JPH03252955A - Tape driving device - Google Patents

Abstract

PURPOSE:To alleviate damage of a tape by controlling both reel motors in drive in order to reduce the traveling speed of the tape when the speed is shifted from fast forward traveling to stop and controlling a mechanism braking means in order to brake the tape to stop when the speed is dropped down to a prescribed speed. CONSTITUTION:This device is provided with a speed reduction control means for controlling both reel motors 3 and 4 in drive to reduce the traveling speed of the tape so as to gradually decelerate the traveling speed when the tape traveling is higher than a prescribed speed of a braking start reference at the time of shifting the traveling speed from fast forward traveling to stop. In addition, a stop control means is provided to brake and stop the traveling by driving the mechanical braking means 7 when the traveling speed is lowered to the prescribed speed. These fast forward traveling control means, tape speed calculating means, speed reduction control means and stop control means are formed by a microcomputer 9. By this method, the tape is rapidly stopped while preventing damage due to strong mechanical braking.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tape drive device for a tape recorder such as a single-rotation head type DAT, and in particular, when stopping the tape by braking from a high-speed running state in which a reel motor is driven. Concerning what controls the

[Conventional technology]

Conventionally, tape recorders such as DAT have a fast forwarding mode of 9.
During rewinding, the reel motor is driven to run the tape at high speed.

In addition, when transitioning from high-speed running to stop and stopping the tape running, in many cases, the same way as when transitioning from low-speed running such as normal running for recording and playback to stopping7 For example, from the plunger solenoid and friction brake. 1wk mechanical braking by mechanical braking means (hereinafter referred to as mechanical brake)
The brake is applied to stop the vehicle.

This mechanical brake provides a strong braking force at times, so when the tape is running at a very high speed (hereinafter referred to as tape speed), such as in a DAT data recorder, excessive force is applied to the tape. It has the inconvenience of dealing heavy damage based on Tenshiden.

Therefore, *Opening and Closing Publication No. 59-86057 (GIIB 1
5/48), when transitioning from high-speed running to stop, before applying the mechanical brake, the drive of the reel motor is switched from high-speed to low-speed for a preset period of time, and the tape speed is lowered. Tape drives are described that provide mechanical braking to stop and reduce such damage.

[Problem to be solved by the invention]

In the case of the conventional tape drive device described in the above publication.

When transitioning from high-speed running to stop, the reel motor is unconditionally operated at low speed S [XiE! Since the mechanical brake is applied after I and the tape is stopped, the amount of tape travel (overshoot amount) in the case that stops
There is a problem in that it is not possible to reduce the amount of water to the necessary minimum amount and stop it quickly.

That is, the time required for the tape speed to decrease to the speed at which no damage occurs (hereinafter referred to as safe speed) after switching the drive of the reel motor to a low speed varies depending on the tape load condition at that time.

Therefore, the predetermined time is set with enough margin to ensure that the tape speed drops below the safe speed.

In this case, depending on the tape load state, etc., the tape may run longer than necessary by continuing to run at low speed for the predetermined time, and then stop.

It was a cabinet. Also when transitioning to a stop from a state in which the period of fast forwarding or rewinding is so short that the tape speed has increased only at a speed sufficient to immediately apply a mechanical brake, the above-mentioned t
-frThe mechanical brake is not applied until after the low-speed drive wJ between constant WA, and the tape stops after running longer than necessary.

Moreover, since the tape speed is reduced by stepping the reel motor drive from high speed to low speed,
There is also the problem that the tape is easily damaged in the early stages of deceleration.

The present invention is applicable when transitioning from high-speed driving to stopping.

It is an object of the present invention to provide a tape drive device capable of quickly stopping the tape by minimizing damage to the tape due to deceleration drive and braking.

[Means to solve the problem]

In order to achieve the above object, the tape drive device of the present invention includes a pair of tape reels on a tape feeding side and a tape winding side.

two reel motors that drive each of the two reel reels, two rotation detectors that detect the rotation of each of the two reel motors and generate a rotation pulse signal whose cycle changes according to the rotation speed, and the direction rotation. tape speed calculation means for calculating the running speed of the tape from the period of the rotation pulse signal of the detector;

When the tape transitions from high-speed running to stopping, the tape is decelerated by controlling the drive of both reel motors so that the running speed gradually decreases when the running speed is higher than a predetermined speed of a braking start reference. A deceleration control means for traveling.

A stop control means is provided for driving a mechanical braking means to stop driving both the reel motors and stop the tape when the running speed decreases to the predetermined speed.

[For production]

In the case of the tape drive device of the present invention configured as described above, the tape speed is monitored by calculation by the tape speed calculating means when the tape moves from high-speed running to stopping.

If the tape is damaged by applying a mechanical brake when the tape speed is greater than the predetermined speed of the braking start reference, the tape speed is gradually decelerated so as not to damage the deceleration control means.

In addition, when the tape speed decreases to the predetermined speed, the stop-side means drives the mechanical braking means to apply a mechanical brake, and a strong braking force immediately stops the reel motor and stops the tape from running. To live.

The deceleration drive period by the deceleration control means changes depending on the tape load, etc., and deceleration drive is performed only during the period i during which the tape speed decreases to the predetermined speed, so that the tape travel distance until the tape stops is The amount can be kept to a minimum depending on the load etc.

It was. If the tape speed during high-speed running is lower than the predetermined speed of the control start reference, the mechanical brake is applied immediately, omitting the above-mentioned deceleration theory.

〔Example〕

Regarding the 151ir embodiment, in FIG. 1 with reference to FIGS. 1 to 3, (1) is the tape reel on the supply side.

(2) is the tape reel on the winding side, (3), (4
) is the supply side.

Reel Tanabata on the take-up side, (5) and (6) are two FG detection units as a rotating extruder that detect the rotation of the two take-up and side reel motors (3) and (4) on the supply side. (7) is a mechanical braking means formed using a plunger solenoid and a friction body, and (8) is a reel motor drive four-way that drives the reel motors (3) and (4).

(9) is a microprocessor for control, and QO is a tape.

(G), (2), C13, Q is a tape guide post,
QS is a capstan, Qe is a pinch roller 2α7) is a rotating cylinder.

(2) The α-wound is a pair of rotating magnetic heads for recording and reproducing installed on the rotating cylinder α-force.

A microprocessor (9), high speed running control means, tape speed calculation means, deceleration control means, and stop control means are formed.

Next, the operation when the tape moves from high-speed running to stopping will be explained.

First, based on settings such as high-speed search, high-speed fast forwarding or rewinding is commanded to TO. The series-7 remote motor drive circuit (
8), fast forward or rewind is commanded.

For example, when the reel switching circuit (8) and the reel switching circuit (3) and (4) are driven, the tape O0 is at the specified high speed! From J-/L'(1)! J −/l/(2
) to drive at high speed.

The rotation of the reel motors (3) and (4) is detected by the FG detectors (5) and (6), and the rotation of the reel motors (3) and (4) is detected by the FG detectors (5) and (6).
(6) constantly supplies the microprocessor (9) with a rotation pulse signal (hereinafter referred to as FG multiplied signal) whose period changes depending on the rotational speed of the reel motors (3) and (4).

Based on the stop control flowchart shown in FIG. 2, the microprocessor (9) calculates the high speed running by 8 times and at the same time calculates the tape speed by the tape speed calculation means by 8 times.

Then, the tape speed Vt at time 2 is calculated from the formula Vt=N・■− using the standard tape speed Vo during normal running.
Tso and TTO are the reel motors (3
).

The FG double signal period, TS, and TT in (4) are the FG double signal period of the reel motors (3) and (4) at time t.

Therefore, the tape speed calculating means calculates the preset circumference J.
9ITso, TTO data and reel motor (3
).

The tape speed Vt during high-speed running is calculated based on the momentary period Ts and TT data obtained by measuring the FG multiplied signal repeat in (4).

Then, when the microprocessor (9) is instructed to shift from high-speed running to stop based on a high-speed search end command, etc., the microprocessor (9) performs the tape speed at the point 2, for example, b or t2 in FIG. Vt+ or Vtz is compared with a predetermined braking start reference speed (hereinafter referred to as reference speed) Vref set in advance.

This reference speed Vref is immediately applied to the mechanical braking means (7).
Even if the running of the tape 00 is stopped by driving the tape QO and applying a mechanical brake, damage to the tape QO is extremely small.

In the case of 1+ when the high-speed driving period is extremely short,
Since Vtl<Vref and the tape speed is lower than the reference speed, the microprocessor (9) immediately drives the mechanical braking means (7) as a stop control means.
l/ (1) and (2) as well as providing strong braking force.

The reel motor drive circuit (8) is commanded to stop and the reel motors (3) and (4) are turned off.

At this time, the tape speed changes along the track J)l+I+ connecting points a, b, and c in Figure 3, and the stop command timing 1
+ coincides with the timing tbt at which the tape OQ actually stops, and the tape αO stops extremely quickly.

On the other hand, at 12 o'clock, which is a general stop command condition, Vt2
> Vref and the tape speed is as high as the reference speed, the microprocessor (9) controls the reel motor (3) by the deceleration control means before driving the mechanical braking means (7).
), continue driving (4).

At this time, the reel motor drive circuit (
8) is controlled to decelerate drive.

Based on this control, the reel motors (3) and (4) are driven at a reduced speed so as not to damage the tape α0.

Then, when the tape speed decreases by the reference speed Vref i, the microprocessor (9) shifts from the deceleration control of the deceleration control means to the braking of the stop control means, and drives the mechanical braking means (7) 1i. Reel motor (3), (
4) is turned off to stop running the tape (1).

The timing at which the tape speed is dynamically reduced to Vref coincides with the timing tb2 at which the tape αQ actually stops.

Then, the deceleration drive period (tb2-tp) changes depending on the tape load conditions, etc., and the deceleration drive is performed for the minimum necessary period, minimizing the amount of overshoot of the tape α0, and quickly stopping the tape QQ. do.

The configuration of the mechanical braking means (7), etc. is not limited to the embodiment.

And it can be applied to stopping various types of tape recorders from running at high speed.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

The running speed of the tape is monitored by calculation by the tape speed calculation means, and based on this monitoring, if the running speed is smaller than a predetermined speed when transitioning from high-speed running to stop, a mechanical brake is immediately applied to stop the tape. If the running speed is higher than the predetermined speed, the tape is gradually decelerated to the predetermined speed and then a mechanical brake is applied to stop the tape. It can quickly stop the tape by preventing damage caused by powerful mechanical brakes, and is particularly effective when applied to data recording tape recorders (data recorders) that operate at high speeds. play.

[Brief explanation of drawings]

The drawing shows 19! of the tape drive device of the present invention. 1 is a block diagram, FIG. 2 is a flowchart for explaining control, and FIG. 3 is a characteristic diagram of tape speed. (1) , (2) ...cheaply, u, (3n,
(4)--Reel motor. (5J, (6)...FG detector, (7)...mechanical braking means, (8)...reel motor drive 1c circuit, (
9)...Microprocessor. Q (1... tape. Figure 1

Claims (1)

[Claims] (1) A pair of tape reels on the feeding side and the winding side of the tape, two reel motors that drive each of the tape reels, and detecting the rotation of each of the two reel motors and adjusting the cycle according to the rotation speed. two rotation detectors that generate rotation pulse signals that vary in speed; tape speed calculation means that calculates the running speed of the tape from the cycle of the rotation pulse signals of both rotation detectors; a deceleration control means that controls the drive of both reel motors so that the tape runs at a reduced speed so that the running speed gradually decreases when the running speed is higher than a predetermined speed of a braking start reference; A tape drive device comprising: a stop control means for driving a mechanical braking means to stop driving of both the reel motors and braking the tape when the running speed decreases to the predetermined speed.