JPH0814909B2 - Reel drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has a reel driving device in a mechanism that has traveling modes with different traveling speeds and that causes a tape-shaped body to travel between two reels according to the traveling mode. It is about.

[Conventional technology]

Conventionally, in a mechanism for running a tape-shaped body between two reels, for example, a so-called direct drive tape-shaped structure in which a winding-side reel cradle and a supply-side reel cradle are directly driven by different motors. In the case of a recording / reproducing apparatus having a body traveling mechanism, when traveling of the tape-shaped body is stopped, the winding-side reel pedestal drive motor is stopped, and at the same time, the supply-side reel pedestal drive motor is rotated in the same direction as it has been. Generated a constant torque in the opposite direction to brake the reel rotation.

[Problems to be solved by the invention]

In these conventional methods, the braking force is not controlled according to the rotation state of the reel, and the rotation state of the reel changes every moment according to the amount of tape-shaped body wound on the reel. Since a certain amount of reverse torque was generated in the rotation driving means of the reel to brake the rotation of the reel, sudden braking will be applied especially when the reel is rotating at a high speed.
Due to the inertia of the reel or the impact of braking, the tape-like material wound around the reel may be stretched, loosened, or otherwise damaged. For example, in a recording / reproducing device, a tape is used for long-term recording / reproducing. This has been an obstacle to attempts to reduce the thickness of the body.

The present invention has been made in view of the above circumstances, and provides a reel drive device with a simple configuration that eliminates abrupt changes in the tape-shaped body even when the tape-shaped body stops traveling, and stably stops the tape-shaped body. The purpose is to do.

[Means for solving problems]

The present invention has been made in order to solve the above-mentioned problems, and in a reel drive device that causes a tape wound on a plurality of reels to travel at a plurality of different speeds according to modes, among the plurality of reels, First rotation drive means for rotationally driving a supply-side reel for sending the tape to the take-up reel, and rotation of a take-up reel for winding the tape sent from the supply-side reel among the plurality of reels. Second rotation driving means for driving, judging means for judging the winding amount of the tape wound on the reel, storage holding means for storing and holding the winding amount information judged by the judging means, First derivation means for deriving the driving torque of the first rotation driving means from the winding amount information stored and held by the storage holding means, and first based on the winding amount information judged by the judging means. Second derivation means for deriving the drive torque of the first rotation drive means, third derivation means for deriving a constant drive torque for driving the second rotation drive means, and an instruction to switch the mode. The second means is driven by the instruction means and the drive torque derived by the third deriving means.
The tape winding amount is controlled by driving the rotation driving means of the first rotation driving means, and in the predetermined traveling mode, the first rotation driving means is driven by the driving torque derived by the second derivation means. When the instruction means gives an instruction to switch from the predetermined traveling mode to the traveling stop mode, the driving torque derived by the first derivation means from the winding amount information stored and held by the storage holding means a predetermined period before. And a control unit for controlling the amount of the tape delivered by driving the first rotation drive unit.

[Action]

According to the above configuration, when the stop instructing means gives an instruction to stop, the rotation driving means for the reel is driven for a predetermined period by using the control information according to the rotation state of the reel a predetermined period before the instruction. It can be controlled.

〔Example〕

 Hereinafter, the present invention will be described based on examples.

FIG. 1 is a schematic configuration diagram when it is applied to a tape drive stopping mechanism of a VTR of a direct drive system in which a reel receiving stand on a winding side and a reel receiving stand on a supply side are directly driven as an embodiment of the present invention.

FIG. 2 is a timing chart when measuring the cycle data according to the rotation cycle of the reel holder in FIG.

FIG. 3 is a diagram showing the relationship between the winding diameter of the tape on the supply-side reel and the torque in each running mode of FIG.

In FIG. 1, a plurality of small pieces of magnets or the like are attached at equal intervals on the circumference of the supply-side reel pedestal 1 and fixed pick-up heads 2 are installed, and the output thereof is compared signal generator 3
To the second signal from the comparison signal generator 3.
A comparison signal corresponding to the rotation cycle of the reel holder 1 as shown in FIG. 4A is output and input to the cycle measuring circuit 4.

A reference pulse having a frequency sufficiently higher than that of the comparison signal (a) as shown in FIG. 2 (b) is input from the reference pulse generator 5 to the period measuring circuit 4. In 4, the number of pulses of the reference pulse (b) is counted and the period data t as shown in FIG. 2 (c ₁ ) to (c ₄ )
Is input to the cycle / roll diameter conversion circuit 6.

In addition, the cycle / roll diameter conversion circuit 6 includes a mode setting circuit 7
The tape running speed information signal V in the running mode set by is also supplied, and the cycle / winding diameter conversion circuit 6 uses these input information signals to winding diameter r of the tape wound on the supply side reel. Is calculated based on the relational expression of r = V · t / 2π, and the result is output as the tape winding diameter information signal rs of the supply side reel.

The output of the cycle / winding diameter conversion circuit 6 is input to the memory circuit 8 and the switches 9 and 11. The switching operation of the switches 9 and 11 is controlled by the stop instruction signal St generated by the mode setting circuit 7. The stop instruction signal St generates a high (H) level signal only when the tape (not shown) is switched from the running state to the stopped state. The switch 9 is turned off by the inverter 10 when the stop instruction signal St output from the mode setting circuit 6 is at H level, and is turned on when it is at low (L) level. That is,
The cycle / winding diameter conversion circuit 6 during traveling other than when stopped
The tape winding diameter information signal rs of the supply side reel output from the supply side is supplied to the tape running torque control circuit 12, and in the tape running torque control circuit 12, when the tape running according to the tape winding diameter of the supply side reel is performed. Generate a proper torque information signal. The switch 11 is connected to the L side in the drawing when the stop instruction signal St is at the level, and the tape reel diameter information signal rs of the supply side reel via the switch 9 is input to the reel diameter conversion circuit 13. A tape length information signal D indicating the length of a tape (not shown) is input to the winding diameter conversion circuit 13 in addition to the winding diameter information rs. In this circuit, the winding side is based on the above information. The reel winding diameter information rt is calculated and supplied to the tape running torque control circuit 14. Further, the torque control circuit for running the tape
Reference numeral 14 generates an appropriate torque information signal during tape running according to the winding diameter of the tape on the take-up side reel as in the case described above.

On the other hand, the tape reel diameter information signal rs of the supply-side reel is also input to the memory circuit 8. This memory circuit 8 is for temporarily storing the reel diameter information signal rs. When the winding diameter information signal rs input to the circuit 8 changes, it is rewritten.

When the supply side switch 15 temporarily stored in the memory circuit 8 is turned on, it is read out and supplied to the switch 11 and the winding diameter / torque conversion circuit 16. The switch operation of the switches 11 and 15 is controlled by the stop instruction signal St generated from the mode setting circuit 7. That is, when the tape (not shown) is switched from the running state to the stopped state, an H level signal is generated, the switch 15 is turned on, and the memory circuit 8
The winding diameter information signal rs temporarily stored at is supplied to the winding diameter / torque converting circuit 16 and also to the switch 11. The switch 11 is connected to the H side in the figure when the stop instruction signal St is at the H level, and from the winding diameter information signal rs of the supply side reel output from the memory circuit 8, the winding diameter conversion circuit 13 takes up the winding side. Calculate the reel diameter information signal rt
It is supplied to the torque conversion circuit 17.

As described above, the winding diameter / torque conversion circuits 16 and 17 are supplied with the winding diameter information signal rs on the supply side and the winding diameter information signal rt on the winding side. Here, the appropriate torque according to the winding diameter information is supplied. Value information T
Is generated. The winding diameter / torque converting circuits 16 and 17 are constituted by a memory table, and suitable torque value data corresponding to the reel winding diameter as shown in FIG. 3 is stored in advance in the memory table. The input winding diameter information signal is read and output as an address. The memory tables of the winding diameter / torque conversion circuits 16 and 17 are divided into three tables according to the running speed of the tape.
The table switching circuit 18 is switched by a memory / table switching signal generated based on the tape traveling speed information signal V output from the mode setting circuit 7. Third
In the figure, A is for reproduction or recording, B is for high-speed search,
C shows the relationship between the winding diameter of the tape on the supply side reel and the appropriate torque value at the time of fast-forwarding or rewinding. In the winding diameter / torque converting circuits 16 and 17, the tape is shown in FIG. 3 according to the running speed of the tape. Three memory tables having the characteristics shown are switched, information of an appropriate torque value according to input reel winding diameter information is output, and supplied to the switches 19 and 20.

Further, constant torque value information is also supplied to the switches 19 and 20 from the first fixed torque generating circuit 21 and the second fixed torque generating circuit 22, respectively, which are output by switching according to the switch operation of the switches 19 and 20. Side motor drive circuit 23,
It is supplied to the winding side motor drive circuit 24.

The switching operation of the switches 19 and 20 is switched according to the tape traveling direction information signal F / R output from the mode setting circuit 7.

That is, when the tape is running in the forward direction, the tape running direction information signal F / R output from the mode setting circuit 7 is H level when the tape is running in the forward direction and L when it is in the reverse direction. In order to generate a level signal, the switches 19 and 20 are connected to the H side at the H level and to the L side at the L level according to this signal. Further, when the tape traveling direction information signal F / R is at H level, the switch 25 is also turned on.
By this switching operation, when the tape is running in the forward direction, the winding side motor drive circuit 24 uses the fixed torque value information generated by the second fixed torque generation circuit 22 to cause the winding side reel motor 26 to generate the torque. A certain torque is generated according to the value information to rotate the take-up reel pedestal 27. The supply side motor drive circuit 23 receives the torque value information signal generated by the tape running torque control circuit 12 during running and the winding diameter / torque conversion circuit 16 during stop, and supplies the side motor drive circuit 23. Thus, the rotation torque of the supply-side reel motor 28 is controlled to keep the tape tension constant when the tape is running and when it is stopped.

On the other hand, when the tape is running in the reverse direction, the tape running direction information signal F / R output from the mode setting circuit 7 is at L level, so that the switches 19 and 20 respond to this signal by L in the figure. Switch 29 is connected to the inverter 30
Is turned on by the action of. When the tape is running in the reverse direction due to this switching operation, the supply side motor drive circuit 24
In accordance with the fixed torque value information generated by the first fixed torque generating circuit 21, a constant torque corresponding to the torque value information is generated in the supply reel motor 28 to rotate the supply reel pedestal 1. The winding side motor drive circuit 24 receives the torque value information signal generated from the tape running torque control circuit 14 during running and the winding diameter / torque conversion circuit 17 during stop, and drives the winding side motor. The circuit 24 controls the rotational torque of the reel motor 26 on the take-up side to keep the tape tension constant when the tape is running in the reverse direction and stopped.

As described above, the appropriate torque value information at the time of stop is calculated from the reel diameter information of the supply side reel calculated immediately before the stop, and the appropriate torque value information of the supply side reel drive motor is calculated from this appropriate torque value information. By controlling the torque and controlling the amount of the tape fed out from the reel on the supply side, the tape running can be stopped while maintaining an appropriate tape tension, and the adverse effect on the tape can be reduced.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a reel drive device having a simple structure, which eliminates a steep change in the tape-shaped body even when the tape-shaped body is stopped running and stably stops the tape-shaped body. You can do it.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram when it is applied to a tape drive stopping mechanism of a VTR of a direct drive system in which a reel receiving stand on a winding side and a reel receiving stand on a supply side are directly driven as an embodiment of the present invention. FIG. 2 is a timing chart when measuring the cycle data according to the rotation cycle of the reel holder in FIG. FIG. 3 is a diagram showing the relationship between the winding diameter of the tape on the supply-side reel and the torque in each running mode of FIG. 4 Cycle measuring circuit 6 Cycle / winding diameter conversion circuit 7 ...... Mode setting circuit 8 …… Memory circuit 16,17 …… Rolling diameter / torque conversion circuit 21 …… First fixed torque generation circuit 22 …… 2 fixed torque generation circuit

Claims (1)

[Claims] 1. A reel drive device for running tapes wound on a plurality of reels at a plurality of different speeds according to modes, wherein a supply-side reel for feeding the tapes to a take-up reel among the plurality of reels. A first rotation drive means for rotating and driving the second reel, and a second rotation driving means for rotating and driving a winding-side reel for winding the tape delivered from the supply-side reel among the plurality of reels.
Rotation driving means, judging means for judging the winding amount of the tape wound on the reel, storage holding means for storing and holding the winding amount information judged by the judging means, and the storage holding means. A first derivation of a driving torque of the first rotation driving means from the stored and stored winding amount information.
Deriving means, second deriving means for deriving the driving torque of the first rotation driving means from the winding amount information judged by the judging means, and constant driving for driving the second rotation driving means. Third tape deriving means for deriving torque, instruction means for instructing switching of the mode, and drive tape for the tape by driving the second rotation drive means with the drive torque derived by the third deriving means. The winding amount is controlled, and in the predetermined traveling mode, the second
When the first rotation driving means is driven by the driving torque derived by the deriving means and the instruction means instructs to switch from the predetermined traveling mode to the traveling stop mode, the memory holding is performed before a predetermined period. Driving the first rotation drive means with the drive torque derived by the first derivation means from the winding amount information stored and held by the means, and controlling means for controlling the tape delivery amount. Characteristic reel drive device.