JPS63146260A - Fast-feeding/rewinding device - Google Patents

Abstract

PURPOSE:To shorten the fast-feeding/rewinding time by counting the drive control signal on a tape moving in a single revolution of a reel and setting a high-speed feed at no feed termination but a low-speed feed at the feed termination respectively. CONSTITUTION:When the reels 2 and 3 of the supply and take-up sides start revolutions by a take-up side reel drive means 9, the drive control signal count value NT set by the output of a take-up side drive control signal counting means 18 in a single revolution of the reel 2 is supplied to a high-speed control means 19 together with the drive control signal count value NS set by the output of a supply side drive control signal counting means 17 in a single revolution of the reel 3. The value LS of a magnetic tape wound round the reel 3 is obtained and the supply voltage is increased higher than a normal level when the value LS exceeds a prescribed level to obtain a high rewinding speed. When the value LS is reduced less than the prescribed level, the supply voltage is set at a normal level. Thus it is possible to increase the average feeding speed to shorten the fast feeding/rewinding time in a reasonable state of the tape termination.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fast forwarding and rewinding device which is applied to tape feeding in a machine and is configured to be able to feed a long object at high speed in the winding direction or the rewinding direction.

[Prior Art] Fig. 4 is a schematic diagram showing an example of the configuration of a conventional fast forwarding and rewinding device. Take reel stand (33
). (34) is the supply reel stand, (3)
is a supply reel, which is mated with the supply reel stand (34). (1) is magnetic tape, (28) is tape (1)
A transparent leader tape is attached to the end of the tape.

(30) is a light-emitting diode; (29) is a phototransistor, which is disposed on the opposite side of the magnetic tape (1) to face the light-emitting diode (30), and is located at the leader tape (28); Light emitted from the light emitting diode (30) passes through and is transferred to the phototransistor (2).
9) constitutes a supply side tape end detection means (4) which detects the tape end by receiving light. (9) is a take-up side motor which is a driving means of the take-up reel stand (33), and this take-up side motor (9) is connected to a start switch (13) and a first control switch which is a drive stop means. (II) to the power source (15).

The above configuration is a configuration for rewinding, and the following configuration is provided as a configuration for fast forwarding.

(10) is a motor that is a driving means for the supply reel stand (34). During fast forwarding, both the supply reel stand (34) and the motor (10) are on the winding side, and this motor (lO
) is connected to a power source (16) via a start switch (14) and a second control switch (12) serving as drive stop means.

(32) is a light emitting diode, and (31) is a phototransistor, which constitute winding-side tape end detection means (5) for detecting a leader tape (not shown) continuous to the starting end of the tape during fast forwarding. ing.

Next, the rewinding operation of the above configuration will be explained.

When the start switch (13) is closed, the light emitting diode (3)
If the light of 0) is blocked by the magnetic tape (1),
The first control switch (11) is closed and the power supply (15)
Power is supplied to the motor (9), which rotates the take-up reel (2) counterclockwise via the reel stand (33) to wind up the magnetic tape (1) on the reel (2). As this winding progresses and the state shown in Figure 4 is reached, the leader tape (2
The light from the light emitting diode (30) passes through point 8) and turns on the phototransistor (29), which opens the first control switch (II), which stops the rotation of the motor (9). Rewinding is complete.

For fast forward operation, a tape end detection means (4) consisting of a light emitting diode (5) and a phototransistor (31) is activated to detect the start end of the tape, and a second control switch (12) operates to detect the beginning of the tape. In addition to controlling
Since it operates in the same way as the above-mentioned rewind, detailed explanation will be omitted.

[Problem to be Solved by the Invention 1] In the conventional fast forward/rewind device configured as described above, in order to increase the tape feeding speed, doubling the voltage of the reel driving means such as a motor increases the reel rotational speed. It is possible to increase the speed and reduce the fast forward/rewind time by about half. However, if the tape feeding speed is increased, even if the reel drive means is stopped when the end of the tape is detected, the leader tape will wind up and stop due to the inertial rotation of the reel, so if the leader tape is short,
There is an inconvenience that the tape may be cut unexpectedly, and on the other hand, if the feed speed when fast forwarding and rewinding the tape is set to a speed that does not cause the tape to be cut at the end of the feed, there is a disadvantage that it takes a lot of time for fast forwarding and rewinding. there were.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a fast forward/rewind device that can speed up fast forward/rewind and also reliably prevent accidental cutting of the tape. .

[Means for Solving the Problems] The fast forward rewinding device according to the present invention includes a take-up reel drive means, a tape end detection means, and a drive stop control means for stopping the take-up reel drive means. In addition to the configuration for fast forwarding and rewinding, there is also a running amount g1 signal detection means for detecting and outputting a tape running control signal during fast forwarding and rewinding, and a winding side for detecting the rotation period of the first winding side reel and the supply side reel. Counting the output signals of the reel rotation detection means and the rotation detection means of the supply reel, and the traveling control signal detection means during one revolution of the take-up reel and the supply reel in synchronization with the outputs of these rotation detection means. a winding-side running control signal counting means and a supplying-side running control signal counting means for outputting a winding-side running control signal counting means; and a high-speed control means for outputting a high-speed control signal to the winding-side reel driving means using the output of these running control signal counting means as input. It is characterized by having the following.

[Function] According to the present invention, during fast forwarding and rewinding, the running control signals on the tape that move during one revolution of the supply reel and the take-up reel are counted, and the supply reel is adjusted based on each count value. The amount of tape to be wound at is determined, and if the tape is not at the end of feeding based on the determined value, a high-speed control signal is output to the take-up reel drive means to perform high-speed feeding, and when the end of feeding is reached based on the determined value, the above-mentioned By feeding at a slower speed than usual, it is possible to shorten the time for fast forwarding and rewinding, and at the same time, it is possible to prevent accidental cutting of the chip.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of a fast forward/rewind device according to an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 4 indicate the same configuration, and detailed explanation thereof will be omitted. do.

In FIG. 1, (6) is a travel control signal detection means which detects a travel control signal during fast forwarding and rewinding and outputs a signal C. (7) is a take-up reel rotation detecting means which outputs a signal RT every time the take-up reel (2) rotates once. (
8) is a supply side reel rotation detection means, which detects the rotation of the supply side reel (3).
) outputs a signal R3 every time it rotates once.

Reference numeral (18) is a take-up side travel control signal counting means, which is a travel control signal detection means for detecting a gap in which the take-up reel (2) rotates once based on the output signal RT of the take-up side reel rotation detection means (7). (6) The output signal C is counted and the counted value NT is output.

(17) is a supply side running control signal counting means, which is a running control signal detecting means (6) during one revolution of the supply side reel (3) based on the output signal R3 of the supply side reel rotation detection means (8). The output signal C of is counted, and the count value N
Output S.

(19) is a high-speed control means for increasing the rewinding speed, and a-removal side and supply side running control signal counting means (18)
and (17) use the respective output count value NT and count value NS as input to determine the recording speed and reel huff diameter of the magnetic tape (1), and further determine the recording speed and reel huff diameter of the supply side reel (3).
A power supply means (15) that calculates the amount of magnetic tape wound around the magnetic tape and supplies power to the motor (9), which is the winding reel drive means, if the calculated amount of magnetic tape is greater than a predetermined value. ). Reference numeral (20) is a high-speed control means for controlling the fast-forwarding speed in the forward-feeding state of this embodiment in contrast to the high-speed control means (19) in the rewinding state.

(21) is a determination means which inputs the output count value NS and count value NT of the supply side and winding side running control signal counting means (17) and (18), and records the recording speed VREC of the magnetic tape (1), and the reel hub diameter rh are determined and output.

(23) is a calculation means which calculates the recording speed VREC of the magnetic tape (1) which is the output of the discrimination means (21) and the reel hub diameter rh and the supply side running control signal counting means (17).
) is input to the supply side sole (
3) The amount of wrapped tape LS is calculated and the corresponding output is performed.

(27) is a power supply control means which uses the output of the calculation means (23) as an input and controls the high speed control means (19) to a high speed side when the amount of tape wound on the supply reel (3) is more than a predetermined value. do.

Next, the rewinding operation of the above configuration will be explained.

When the drive switch (13) is closed, if the supply side tape end detection means (5) does not detect the end of the magnetic tape, the drive stop control means (13) is closed and the winding is stopped from the power supply means (15). The motor serving as the take-up reel driving means (9) is energized to move the magnetic tape (1) onto the take-up reel (
2) Wind it up. At this point, the winding side reel drive means (
9), the supply side tape end detection means (5) detects the end of the magnetic tape and opens the drive stop control means (13). 1 to reel drive means (9)! When the power supply is stopped, the inertial rotation of the take-up reel (2) causes the magnetic tape (1) to stop in the middle of the leader tape (28) at the end, at a predetermined voltage that does not apply force to the end of the tape.

When the supply side and take-up side reels (2) and (3) start rotating by the take-up side reel drive means (9), the take-up side reel (2) is started by the output of the take-up side running control signal counting means (18). The running control signal count NT during one revolution of the supply side reel (3) and the running control signal count NS during one revolution of the supply side reel (3) are determined by the output of the supply side running control signal counting means (17). 19). The high speed control means (1
9) calculates the amount of magnetic tape wound on the supply reel (co) from the above-mentioned counter (figs NT), and outputs a power control signal if the amount of magnetic tape LS is greater than a predetermined value.

The power supply means (15) supplies a supply voltage higher than usual according to the power supply control signal which is the output of the high speed control means (19), thereby increasing the return speed.

Also, the amount of magnetic tape wound on the supply side reel (K) L
When S becomes less than a predetermined amount, at least the power supply means (
15) becomes the normal voltage, and then the supply side tape end detection means (5) detects the tape end and opens the drive stop control means (13), and the take-up side reel drive means (9) Rewinding is completed by stopping .

Furthermore, the operation of the high-speed control hand tt (19) and its surroundings will be briefly explained based on FIG.

First, during fast forwarding and rewinding, the travel control signal detection means (
6) As shown in FIG. 1, the means for recording and reproducing the travel control signal during recording and reproducing is made so that the magnetic tape (ri) is in contact with the means for recording and reproducing the travel control signal even in the fast forward/rewind state, and the travel control signal is transferred onto the magnetic tape (1) in the same manner as during playback. The signal C is output by detecting the signal C.

Next, the supply reel rotation detection means (8) includes a reflection plate in the rotation system of the supply reel (3) and a photodiode so as to output a signal R3 every time the supply reel (3) rotates once. Detects the rotation of the supply reel (3) and sends a signal R
Outputs 8. Similarly, the first take-up side reel rotation detection means (
7) outputs the signal RT while the take-up reel (2) makes one rotation. Subsequently, the supply side running control signal counting means (17) is connected to the supply side reel rotation detection means (8).
After resetting, the output signal C of the travel control signal detection means (6) starts counting, and the counted value of the travel control signal detection output signal C is determined by the next supply side reel rotation detection output signal R3. A travel control signal counting counter (17) is provided which outputs NS, resets again, and starts counting the output signal C of the travel control signal detection means (6). As a result, the number of travel control signals during one rotation of the supply reel (3) is counted, and a count value NS is output. Similarly, the take-up side travel control signal counting means (18) counts the travel control signals during one revolution of the take-up reel (2) and outputs a count value NT.

Next, the magnetic tape (1) recording speed and reel diameter determining means (21) determines the output count value NS of the supply side and winding side running control signal counting means (17), (+8),
With the count value N as input, the recording speed V of the magnetic tape (1)
Determine and output REC and reel hub diameter h.

This discrimination means (20) is connected to the supply side and the take-up side reel (
3) All recording speeds where the sum of the squares of the supply side and winding measurement line control signal count values during one revolution of (2) exists;
Since the combination of reel hub diameter and tape length has a unique value, a discrimination interval of the sum of squares is established for the existing combinations of recording speed and reel hub diameter, and the sum of squares of the count value NS and count value NT is determined. is calculated, the recording speed VREC, and the reel hub diameter h are determined and output.

The above will be further explained in detail based on FIG.

Figure 3 is a diagram showing the relationship between the count values of the side running control signals during one rotation of each of the supply side and take-up side reels (3) and (2). It is shown as an example. The horizontal axis shows the counted value of the side running control signal during one revolution of the supply side reel (3), and the vertical axis shows the counted value of the running control signal during one revolution of the winding side reel (2). The parameters are the hub diameter and recording speed specified in the VHS standard. As is clear from Figure 1, the sum of the areas of the magnetic tape (1) wound on each reel on the supply side and the take-up side when viewed from above is always constant and equal to the product of the tape length and tape thickness. , and the sum of these and the area of both reel hubs viewed from above is also always constant. The above area is proportional to the square sum of the outer circumference of the magnetic tape wound on each reel, and is also proportional to the square sum of the count value of the travel control signal per reel rotation, which is proportional to the outer circumference of each reel. Proportional. Therefore, the graph showing the relationship between the numerical values of both needles, as shown in FIG. 3, draws an arc for the same tape. And, as is clear from the figure, 1
The sum of squares of both counts has a unique value for all existing combinations of recording speed, reel hub diameter, and tape length, and can be determined by calculation.

Next, the calculating means (22) calculates the output i value NS of the -F supply-side traveling control signal counting means (17) and the above-mentioned determining means (2).
With the output of 2), the recording speed VREC of the magnetic tape (1) and the reel hub diameter rh are input, and the supply side reel (3) is
) is a calculation means that calculates the amount LS of the magnetic tape (1) wound around the magnetic tape (1) and outputs a signal corresponding to the amount LS of the magnetic tape. Here, the total length LS of the magnetic tape (1) wound around the supply reel (3) can be found as follows. Here, rs is the winding diameter of the magnetic tape wound on the supply reel (3),
rh is the hub diameter of the supply reel (3), and d is the thickness of the magnetic tape (1).

On the other hand, the amount of movement S of the magnetic tape (1) during one rotation of the supply reel (3) is determined by l s = NSx VREC,X T.

Here, T is the travel control signal recording period.

Therefore, the winding diameter rs of the magnetic tape (1) wound on the supply side reel (3) can be determined as follows.

As a result, the total length LS of the magnetic tape (1) wound around the supply reel (A) can be determined as follows. However, it is assumed that the tape thickness d and the travel control signal recording period are already known.

The calculation means (22) includes NS and (VREC, xT
) and (2πrh), and a multiplication means (23) to obtain MS・(VIIEC,XT).
4), and subtraction means (25) for subtracting (2πrh);
It is composed of a division means (26) for dividing 4πd.

(VREC,xT) is calculated only when the recording speed of the magnetic tape (1) changes, and (2πr11) is calculated only when the tape hub diameter changes.

The power supply control means (27) inputs a signal corresponding to the amount LS of magnetic tape wound on the supply reel (3) which is the output of the calculation means (22), and receives the signal corresponding to the amount LS of the magnetic tape wound on the supply reel (3).
is greater than a predetermined value, in order to increase the rewinding speed, the supply voltage of the power supply means (15) that supplies power to the motor that is the take-up reel drive means (9) that drives the take-up reel is increased. Outputs a control signal to increase the level.

In the case of the fast forwarding state of this embodiment, the drive stop control means (12), the start switch (14), the power supply means (16) and the high speed control means (20) act symmetrically in FIG. .

In the above embodiment, the recording speed of the magnetic tape and the reel hub diameter determining means (9) are based on the output count value NS of the supply side running control signal counting means (7) and the winding side running control signal counting means (8). Although it is shown by providing a discrimination interval to the sum of squares of the output count value NT.

A discrimination interval is provided for each of the count value NS and the count value NT,
A device may be provided that outputs the determination values of the recording speed and reel hub diameter of each magnetic tape (1) for any combination of determination sections.

The high-speed control means inputs the outputs of the winding side and supply side running control signal counting means, and outputs the recording speed of the magnetic tape and the reel hub diameter judgment value, and the output of the same judgment means and the supply side. A calculation means for outputting the amount of magnetic tape wound on the supply reel based on the output of the running control signal counting means, and a predetermined amount of magnetic tape wound on the supply reel which is the output of the calculation means. If the value of the magnetic tape is greater than or equal to the value of
Output of the winding side and supply side running control signal counting means such that the amount of magnetic tape wound on the supply side reel exceeds a predetermined value for all combinations of recording speed and reel hub diameter of a 3T capable magnetic tape. A high-speed control means is provided which sets in advance a range of a take-up side travel control signal count value and a supply side travel control signal count value, and outputs a high-speed control signal when each count value satisfies the same range. If such a high-speed control means is used, the configuration will be simpler than the above embodiment.

The present invention described above can be applied not only to video tape recorders but also to winding up long objects such as belts quickly and safely.

[Effects of the Invention] As described above, according to the present invention, when fast forwarding and rewinding, depending on the amount of tape wound on the supply reel, the speed is set to high speed when the tape is not at the end, and slow when the tape is at the end. By controlling the tape, it is possible to create a safe state in which no force is applied to the end of the tape, increase the average feed speed, and shorten the fast forward/rewind time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a fast-forward rewinding device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a specific example of a high-speed control device, and FIG. 3 is a block diagram showing a specific example of a high-speed control device, and FIG. FIG. 4 is a graph showing the relationship between count values of travel control signals during one revolution, and is a schematic diagram showing the configuration of a conventional fast forward/rewind device. (6)--Travel control signal detection means, (7)...Reel rotation detection means on the winding side, (8)...Reel rotation detection means on the supply side, (ta)--Transmission control on the winding side Signal counting means, (19)...High speed control means, (21)...
Discrimination means, (22)... calculation means. In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] (1) A take-up reel driving means for rotationally driving the take-up reel, a tape end detection means for detecting the end of the tape and outputting a signal, and driving the take-up reel by the output of the tape end detection means. drive stop control means for stopping the means; travel control signal detection means for detecting and outputting a tape travel control signal during fast forward rewinding; and take-up reel rotation for detecting the rotation period of the take-up reel and the supply reel. A detection means, a supply side reel rotation detection means, and an output signal of the traveling control signal detection means is counted and outputted during one revolution of the take-up side reel and the supply side reel in synchronization with the outputs of these rotation detection means. A winding-side running control signal counting means, a supplying-side running control signal counting means, and a high-speed control means that inputs the output of these running control signal counting means and outputs a high-speed control signal to the winding-side reel driving means. A fast forward/rewind device characterized by: (2) The high-speed control means includes a determination means for inputting the outputs of the winding side and supply side traveling control signal counting means and outputting determination values of the tape recording speed and reel hub diameter, and the output of this determination means and the above-mentioned and a calculation means for calculating and outputting the amount of tape wound on the supply side reel based on the output of the supply side running control signal counting means, and performs high-speed control when the amount of tape wound, which is the output of the calculation means, is equal to or greater than a predetermined value. Claim 1 configured to output a signal
The fast-forwarding and rewinding device described in Section. (3) The above-mentioned high speed control means controls the range of the winding side and supply side travel control signal count values in which the amount of tape wound on the supply side reel is equal to or greater than a predetermined value for all combinations of tape recording speed and reel hub diameter. The fast forward/rewind device according to claim 1, wherein the fast forward/rewind device is configured to be set in advance and to output a high speed control signal when each count value is within the set range. (4) The recording speed of the tape and the reel hub diameter determination means are configured to calculate two counts of the winding-side running control signal and the supply-side running control signal count, which are the outputs of the winding-side and supply-side running control signal counting means. 3. The fast forward/rewind device according to claim 2, which is configured to calculate a sum of products, determine the recording speed of the tape and the diameter of the reel hub from the calculated values, and output the determined values.