensor 12 is input to the tape tension control circuit 22, and the output is fed back to the S reel motor 16 to control the torque generated by this S reel motor (B in the figure).
occurs in the direction. ) controls the winding retention when winding the magnetic tape 1.

On the other hand, the pack tension of the magnetic tape 1 is controlled by the T-reel motor 17. This is because when the amount of tape wound on the T-reel 14 is large, the inertia of the T-reel 14 becomes large. (This is because the winding diameter of the T-reel 14 is large.) At this time, if the reverse playback mode is stopped, the inertia of the T-reel 14 is large, so the magnetic tape 1 will be sent out due to its inertia. When the amount of tape being loaded is small, if the same torque is generated as when the amount of tape is large, the pack tension applied to the magnetic tape 1 will increase, and the capstan 4 will cause the magnetic tape 1 to
It becomes impossible to send out.

Therefore, the pack tension torque (generated in the direction A in the figure) of the T-reel motor 17 may be controlled while observing the frequency of the T-reel FG, as in the reproduction mode. That is, the pack tension torque of the T-reel motor 17 may be controlled in accordance with the frequency change of the T-reel FG as shown in FIG. 3(Q).

Furthermore, the winding diameter of the T-reel 14 at the start of the playback mode is such that the magnetic tape 1 reaches the tape running path during the playback mode by the movement of the guide rollers 8 and 9 from the position indicated by the dashed line G on the tape cassette 15. During this period (hereinafter referred to as tape loading period), the S reel 13 is fixed with a brake (not shown), and the amount of tape pulled out from the T reel 14 and the output pulse from the T reel FG sensor 18 generated during that period are measured. It can be determined by counting the number.

Next, the winding torque control circuit 21 described above with reference to FIG. 1 will be described in detail. FIG. 1 is a block diagram of the present invention, and the same parts and parts as in FIG. 2 are given the same reference numerals. 25 is a first storage means, 26 is a second storage means, 27 is a frequency dividing circuit, 28 is a T-reel FG measurement means, 29 is a clock generation circuit, 30 is a counter, 31 and 32 are latch circuits, 33
34.35 is a subtraction circuit, 36 is a comparison means, 37 is an addition means, 38 is a switching means, 39 is a DA converter (hereinafter abbreviated as DAC), 40 is a first address generation circuit, 41 42 is a T-reel FG input terminal, and 43 is a T-reel motor control output terminal.

T-reel FG input from T-reel FG input terminal 42
is divided by the frequency dividing circuit 27 according to the tape feeding speed of the capstan 4. Further, no frequency division is performed during the tape loading period. During this tape loading period, the output of the frequency dividing circuit 27 is counted by the counter 30. The count value data of the counter 30 is input as an address of the first storage means 25. As the data corresponding to the address of the first storage means 25, control output data of the 'l' IJ-le motor 17 in the reproduction mode and in the reverse reproduction mode is stored. Switching between the playback mode and the reverse playback mode is performed by the output of the system controller 23. At the start of the regeneration mode or the reverse regeneration mode, the switch of the switching means 38 is connected to the h side. Therefore, at the time of start, the digital output of the first storage means 25 is converted to an analog output by the DAC 39, and the output is output from the terminal 43.
Output to.

Next, after the reproduction mode (or reverse reproduction mode) is started, the switch of the switching means 38 is connected to the j side. The time change in the frequency of the T-reel FG is measured by the T-reel FG actual measurement means 28.

That is, the interval of one cycle of the signal output from the T-reel FG frequency dividing circuit 27 is measured using the output clock of the clock generation circuit 29. That is, measurement can be performed by inputting the output clock of the clock generation circuit 29 to the counter 3o and starting and stopping it using the output signal of the frequency divider 27. Here, the input signal of the counter 30 is switched between the tape loading period and when the tape is running. Next, the count output of the counter 30 is latched at predetermined time intervals. A pulse generation circuit 33 outputs a timing pulse. The T-reel FG cycle at predetermined time intervals is stored in the latch circuits 31 and 32 using the output pulses of the pulse generating circuit 33. Control may be performed so that the amount of change in the T reel FG at this predetermined time interval becomes a predetermined value. The amount of change in the T-reel FG to be compared here is based on the second waveform as shown in Fig. 4, where the time is the address and the T-reel FG frequency is the data.
The settings can be easily made using the storage means 26. The first address generation circuit 40 inputs the start address to the second storage means 26 using the address at the start of the reproduction mode (the address input to the first storage means 25) as an initial value, and holds the data. do. After a predetermined period of time, the second address generation circuit 41 obtains a second address, inputs this into the second storage means 26, and holds the data. By subtracting the data corresponding to the first address and the data corresponding to the second address by the subtraction circuit 35, a predetermined T-reel FG frequency change amount is obtained. On the other hand, by subtracting the T-reel FG actual measurement data (output data of the latch circuits 31 and 32) measured at the above-mentioned predetermined time intervals using the subtraction circuit 34, the actual T-reel FG cycle change amount (that is, the T-reel FG frequency change A predetermined T-reel FG frequency change amount of 0 or more to obtain the actual T-reel F
The comparison means 36 detects an error in the amount of change in the G frequency. The error output of the comparing means 36 and the T reel motor control output corresponding to the second address are added by the adding means 37, and the D
The TURLE motor control output is obtained by DA conversion with AC39. Here, the T-reel motor control output corresponding to the second address is obtained by inputting the output of the second address generation circuit 41 to the first storage means 25.

FIG. 5 is a specific circuit diagram of the present invention, and the same parts and equivalent parts as in FIG. 1 are given the same reference numerals. 51
．． 52 is a read-only memory (hereinafter abbreviated as ROM); 53 to 55 are latch circuits; 56 is a counter;
7.58 is a pulse forming circuit, and 59 is a frequency dividing circuit.

The ROM 51 corresponds to the first storage means in FIG. 1, and stores data (T-reel motor control output) as shown in FIG. 6.

This data indicates the torque generated by the T-reel motor 17 in order to keep the one-winding retain tension constant when winding the magnetic tape 1 in the forward direction. That is, the radius of the T-reel 14 is rt, the take-up retape tension is ft, and the torque generated by the T-reel motor 17 is T.
If T, then TT= r T X r T-(1) Therefore, in order to make fT = constant,
The torque TT generated by the T-reel 14 may be changed in proportion to the radius rT of the T-reel 14. The ROM 52 is the second
It corresponds to the storage means of.

During the tape loading period, the T-reel FG is counted by the counter 30. The count output of the counter 30 is supplied as an address to the ROM 51 via the switching means 38c. The output from the ROM 51 is set as the initial value of the T-reel motor control output (T-reel motor control output at the start of the playback mode), and at the same time, the count output of the counter 30 is set as the initial value of the counter 56. When the magnetic tape 1 starts running, the counter 56 counts the output clock of the clock generation circuit 29 and supplies it as address data to the ROM 52. Further, the output clock of the clock generation circuit 29 is supplied to the pulse forming circuit 57 to generate pulses at predetermined time intervals. Using the output pulse e of the pulse forming circuit 57, the latch circuit 53 latches the T reel FG frequency data corresponding to the first address. The latch circuit 54 latches with the pulse f. That is, the T reel FG corresponding to the first address
The frequency data is held in the latch circuit 54, and the corresponding T-reel FG frequency data is latched in the latch circuit 53 at the time (pulse e) corresponding to the second address.

If the output data of these two latch circuits 53 and 54 are subtracted by the subtraction circuit 35, a predetermined T-reel FG frequency change amount can be obtained. On the other hand, as explained in FIG. 1, the output data of the subtraction circuit 34 is
This is an actual measurement value of the amount of period change (that is, the amount of T-reel FG frequency change). When the magnetic tape 1 starts running, the switches a, b, and a of the switching means 38 are connected to the j side, and the predetermined T-reel FG frequency change amount from the comparison means 36 and the measured T-reel FG frequency change amount are compared. The error is calculated as the T reel motor control output (ROM5) corresponding to the second address.
1 output), T reel motor control output terminal 4
Output to 3.

At this time, in order to support the reverse playback mode, (
As shown in c) and (d), there is an effect that the counter 30.56 that supplies the address of the ROM 51, 52 can be operated as a down counter.

The pulse forming circuit 58 includes a counter 30 that counts the time of one cycle based on the output signal of the T-reel FG frequency dividing circuit 59.
Forms start and stop signals. Further, by varying the frequency dividing ratio of the frequency dividing circuit 59 by the system controller 23 depending on the tape running speed, there is an effect that the data in the ROMs 51 and 52 can be stored in only one type.

The above has described an embodiment in which the T-reel FGI period is measured using the output clock of the clock generation circuit 29, and the time difference with the T-reel FGI period after a predetermined time is detected as the amount of change in the T-reel FG. As another example, the number of T-reel FG pulses counted within a predetermined time is counted again after a predetermined time, and the difference between the counted numbers is used as the amount of change in the T-reel FG. The detection method will be explained using FIGS. 7 and 8.

FIG. 7 is a block diagram of another embodiment, and FIG. 8 is a storage means 7.
2.73 is a diagram showing stored data.

This is a block diagram of another embodiment of FIG. 7, in which the same parts and equivalent parts as in FIG. 1 are given the same reference numerals.

7o is a frequency dividing circuit, 71 is a counter, 72.73 is a storage means, 74 to 76 are latch circuits, 77 is a switching means, 78.
79 is a latch circuit, 80 is a clock generation circuit, 81 is a pulse forming circuit, 82 is a counter, and 83 is a storage means.

The frequency dividing circuit 70 changes the frequency dividing ratio according to the running speed of the magnetic tape 1. The running speed of the magnetic tape 1 is input from the system controller 23.

No frequency division is performed during the tape loading period described above.

During this tape loading period, the counter 71 counts the output of the IJ-le FG sensor 18 which is generated when the T-reel 14 rotates. The output data of the counter 71 is supplied to the storage means 72 as an address.

The T-reel motor control output corresponding to this address is read from the storage means 72 and latched into the latch circuit 74.

Next, until a predetermined time has elapsed after the magnetic tape 1 starts running, the switching means 77 is connected to the h side, and the latch output of the latch circuit 74 is output from the terminal 43 as the T reel motor control output. be done. The magnetic tape 1 starts running, and after a predetermined period of time has elapsed, the output of the latch circuit 74 is transferred to the latch circuit 75. Thereafter, the T-reel FG output within a predetermined time is input to the frequency dividing circuit 70, and the output of the frequency dividing circuit 70 is counted by the counter 71. The count output of the counter 71 is supplied as an address to the storage means 72, and data corresponding to the address is read out.

The output of the storage means 72 is latched into the latch circuit 74 at a predetermined timing by the output pulse of the pulse forming circuit 76. The outputs of the latch circuits 74 and 75 are subtracted by the subtraction circuit 34, and the actual measured value of the amount of change in the number of T-reel FG pulses, that is, the amount of change in the T-reel motor control output after a predetermined time has elapsed, is obtained as the output of the subtraction circuit 34.

On the other hand, the counter 82 receives as an initial value the number of T-reel FG pulses counted by the counter 71 during the tape loading period via the switching means 77b. The storage means 83 stores data on the number of T-reel FG pulses at that time, using the elapsed time as an address, as in FIG. 4 described above. After a predetermined period of time, the output of the storage means 83 is latched by the latch circuit 76. The T-reel motor control output at that time is obtained from the storage means 73 whose address is the latch data of the latch circuit 76. The output data of the storage means 73 is sequentially latched by the latch circuits 78 and 79 and inputted to the subtraction circuit 35.
The amount of change in reel motor control output can be obtained. The 3° outputs of the above subtracting circuits 34 and 35 are input to the comparing means 36, and the error is calculated. output) and output from the T reel motor control output terminal 43.

In this embodiment, since the number of T-reel FG pulses is directly used as address data, there is an effect that the address control circuit can be simplified.

In the present invention, the magnetic tape 1 fed by the capstan 4 can be wound up by the T reel 14 at a predetermined tape speed, and the feeding can be controlled. At this time, tension is generated during winding (or feeding) by setting the tape winding (or feeding) speed of the T reel 14 to be slightly higher (lower) than the tape speed determined by the capstan 4. be able to. Therefore, by slightly changing the tape speed setting for one winding (or feeding) from the tape speed determined by the capstan 4, it is possible to manage the tension during winding (or feeding).

【Effect of the invention〕

According to the present invention, if the tape running speed is a predetermined value, if the one-take-up reel motor is controlled so that the reference value and the actual measurement value of the amount of change in rotational speed of the take-up reel within a predetermined time are equal, A predetermined winding torque can be generated depending on the radius of the take-up reel. Therefore, it is possible to eliminate the need for a tension sensing mechanism on the winding side.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
A schematic diagram of the tape running system of R, FIG. 3 is a diagram showing the time change of the T-reel FG frequency and T-reel radius, FIG. 4 is a diagram showing the address and data of the storage means, and FIG. 5 is a diagram showing the present invention. FIG. 6 is a diagram showing data in the ROM, FIG. 7 is a block diagram of another embodiment of the present invention, and FIG. 8 is a diagram showing data stored in the storage means. 1... Magnetic tape, 3... Pinch roller, 4...
Capstan, 13...S reel, 14...T reel. 16...S reel motor, 17...T reel motor. 18...T reel FG sensor, 19...S reel motor separate movement circuit, 20...T reel motor drive circuit. 21... Winding torque control circuit, 25... First storage means, 26... Second storage means, 27... Frequency dividing circuit. 28...T reel FG actual measurement means, 29...Clock generation circuit, 30...Counter, 31, 32...Latch circuit, 33...Pulse generation circuit, 34.35 River subtraction circuit, 36. ... Comparison means, 37 ... Addition means, 38
. . . switching means, 39 . . . DA converter, 40 . . . first address generation circuit, 41 . . . second address generation circuit. 51.52...ROM, 53-55...Latch circuit. 56...Counter, 57, 58...Pulse forming circuit. Hayabusa l Drawing 2 Figure 38: Switching reference drawings r4 (7 dresses)

Claims (1)

[Claims] 1. A tape reel (13, 14) that is directly rotationally driven by a pair of reel motors (16, 17), a capstan (4) that rotates at a constant rotation speed, and the capstan (4). ) and a pinch roller (3) that presses the tape (1);
A system controller (23) that generates a signal to control stopping, a tension sensor installed in the running path of the tape (1), and (
12), a frequency generator sensor (18) provided on the tape reel (14), a tape tension control circuit (22) that receives the output signal of the tension sensor (12), and a frequency generator sensor (12); 18), a winding torque control circuit (21) which receives the control signal from the system controller (23), and the tape reel (13) which receives the output signal of the tape tension control circuit (22). a reel motor drive circuit (19) of the reel motor (16) that drives the reel motor (16), and a reel motor (17) that drives the tape reel (14), which receives the output signal of the winding torque control circuit (21). A tape winding control device comprising: a reel motor drive circuit (20); 2. The winding torque control circuit (21) connects the frequency generator sensor (18) and the system controller (
Frequency divider circuit (27) that receives the control signal from 23) as input
and a clock generation circuit (29) that receives the control signal from the system controller (23) and outputs a reference clock signal; an output signal of the clock generation circuit (29); and an output signal of the frequency division circuit (27). Counter (30) that inputs the output signal
, a latch circuit (31) that latches the output data of the counter (30), a latch circuit (32) that latches the output data of the latch circuit (31), and the two latch circuits (31, 32). A pulse generation circuit (3) generates a pulse that determines the latch timing of the
3), a subtraction circuit (34) that subtracts the output data of the two latch circuits (31, 32), the output data of the counter (30), and the output signal from the clock generation circuit (29). a first address generation circuit (40) that receives the output signal from the clock generation circuit (29); a second address generation circuit (41) that receives the output signal from the clock generation circuit (29); and the first and second address generation circuits. (40, 41) second storage means (
26), a subtraction circuit (35) for subtracting the output data of the storage means (26) corresponding to the output signals of the first and second address generation circuits (40, 41), and the two subtraction circuits (34).
, 35), and a first storage means that uses the output data of the counter (30) or the output data of the second address generation circuit (41) as an address signal. (25), the output of the first storage means (25), and the output of the system controller (23), and
a switching means (38) for determining whether or not to add the output of the first storage means (25) and the output of the first storage means (25);
3. The tape winding control according to claim 1, comprising: an adding means (37) for adding the outputs of the adding means (36); and a DA converter (39) for converting the output of the adding means (37) into a DA converter. Device. 3. The winding torque control circuit (21) is a frequency dividing circuit (2) which receives as input the frequency generator sensor (18) and a control signal from the system controller (23).
7) and a clock generation circuit (80) that outputs the reference clock signal.
), a pulse forming circuit (81) which receives the output of the clock generation circuit (80) and a control signal from the system controller (23), an output of the frequency dividing circuit (70), and a pulse forming circuit (81) that receives the output of the clock generation circuit (80) and the control signal from the system controller (23); A counter (71) that receives the output of the formation circuit (81) as an input, a storage means (72) that uses the output signal of the counter (71) as an address, and a latch circuit that latches the output data of the storage means (72). (74); a latch circuit (75) that latches the output data of the latch circuit (74); a subtraction circuit (34) that subtracts the output data of the two latch circuits (74, 75); A counter (8) receives the output of the circuit (81) and the output data of the counter (71) for a predetermined period.
2), a storage means (83) whose input address is the output data of the counter (82), a latch circuit (76) that latches the output data of the storage means (83), and a latch circuit (76) that A storage means (73) that uses output data as an input address; a latch circuit (78) that latches the output data of the storage means (73); and a latch circuit (79) that latches the output data of the latch circuit (78). , a subtraction circuit (35) for subtracting the output data of the two latch circuits (78, 79), a comparison means (36) for input, and a subtraction circuit (35) for subtracting the output data of the two latch circuits (78, 79); a switching means (77) for switching the output data of the above-mentioned switching means (77) and the above-mentioned comparison means (36); The tape winding control device according to claim 1, comprising: a DA converter (39) that performs DA conversion;