JPH0743854B2 - Motor drive control method for recording / reproducing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention transmits the rotational force of one motor to a supply gear or a take-up gear to rotate a supply reel stand or a take-up reel stand, and The present invention relates to a motor drive control method for a recording / reproducing apparatus that allows a vehicle to travel in a forward direction or a reverse direction.

[Outline of Invention]

According to the present invention, a supply gear, a take-up gear, a motor, a pulley gear to which the rotational force of the motor is transmitted, and a rotation direction of the pulley gear while meshing with the pulley gear to mesh with the supply gear or the take-up gear. In a recording / reproducing apparatus having a swinging gear, for example, when the swinging gear meshing with the supply gear is rotated to mesh with the winding gear, the motor is kicked to move the swinging gear. It is possible to engage with the winding gear without causing the swinging gear to idle by driving the motor with a normal voltage.

[Conventional technology]

Recording / playback device, for example, video tape recorder (VTR),
A tape recorder or the like is provided with a rotational force switching mechanism capable of individually rotating the supply reel base and the take-up reel base by one motor.

FIG. 1 is a plan view showing an outline of a rotational force switching mechanism of such a recording / reproducing apparatus. 1 is a supply gear attached to a supply reel base, 2 is a winding gear attached to a take-up reel base, 3 Indicates a motor, and a pulley 4 is attached to its shaft.

5 is a pulley gear, 6 is a pulley, and the pulley gear 5 and the pulley 6 are pivotally supported by a support shaft 7, and a belt 8 is provided between the pulleys 4 and 6.
Is stretched.

Reference numeral 9 denotes a swing arm, one end of which is rotatably supported by a support shaft 7 which supports the pulley gear 5 and the pulley 6.

Reference numeral 10 denotes a swinging gear pivotally supported on the other end side of the swinging arm 9, which meshes with the supply gear 1 and the pulley gear 5.

Although not shown, the swinging arm 9 and swinging gear 9 are not shown.
A limiter mechanism is provided between the and 10.

In the state shown in FIG. 1, when the supply gear 1 is rotated to wind the magnetic tape around the supply reel (not shown), when the motor 3 is normally rotated and the pulley 4 is rotated counterclockwise, Since the pulley gears 5 and 6 rotate counterclockwise via the belt 8, the swing gear 9 rotates clockwise. Therefore, the supply gear 1 rotates counterclockwise, and the magnetic tape can be wound around the supply reel. (REW
mode).

When the take-up gear 2 is rotated to wind the magnetic tape on the take-up reel (not shown), the motor 3 is rotated in the reverse direction to rotate clockwise, and the pulley gear 5 and the pulley 6 rotate clockwise. Therefore, due to the action of a limiter mechanism (not shown), the swinging gear 10 rotates about the support shaft 7 as an axis together with the swinging arm 9 as shown by the chain double-dashed line, and meshes with the winding gear 2. Therefore, the swinging gear
Since the 10 rotates counterclockwise to rotate the take-up gear 2 clockwise, the magnetic tape can be taken up on the take-up reel (FWD mode).

[Problems to be solved by the invention]

However, when the swinging gear 10 is swung (rotated) as described above, the FWD is selected depending on how to select the swinging torque of the limiter mechanism and the rising characteristics of the motor 3.
In the mode and REV mode, the swinging gear 10 may rotate during the swinging motion.

In such a case, the rotating swinging gear 10 runs idle without meshing with the supply gear 1 or the winding gear 2, or the rotating swinging gear 10 rotates while the swinging gear 10 is rotating. May mesh with. Therefore, there are problems that the magnetic tape cannot be wound around the supply reel or the take-up reel, and that the magnetic tape is damaged due to an abnormal tension applied to the magnetic tape due to abrupt rotation.

The present invention provides a motor drive control method for a recording / reproducing apparatus, which solves the above problems.

[Means for solving problems]

The motor drive control method of the recording / reproducing apparatus of the present invention, when rotating the swinging gear meshing with the supply gear or the winding gear to mesh with the winding gear or the supply gear,
First, the motor is kicked to cause the swinging gear to collide with the winding gear or the supply gear, and then the motor is driven with a normal voltage.

[Action]

In the motor drive control method of the recording / reproducing apparatus of the present invention, since the swinging gear meshes with the winding gear or the supply gear by the kick operation of the motor, it is possible to reliably mesh the swinging gear with the winding gear or the supply gear. it can.

〔Example〕

FIG. 1 is a plan view showing the outline of a rotational force switching mechanism of a recording / reproducing apparatus to which the present invention is applied, and the explanation of each symbol is omitted.

The method of switching the rotational force of the recording / reproducing apparatus of the present invention is such that the swinging gear 10 meshes with the supply gear 1 as shown by the solid line in FIG. 1 and meshes with the take-up gear 2 as shown by the chain double-dashed line. In this case, first, as shown in FIG. 2 (a), time t ₁
During this time, a voltage is applied to the motor 3 to reverse the rotation, and the drive is stopped for the time t ₂ , and then the voltage is applied again to the motor 3 to perform the reverse rotation. Then, as described above, the pulley gear 5 rotates clockwise, and the swinging gear 10 can be swung from the position indicated by the solid line to the position indicated by the alternate long and two short dashes line.
At this time, since the drive is stopped for the time t ₂ , even if the swinging gear 10 rotates while the swinging arm 9 is rotating,
The swinging gear 10 approaches the winding gear 2 and meshes with the winding gear 2 in a state where the rotational angular velocity is lowered to almost 0 as shown by the dotted line. Then, since the motor 3 rotates in the reverse direction again, the swinging gear 10 surely meshes with the winding gear 2 in a state where the rotation angular velocity is lowered, and the winding gear 2 can be rotated clockwise.

50m As an example, the swing torque is 45 g · cm, when the inertia of the reel drive system of 0.02g · cm · S ^2, the time t ₁
When S and time t ₂ were set to 50 mS or more, the swinging gear 10 could be properly meshed with the winding gear ₂ .

Further, as shown in FIG. 2 (b), first, a voltage for reversely rotating the motor 3 during the time t ₃ is applied, and then the motor 3 is braked during the time t _4. Good. Also in this case, even if the swinging gear 10 is rotated by the first kick motion, the rotation angular velocity thereof can be reduced during the next time t ₄ , and the same effect as that of the previous embodiment can be obtained. .

As described above, according to the motor drive control method of the recording / reproducing apparatus of the present invention, the swinging gear 10 can be reliably meshed with the supply gear 1 or the winding gear 2, and the magnetic tape is not abnormally tensioned. It will not damage the magnetic tape by giving it.

〔The invention's effect〕

As described above, according to the motor drive control method of the recording / reproducing apparatus of the present invention, when the swinging gear meshing with the supply gear or the winding gear is rotated to mesh with the winding gear or the supply gear, the motor is controlled. Since the swinging gear is made to abut against the winding gear or the feeding gear by kicking, the swinging gear can be surely engaged with the winding gear or the feeding gear, and an abnormal tension is given to the magnetic tape to give a magnetic force. This has the effect of not damaging the tape.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of a rotational force switching mechanism of a recording / reproducing apparatus to which the invention is applied, and FIGS. 2 (a) and 2 (b) are diagrams showing a voltage applied to a motor and a rotational angular velocity of a swinging gear. Is. In the figure, 1 is a supply gear, 2 is a winding gear, 3 is a motor, 5 is a pulley gear, 9 is a swing arm, and 10 is a swing gear.

Claims (1)

[Claims] 1. A supply gear, a winding gear, a motor, a pulley gear to which a rotational force of the motor is transmitted, and a pulley gear which meshes with the pulley gear to rotate in the rotation direction of the pulley gear to rotate the supply gear or the winding gear. In a recording / reproducing apparatus provided with a swing gear arranged to mesh with any of the take-up gears, the swing gear meshed with the supply gear or the take-up gear is rotated by rotation of the motor. When meshing with the winding gear or the supply gear, first, the motor is energized for a predetermined time (t1) to rotate the swing gear toward the winding gear or the supply gear, and then A motor drive control method for a recording / reproducing apparatus, characterized in that the motor is driven at a normal voltage after a predetermined time (t2) has elapsed.