JPH10289508A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a tape slacking and an excessive tensil strength from being caused by detecting tape winding diameters and revolving speeds of respective tape reels at the time of FF/REW and calculating angular momentums of the reels to calculate proper braking timings. SOLUTION: When the instruction of FF/REW is issued, the fast revolving of a capstan motor is performed once in the mode of a reproduction/reversal reproduction and respective tape winding diameters are calculated from respective revolving speeds detected by a revolving speed of capstan motor detecting means 201, a revolving speed of S reel detecting means 202 and a revolving speed of T reel detecting means 203. Respective angular momentums are calculated from calculated winding diameters and revolving speeds of the reels and when an stop instruction is issued, a time difference of braking timings braking both reels is set based on the angular momentums. The setting of the time difference is performed step-wise by dividing the angular momentum into prescribed divisions every reel and according to respective divisions. Moreover, the time difference can be set continuously by expressing it as the function of the angular momentums of both sides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art A conventional example will be described below with reference to FIGS.

FIG. 4 is a plan view of a mechanism before a cassette is mounted, and FIG. 5 is a plan view of the back of the mechanism.

In FIG. 4, 1 is a magnetic tape, 2a is a capstan, 20 is a cassette, 30 is a substrate, 111 is a driving gear, 112 is a PR relay gear, 113 is a pull-out arm,
114 is an arm, 115 is a sub brake, 116 is a brake, 117 is a brake, 118 is a JOG arm, 11
9 is a tension arm, 120 is a tension band, 1
21 is a brake spring, 122 is a sub-spring,
123 is a tension spring, and 125 is a slow spring.

In FIG. 5, reference numeral 101 denotes a loading motor,
02 is a worm, 103 is a motor gear, 104 is a cam gear, 105 is a slider, 106 is a load gear, 106a
Is a link, 107 is a road gear, 107a is a link, 6
1 is a tape guide, 62 is a tape guide, 108 is a torque switching arm, 109 is a slow brake, 110 is an operation arm, and 124 is a torque switching gear.

The rotation is transmitted from the worm 102 rotating coaxially and integrally with the loading motor 101 to the cam gear 104 via the motor gear 103 in accordance with the switching of the operation mode of the mechanism and the rotation of the loading motor 101 which is the driving source of the operation element. .

The slider 105 slides in accordance with the rotation of the cam gear 104 when a rack (not shown) of the slider is engaged with a gear (not shown) of the cam gear 104.

The members directly controlled by the cam gear 104 are a load gear 106 for driving the tape guide 61, a load gear 107 for driving the tape guide 62, a sub-brake 115 in FIG. 4, and a tension arm 119.

The members directly operated by the slider 105 include a torque switching arm 108 and an operation arm 1.
10, the drive gear 111, the brake 116, the brake 117, the JOG arm 118, and the brake 13 in FIG.

After the cassette is mounted, the toothless portion (not shown) of the cam gear 104 drives the load gear 106 and the load gear 107, and the load gear 106 is connected to the link 106a, and the load gear 107 is connected to the tape guide 61 via the link 107a. The tape guide 62 is driven.

The drawing process of the magnetic tape 1 described above will be described with reference to FIG. A slider 105 (not shown) drives the drive gear 111 clockwise in the figure. Drive gear 11
1 drives the relay gear 112 counterclockwise in the figure, the relay gear 112 rotates the drawer arm 113 clockwise in the figure, and the magnetic tape 1 is pulled out of the cassette 20 by the drawer pin 113a. Next, a lifting gear (not shown) meshing with the relay gear 112 is
4 is lowered. After arm 114 descends, arm 1
14 is engaged with a control groove (not shown) of the relay gear 112, and the arm 114 is urged clockwise in the figure, whereby the magnetic tape 1 is pinched between the pinch roller 3 and the capstan 2a. Is done.

Next, the recording or reproducing mode will be described with reference to FIGS. FIG. 6 is a plan view of the tape winding system during recording or reproduction, and FIG. 7 is a plan view of the back side.

In FIG. 6, 1 is a magnetic tape, 2 is a capstan motor, 2a is a capstan, 2b is a capstan pulley, 3 is a pinch roller, 4 is a belt, 5 is a pulley section, 1
2 is a reel, 20 is a cassette, and 30 is a substrate. The magnetic tape 1 is pulled out of the cassette 20 mounted on the substrate 30 and wound around a cylinder 21 to perform recording and reproduction. The magnetic tape 1 is provided on the axis of the capstan motor 2, and is pinched by a pinch roller 3 and a capstan 2 a rotating integrally with the capstan motor.
The capstan 2 is transferred at a constant speed by the counterclockwise constant rotation.

Further, in FIG. 7, rotation is transmitted to the capstan pulley 2a via a toothed belt 4 hung on a capstan pulley 2b provided integrally with the capstan motor 2, and the pulley 5 and the slip clutch mechanism are transmitted. The magnetic tape 1 transmitted from the take-up gear (not shown) through the swing gear 8 in FIG. 6 to the reel 12 via the swing gear 8 in FIG. And wind it up.

During recording and reproduction, the tension arm 11 is used.
9 is urged in the counterclockwise direction in the figure by a tension spring 123, and a tension band 120 attached to the tension arm 119 applies a load to the reel 11,
A predetermined tension is applied to the magnetic tape 1 by the load.

Next, high-speed winding / rewinding (hereinafter FF /
The mechanism state at the time of (REW) will be described with reference to FIGS.

At the time of FF / REW, in FIG. 7, the slider 105 operates the torque switching gear 124 via the torque switching arm 108 to switch the torque to the transmission gear (not shown) which rotates coaxially with the pulley 5. By meshing the gear 124, the driving force of the capstan motor 2 is directly transmitted from the pulley 5 to the swing gear 8 in FIG. 6 without passing through the clutch mechanism (not shown).

At this time, in FIG. 6, the slider 105 (not shown) rotates the tension arm 119 clockwise through the operation arm 110 (not shown) to move the tension band 120 in the figure. By separating the reel from the reel 11, the tape winding load at the time of FF increases and the RE increases.
Prevents an increase in tape back tension during W.

Further, when the slider 105 rotates the arm 114 counterclockwise through the driving gear 111 and the driving gear 112, the pinch roller 3
Separate from a.

In recording, reproducing, and FF / REW, a control groove (not shown) of the slider 105 directly urges the brake 117 counterclockwise, and further urges the brake 116 clockwise via the brake 117. By doing so, the brake 116 is at a position separated from the relay gear 9, so that no braking force is generated on the relay gear 10 and the reel 11, and the brake 1
Reference numeral 17 denotes a position remote from the reel 12 and the reel 12
No braking force is generated.

When the mode shifts from the FF / REW mode to the stop mode, the control groove (not shown) of the slider releases the bias of the brake 117 by the movement of the slider 105 (not shown).
Is urged in a counterclockwise direction, the brake 117 is urged in a clockwise direction, the brake 116 brakes the reel 11 via the relay gear 9 and the relay gear 10, and the brake 117 brakes the reel 12. When braking, the capstan motor 2 is braked by a braking pulse.
To prevent the occurrence of excessive tape tension, the slider 1
A predetermined time difference is provided between the voltage application timing to the loading motor 101 for driving the drive motor 05 and the braking pulse application timing to the capstan motor 2.

Next, the setting of the time difference will be described with reference to FIG.

When the FF / REW command is issued, the capstan motor is once rotated in the mode of reproduction / reverse reproduction (reproduction corresponds to FF and reverse reproduction corresponds to REW), and the rotation of the capstan motor is performed. From the respective rotation speeds detected by the rotation speed detection unit 201, the rotation speed detection unit 202 of the S reel, and the rotation speed detection unit 203 of the T reel, S,
FF / REW after calculating the tape winding diameter on both reels
Transition to mode. Thereafter, the tape winding diameters on the reels 11 and 12 obtained from the calculated winding diameter as a starting point are always obtained, and when a stop command is issued, the time difference is set based on the winding diameter.

As described above, Japanese Patent Application Laid-Open No. Sho 62-114148 discloses a known example of a magnetic recording / reproducing apparatus that determines the braking timing of the reels 11 and 12 based on the data on the diameters of the reels 11 and 12. is there.

[0025]

When a reel is braked in FF / REW, tape slack or excessive tape is caused due to an imbalance between the angular momentum on the tape supply side, the angular momentum on the winding side, and the braking torque. Tension occurs.

However, in the prior art, the reel 11 and the reel 1 are determined only from the tape winding diameter of the reel 11 and the reel 12.
Since the braking timing is set to 2, the behavior of the tape during braking differs depending on the tape speed when the stop command is issued even at the same setting timing, and it is ideal to stop at any speed range. Have difficulty.

[0027]

In view of the above points, the present invention detects the tape winding diameter and the number of rotations of the tape reel 11 and the reel 12 at the time of FF / REW and calculates the angular momentum to obtain the optimum value. Set the braking timing.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below.

Since the mechanism of the present invention is the same as that described in the embodiment, here, when shifting from the FF / REW mode to the stop mode, the voltage application to the loading motor 101 and the capstan motor 2 are performed. The following description focuses on only the setting of the time difference provided between the application of the braking pulse to the motor.

FIG. 1 shows a process for setting the time difference. FF
When the / REW command is issued, the capstan motor is once rotated in the mode of reproduction / reverse reproduction (reproduction corresponds to FF and reverse reproduction corresponds to REW), and the rotation speed detection means 201 of the capstan motor is performed. From the respective rotation speeds detected by the rotation speed detection means 202 of the reel 11 and the rotation speed detection means 203 of the reel 12, the tape winding diameter on the reels 11 and 12 is calculated, and then the mode shifts to the FF / REW mode. After that, the reel 1 obtained from the calculated winding diameter as a starting point
The angular momentum around the reels 11 and 12 is always calculated from the winding diameters of the reels 1 and 12 and the rotation speeds of the reels 11 and 12, and when a stop command is issued, a time difference is set based on the angular momentum.

The method of setting the time difference may be such that the angular momentum on the reel 11 side and the reel 12 side is divided into predetermined ranges, and the angular momentum may be set stepwise according to each division, or the angular momentum on both sides may be set. By expressing it as a function, it is also possible to set it steplessly.

As shown in FIG. 2, even if the angular momentum around the reels 11 and 12 is not calculated, the detected reel 1
The time difference may be set according to the combination of the rotation speeds of the reels 1 and 12 and the calculated winding diameters of the reels 11 and 12.

According to this embodiment, there is provided a magnetic recording / reproducing apparatus in which, when the tape is stopped from FF / REW, problems such as tape slack and excessive tension do not occur irrespective of the winding amount of the tape or the rotation speed of the reel. Can be

[0034]

According to the present invention, there is provided a magnetic recording / reproducing apparatus which does not cause a problem such as tape slack or excessive tension when stopping a tape from FF / REW, regardless of the amount of tape winding or the number of rotations of a reel. can get.

[Brief description of the drawings]

FIG. 1 is a block diagram of a braking timing setting according to an embodiment of the present invention.

FIG. 2 is a block diagram of a braking timing setting according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a braking timing setting in a conventional example.

FIG. 4 is a plan view of the magnetic recording / reproducing apparatus before a cassette is mounted.

FIG. 5 is a plan view of the magnetic recording / reproducing apparatus before a cassette is mounted.

FIG. 6 is a plan view of the magnetic recording / reproducing apparatus during recording / reproducing.

FIG. 7 is a plan view of the magnetic recording / reproducing apparatus during recording / reproducing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic tape, 2 ... Capstan motor, 201 ... Capstan motor rotation number detection means, 202 ... Reel rotation number detection means, 203 ... Reel rotation number detection means.

Claims (2)

[Claims] 1. A magnetic recording / reproducing apparatus which draws out a magnetic tape in a cassette, winds the magnetic tape around a rotating cylinder on which a magnetic head is mounted, and transfers the magnetic tape in a state where recording and reproduction are performed. A capstan motor serving as a driving source for transporting, a take-up reel for winding the magnetic tape, a supply reel for supplying the magnetic tape, a unit for detecting a rotation speed of the capstan motor, and the take-up reel Means for detecting the number of revolutions of the supply reel, means for braking the capstan motor, braking means for applying frictional braking to the take-up reel and the supply reel, and the capstan detected by the detection means. Based on the number of rotations of the motor and the number of rotations of the take-up reel and the supply reel, Means for calculating angular momentum, and setting a time difference between braking of the capstan motor and braking of the take-up reel and the supply reel according to the angular momentum. Magnetic recording and reproducing device. 2. The braking system according to claim 1, further comprising the step of: braking the capstan motor based on a combination of the detected number of rotations of the capstan motor and the number of rotations of the take-up reel and the supply reel. A magnetic recording / reproducing apparatus comprising means for setting a time difference between the supply reel braking and the supply reel braking.