JPH0424508Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The invention relates to a magazine drive device, and in particular moves a magazine into which an insert such as a cassette tape is inserted, and positions the specified insert at the cassette removal position. The present invention relates to a magazine drive device.

<Prior art> An automatic cassette changer mechanism that moves a magazine into which a cassette tape is inserted, positions the specified cassette tape at the cassette take-out position, and then sets the cassette tape in a cassette deck or the like for automatic playback. There is a cassette playback device.

When such a cassette playback device equipped with an automatic cassette changer is installed in a car, the cassette magazine is not always held horizontally; for example, when the car approaches a slope, the position of the cassette magazine changes in the direction of movement. The drive load of the cassette magazine is substantially increased or decreased.

<Problems to be Solved by the Invention> However, the conventional apparatus has not taken any measures against such fluctuations in the driving load of the cassette magazine.

For this reason, in the conventional device, there was a problem in that the cassette magazine could not be moved smoothly when the drive load increased when approaching a slope.

In particular, when the distance between the current position of the desired cassette tape and the target position (cassette receiving/ejecting port) is monitored, and when the distance becomes less than a predetermined distance, the drive power is switched to a small amount to control deceleration. As the driving load on the cassette magazine increases, the driving force becomes increasingly insufficient, and the movement of the cassette magazine may stop before reaching the target position.
Alternatively, it takes a long time for positioning, and furthermore, positioning errors occur, causing malfunction or failure of the device.

In light of the above, an object of the present invention is to provide a magazine drive device that can accurately move a magazine to a target position in a short time even when the drive load on the magazine increases.

<Means for Solving the Problems> FIG. 1 is a block diagram of a magazine drive device according to the present invention.

11 is a control unit, 12 is a timer, 13 is a magazine, 14 is a motor that moves the magazine, 15 is a sensor that detects that the magazine has moved by a predetermined pitch, 16 is a current position counter that monitors the current position of the magazine, and 17 is a It is a motor drive unit.

<Function> Specified desired insert (cassette tape, etc.)
The control unit 11 monitors the distance L between the current position and the target position (cassette receiving/ejecting position), and if the distance L is greater than a predetermined distance L _D , the motor drive unit 17 is commanded to perform continuous drive. A motor 14 is driven with high power to move the magazine 13 at high speed.

When the distance L becomes equal to or less than the predetermined distance L _D , the timer 12 is started to start timing, and the motor drive unit 17 is commanded to perform the first pulse drive to reduce the drive power of the motor 14 and move the magazine 13.
slow down the movement of

After the deceleration control, if the magazine 13 does not reach the target position even if the time T measured by the timer 12 reaches the predetermined time T _S , the control section 11 instructs the motor drive unit 17 to perform second pulse drive to drive the motor 14. drive power is increased compared to the case of the first pulse drive.

That is, if the driving load on the magazine increases and the target position is not reached even after a predetermined period of time has elapsed after deceleration control, the driving force of the motor is increased to quickly position the magazine at the target position.

<Embodiment> FIG. 1 is a block diagram of a magazine drive device according to the present invention, and FIG. 2 is a motor drive waveform diagram.

In FIG. 1, 11 is a control unit, 12 is a timer, 13 is a magazine in an automatic cassette chainer, 14 is a motor for moving the magazine, 1
5 is a sensor that detects that the magazine has moved by a predetermined pitch; 16 is a current position counter that monitors the current position of the magazine; and 17 is a motor drive unit.

The control unit 11 monitors the distance L between the current position of the specified desired cassette tape and the target position (cassette receiving/ejecting position), and () If the distance L is greater than or equal to a predetermined deceleration start distance L _D The motor drive unit 17 is commanded to continuously drive, and the motor 14 is driven with high power to move the magazine 13 at high speed (period T1 in Fig. ₂ ), () until the distance L becomes less than or equal to the predetermined distance L _D. When the temperature is reached, the timer 12 is started to measure time, and the motor drive unit 17 is commanded to perform the first pulse drive to reduce the drive power of the motor 14 to decelerate the movement of the magazine 13 (see T ₂ in Fig. 2). period), () After the deceleration control, if the magazine 13 does not reach the target position even when the time T measured by the timer 12 reaches the predetermined time T _S , the control section 11 causes the motor drive unit 17 to perform second pulse drive. is commanded to increase the drive power of the motor 14 compared to the first pulse drive (period _T3 in FIG. 2).

FIG. 3 is an explanatory diagram of the automatic cassette changer, and the magazine 13 has a plurality of cassette storage sections 13.
a, 13a, . . . , and each cassette storage portion stores a cassette tape 21, 21 . This magazine 13 has a guide member 22
a, it is configured to be movable relative to the cassette deck 23 in the direction of the solid line arrow along the rolling rollers 22b. Although the magazine drive mechanism is not shown, for example, a rack extending along the moving direction may be attached to one side of the magazine 13.
A magazine drive motor 14 (first
It is constructed by meshing pinion gears driven by

The cassette deck 23 has a main body 23a and a cassette receiving/discharging port 23b.

Although not shown, the cassette tape is moved in a direction perpendicular to the guide member 22a to remove the cassette tape from the cassette receiving/discharging port 14b to the cassette deck main body 23.
b and the cassette tape set in the cassette deck 23 is placed in the cassette storage section 21.
A cassette drawer mechanism stored in a is disposed so as to face the cassette receiving/ejecting port (it is located below the magazine 11 and cannot be seen).

Further, although not shown, a sensor 15 (FIG. 1) is provided which detects the movement of the magazine 13 by one cassette pitch and generates a signal. That is, the sensor 15 detects this and generates a signal each time the cassette storage section 21a correctly faces the cassette receiving/discharging port 23b.

FIG. 4 is a flowchart of motor drive control according to the present invention. The process will be explained below according to this flowchart.

(1) Operate the cassette selection switch (not shown) to input the position _Co of the cassette storage section where the desired cassette is stored, and start the automatic cassette changer.

The positions of the cassette storage sections 21a, 21a, . . . are sequentially 1, 2, 3, . . . from the left. Therefore, when the cassette tape stored in the leftmost cassette storage section 21a is selected, the cassette selection switch is operated to input 1.

Further, the position of the cassette storage section currently facing the cassette receiving/discharging port 23b is assumed to be _Cp . For example, if the third cassette storage section 21a from the left faces the cassette receiving/discharging port 23, C _p =3, and this C _p becomes the count value of the current position counter 16.

(2) The control unit 11 calculates the distance L between the position of the cassette storage section in which the desired cassette is stored and the cassette receiving/discharging port (target position) using the following formula |C _o −C _p |→L (1) calculate.

(3) Once the distance L is calculated, the control unit 11 calculates the distance L.
and a predetermined deceleration start distance L. (For example L _p = 1)
Distinguish the size of.

(4) If L>L _p (=1), the control section 11 instructs the motor drive unit 17 to perform continuous drive. As a result, the motor drive unit 17 generates a continuous waveform drive voltage (see period T1 in Figure ₂ ).
The motor 14 is rotated at high speed to move the magazine 13 at high speed.

(5) If the magazine 13 moves one cassette pitch, the sensor 15 detects this.

(6) Current position counter 1 due to movement of sensor 15
Step 6 executes the following equation C _p ±1→C _p (2) according to the moving direction of the magazine to update the current position C _p of the magazine, and repeats the process from step (2) onwards.

(7) In step (3), when the magazine 13 reaches the deceleration start position and L≦L _p (=1), the control section 11 instructs the motor drive unit 17 to perform the first pulse drive, and also starts the timer 12. starts timing.

The motor drive unit 17 generates a first pulse train having a predetermined peak value V _p1 and a predetermined duty D ₁ (%) according to the first pulse drive command.
P ₁ (see FIG. 2) is applied to the motor 14 to reduce the moving speed of the magazine 13.

(8) L until sensor 15 operates during deceleration control
=1 (L≠1).

(9) If L=1, the control unit 11 checks whether the time T measured by the timer 12 has exceeded a preset time _Ts , and if T< _Ts , starts the first pulse drive. continue.

(10) If the magazine 13 moves by one cassette pitch and the sensor 15 is activated before T≧T _s , the current position counter 16 calculates the equation (2) (C _p
=C _o ), and in step (8), L=O. As a result, the control section 11 issues a stop command to the motor drive unit 17 to stop driving the motor.

(11) On the other hand, if T≧T _s before the magazine 13 reaches the target position, the control section 11 instructs the motor drive unit 17 to perform the second pulse drive.

As a result, the motor drive unit 17 applies a second pulse train P2 (see FIG. 2) with a peak value V _p2 (>V _p1 ) and a duty D (%) to the motor 14, and the first pulse train (see FIG. The motor drive power is increased compared to V _p1 , D%).

(12) The magazine 13 is moved to 1 by the second pulse drive.
When a signal is generated from the sensor 15 after moving by the cassette pitch, the current position counter 16 updates the current position C _p according to equation (2). Note that C _p =C _o .

As a result, the distance L obtained by calculating equation (1) becomes O, and thereafter the control section 11 inputs a movement stop command to the motor drive unit 17 and ends the positioning control.

Note that if the driving power during continuous driving is P1, the driving power during first pulse driving is P2, and the driving power during second pulse driving is P3, there is a relationship of P1>P3>P2.

In addition, although the case where the drive power during the second pulse drive is increased compared to the drive power during the first pulse drive by changing the peak value has been described above, the wave height value is changed as shown in FIGS. 5A and B. The driving power may be controlled by changing the duty without changing the high value. However, FIG. 5A shows a sequence in which the duty is controlled by changing the pulse width with a constant pulse width, and FIG. 5B shows a sequence in which the duty is controlled by changing the pulse width with a constant period.

Although the present invention has been described above in the case where it is applied to an automatic cassette changer, the present invention is not limited to such a case, but can also be applied to a magazine drive that accommodates a large number of disks, and other applications.

<Effects of the invention> According to the invention, the distance between the current position and the target position of a predetermined insert is monitored, and if the distance is greater than or equal to a predetermined distance, the motor is driven with the first electric power P1,
When the predetermined distance is reached, the second power P2 (P2<
P1) drives the motor to perform deceleration control, and if the magazine does not reach the target position even after a predetermined period of time has passed after the start of deceleration, the third power P3 (P2<P3<P1)
Since the magazine is configured to be quickly positioned at the target position by driving the motor, even if the driving load on the magazine increases on a slope, etc., the magazine can be moved accurately and reliably to the target position in a short time. be able to.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the magazine drive device according to the present invention, Fig. 2 is a motor applied voltage waveform diagram, and Fig. 3 is a diagram of the motor applied voltage waveform.
4 is a flowchart of the process according to the present invention, and FIG. 5 is another example of the voltage waveform applied to the motor for controlling the drive power. 11...control unit, 12...timer, 13...
Magazine, 14...Motor, 15...Sensor, 1
6...Current position counter, 17...Motor drive unit.

Claims (1)

[Claims for Utility Model Registration] In a magazine drive device that moves a magazine in which a plurality of inserts are mounted and positions a designated predetermined insert at a target position, the current position of the designated predetermined insert is monitoring means for monitoring the distance between the target position and the target position; a timing means for starting time measurement when the distance reaches a predetermined distance; a motor for moving the magazine; and a motor for moving the magazine; The motor is driven by the first electric power P1, and when the predetermined distance is reached, the motor is driven by the second electric power P2 (P2<P1), and the target position is reached even if the measured time reaches the predetermined time. If not, the third power P3 (P
1. A magazine drive device comprising a motor drive unit that drives a motor at a ratio of 2<P3<P1.