JPH0245254B2 - TEEPUHIKIDASHIKIKO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a cartridge type recording/playback machine, and particularly to a cartridge-type recording/playback device that draws out a tape from a tape cartridge and creates a tape running path in which the tape is brought into contact with a fixed head via a fixed tape guide. The present invention relates to a tape pull-out mechanism for recording and reproducing data.

(b) Prior Art and Problems Conventionally, as shown in FIG. There is a method of driving the arm 1 by directly connecting it to the shaft, or a method of driving the rotating shaft 4 of the arm 1 by slowing down the rotation by the motor 5 using gears 6, 7, etc., as shown in FIG. In addition,
8 is a fixed head, 9 is a fixed guide, 10 is a tape, S is an arm position detection sensor, and P is a tape guide located inside the cartridge.

The former has the disadvantage that if the reverse torque of the motor 5 is not greater than the tape tension during tape running, the arm 1 will move due to the tape tension, so a motor 5 with a large reverse torque must be used. Since the speed is reduced by gears 6, 7, etc., there is a drawback that the tape drawing time is longer. What is common to both is that if the control circuit of the motor 5 is broken and current continues to flow through the motor 5, the arm 1
When a stopper (not shown) is applied to stop the motor 5, the rotation of the motor 5 is stopped, but the current continues to flow, so there is a risk that the motor 5 may be burnt.

(c) Purpose of the Invention The purpose of the present invention is to use a swinging slider crank mechanism in the tape pull-out mechanism, so that the arm can be moved by the tape tension even though a motor with relatively low reverse torque is used. To provide a tape drawing mechanism which prevents the motor from burning out even if the control circuit of the motor for rotating an arm is broken and current continues to flow through the motor.

(d) Structure of the Invention According to the present invention, this object is to provide a cartridge-type recording/playback machine that draws out a tape from a tape cartridge by rotating a tape drawing member having a tape roller on the arm about the fulcrum of the arm. In the tape pull-out mechanism, a link groove is provided in the arm, and a crank plate, one end of which engages with the link groove and rotates the arm about the fulcrum, is arranged in a direction substantially perpendicular to the link groove. This is achieved by providing a tape drawing mechanism characterized in that the crank plate is disposed at the crank plate and the other end of the crank plate is connected to a drive shaft of a drive source.

(e) Examples of the invention Examples of the invention will be described in detail below with reference to the drawings.

Figures 3 and 4 show one example of the tape pull-out mechanism of the present invention.
These are diagrams for explaining the embodiment, and FIG. 3 shows the positions of the cartridge at the time of mounting and ejecting the cartridge, and FIG. 4 shows the positions at the time of recording and playback.

In the figure, a pair of tape pulling equipment 11 has a tape roller 13 attached to the tip of an arm 12.
Furthermore, a crank plate 1 (described later) is attached to the center of the arm 12.
Further, a fulcrum shaft 15 is provided on the opposite side of the arm 12 from the tape roller 13, so that the tape pull-out device 11 rotates around the fulcrum shaft 15. On the other hand, one end of the crank plate 16 is fixed to the motor rotating shaft 17,
A roller 19 is held on a shaft 18 provided at the other end, and the roller 19 is engaged with the link groove 14 to constitute a driving device for the swinging slider crank mechanism.

From the state shown in Figure 3 with tape cartridge A installed in the cartridge type recording/playback machine, tape 2
0, the tape 20 is initially straight along the cartridge surface as shown, and the tape roller 13 of the tape extractor 11 is in the extractor groove 21. When the crank plate 16 is rotated in the direction of the arrow a by the drive of the motor rotation shaft 17, the tape pull-out device 11 rotates around the fulcrum shaft 15,
The tape 20 is pulled out by the tape roller 13.
Further, a sensor 25 is provided to stop the tape drawing member 11 so that the drawn tape 20 comes into contact with a fixed head 23 via a fixed guide 22 to form a tape path for recording and reproduction.
When the tape pull-out member 11 is detected by the sensor 25, the drive of the crank plate 16 is stopped.
The state shown in FIG. 4 is maintained. Note that P indicates a tape guide inside the cartridge.

Further, if the tape pull-out stop position is set so that the center line 26 of the crank plate 16 and the center line 27 of the tape pull-out member 11 are at right angles as shown in FIG. The tension is T in the figure, and its component forces are T ₁ and T ₂ . The component force T ₁ is on the center line 27 of the tape pull-out member 11 and is perpendicular to the crank plate 16, so it is applied to the crank plate 16. The component force T ₂ tries to apply a rotational force to the crank plate 16 without applying any rotational force, but since the direction is the same as the center line 26 of the crank plate 16, the crank plate 26 does not buckle. As long as you don't wake it up, you can maintain the tape pull-out position.

Also, move the crank plate 16 as shown by arrow b in FIG.
By rotating the tape in the same direction as when pulling out the tape, the tape pulling member can return to its original position in the cartridge A.

Since the motor does not rotate in reverse as described above, the motor control circuit can be easily configured, and even if the motor control circuit is broken and current continues to flow through the motor, the motor will continue to rotate. This prevents the motor from burning out.

It goes without saying that even when the tape pull-out member 11 is restored to its original position in the cartridge and then stopped, the rotation of the crank plate 16 may be stopped using a sensor or the like (not shown).

(f) Effects of the Invention As explained in detail above, the tape pull-out mechanism of the present invention uses a swinging slider crank mechanism that converts the rotational motion of the motor into swinging motion, so that the tape can be pulled out from the cassette in the same rotational direction of the motor. You can pull out the tape and restore the tape to the cassette.Furthermore, even if current continues to flow through the motor, the motor can continue to rotate, which prevents motor burnout and protects the motor. Since there is no reverse rotation, the motor control circuit becomes simpler. In addition, by setting the tape pull-out position to be when the crank plate and arm are perpendicular to each other in the swinging slider crank mechanism, it is possible to eliminate the need for a motor with large reverse torque as in the past.
A large reversing torque can be obtained to keep the tape in the tape pull-out position.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining a conventional tape pull-out mechanism, FIGS. 3 and 4 are diagrams for explaining an embodiment of the tape pull-out mechanism of the present invention, and FIG. Figure 4 shows the respective positions when the cartridge is installed and ejected, and when recording and playing.
The figure shows a state in which the crank plate and the arm plate are connected. In the figure, 11 is a tape pull-out member, 12
is an arm, 13 is a tape roller, 14 is a link groove, 15 is a fulcrum shaft, 16 is a crank plate, 17 is a motor rotation shaft, 18 is a shaft, 19 is a roller, 20 is a tape, 21 is a pull-out groove, 22 is a fixing tape Guide, 23 is a fixed head, 24 is a tape running path, 2
5 is a sensor, 26 is a center line of a crank plate, and 27 is a stop line of a tape pulling member.

Claims (1)

[Claims] 1 Rotating a tape drawer member having a tape roller on an arm around the fulcrum of the arm,
A tape pull-out mechanism for a cartridge-type recording/playback machine that pulls out a tape from a tape cartridge, wherein the arm is provided with a link groove, one end of which is engaged with the link groove, and the arm is rotated about the fulcrum. A tape pull-out mechanism characterized in that a crank plate is arranged in a direction substantially perpendicular to the link groove, and the other end of the crank plate is connected to a drive shaft of a drive source.