JPS596538Y2 - Automatic stop device in cassette box - Google Patents

Description

[Detailed description of the invention] This invention is an automatic stop device in a cassette box, and more specifically, the box rotates downward when a cassette is inserted, and the tape is automatically fed. This invention relates to an automatic stop device that rotates a box upward to eject a cassette and automatically stops its operation.

Generally, when a cassette tape reaches its end, the pinch roller and capstan spin idly, causing undue force to be applied to the tape.

For this purpose, it was thought that the tape tension or other electrical signal at the end of the process would be detected and a microswitch or relay would be activated to activate the motor power supply or solenoid to automatically stop the operation. The pinch roller was still in pressure contact with the tape and capstan, which caused the pinch roller to deform and cause wow and flutter.

Further, it is cumbersome to manually eject the cassette each time the tape ends.

The present invention eliminates this drawback by operating the operating lever provided on the control plate to the position where it engages with the flywheel at the end of the tape, and using the force of the flywheel to operate the control plate. , the cassette is ejected.

An embodiment of the present invention will be described in detail below with reference to the drawings.

The rear sides of a box 3 for inserting a cassette 2, which is released from both front and rear ends, are pivotally supported by shafts 4 and 5 on upper new curved parts 1a and lb provided on both sides of the board 1 so as to be able to move up and down.

A locking pawl 6 that engages with the lower front surface of the box 3 is pivotally mounted on the board 1 via a shaft 7. The upper end of the locking pawl 6 is opposed to the front surface of the cassette 2, and the pawl 6 is supported by a spring 8. It is made to bounce in the direction in which it engages with the box 3, that is, in the counterclockwise direction in FIG.

A pin 3a is installed on the front right side of the box 3, and the crank arm 1 is connected to the bearing 1C and the shaft 9 that stand up from the base plate 1.
The pin 3a is connected to a notch 10 provided in one arm 10a of the crank arm 10.
b.

As shown in FIG. 3, a control plate 13 is provided on the substrate 1 with a pair of pins 11, 11 and elongated holes 12, 12 so as to slide back and forth, and a pin 14 implanted on the lower surface of the control plate 13 is provided on the substrate 1. The spring 15 under the base plate 1 is hung to repel the control plate 13 backward.

A hook 17 is formed on the right edge of the control plate 13 to hook the pin 16 implanted in the other arm 10C of the crank arm 10 from the rear, and also engages the stopper pin 1g implanted in the arm 10C from the front. Form the upper bent portion 1B that will fit.

On the base plate 1 are a capstan 22 and a clutch shaft 2 that protrude into the cassette 2 inside the box 3 through a notch 20 and a circular hole 21 in its bottom surface when the box 3 rotates downward.
3 is provided, and the capstan 22 and clutch shaft 23 are connected to a pulley 24, a belt 25, and a pulley 26 for conduction. A flywheel 27 is fixed to the lower side of the capstan 22 than the base plate 1, and this flywheel 27 is connected to the belt. (not shown) to a motor shaft (not shown).

As shown in the first figure, a sliding plate 33 is provided on the substrate 1 to be moved laterally by a pair of pins 11, 40 and long holes 31, 31, and a crank-shaped groove 34 provided in the sliding plate 33 is provided. A roller 36 having a shaft 35 pivotally connected to the control plate 13 is fitted so that when the control plate 13 moves forward, the sliding plate 33 moves to the left. A head 38 and a pinch roller 39 are provided which contact the tape 37 in the cassette 2 inside the box 3 from the right side when it moves to the left.

Note that the above portions are the same as those of the conventional device, so detailed explanation thereof will be omitted.

Next, a tape tension detection mechanism and an automatic force setting/ejection device, which are the gist of the present invention, will be explained.

One end of a lever 41 is pivotally attached to a shaft 40 implanted in the base plate 1, and the lever 41 and the sliding plate 33 are connected by a spring 42.

The tip of this lever 41 is pivotally connected to a shaft 44 at the center of a detection lever 43, and one end of a detection arm 45 is connected to the rear end of this detection lever 43 by a shaft 46, and this detection arm 45 is connected to a sliding plate. The upper end bent portion 33 provided on the left side edge of 33
The tape 37 is inserted through the guide hole 37a so as to come into contact with a position 37a between the tape 37 and the head.

The front part of an actuation lever 50 is pivotally attached to the control plate 13 by a shaft 51, and a pin 52 that engages with the front left edge of the detection lever 43 is implanted on this actuation lever 50. A spring 54 is stretched between the fulcrum 53 and the fulcrum 53 provided on the control plate 13, and the actuating lever 50 is resiliently rotated counterclockwise in FIGS. 1 and 3.

As shown in FIG. 3, the rear end of the operating lever 50 is bent downward, and the bent portion 50a projects downward through the hole 1d provided in the base plate 1. A roller 55, which engages with the bent portion 50a of the lever 50 when it rotates clockwise, is pivotally mounted by a shaft 56.

Next, the operation of this device will be explained.

In a normal state without the cassette 2, the box 3 is in an upwardly rotated position as shown in the second figure, and a locking pawl 6 is engaged with the lower front surface of the box 3.

Further, the control plate 13 is deflected forward against the elasticity of the spring 15, and its upper bent portion 18 engages with a stopper pin 19.

Then, insert the cassette 2 from the rear side of the box 3 as shown by the arrow a in FIG. 2 and press it forward.

When the cassette 2 is thus fully inserted into the box 3, its front surface operates the claw 6 forward as indicated by arrow b in FIG. 2 to disengage it from the box 3.

As a result, the box 3 rotates downward as shown in the fourth figure, and the capstan 22 and clutch shaft 23 enter the cassette 2 through the notch 20 and circular hole 21 on the bottom surface of the box 3, and the capstan 22 and the clutch shaft 23 enter the cassette 2 behind the tape 37 and the take-up reel. Insert into the center hole,
engage.

On the other hand, when the box 3 rotates downward, the arm 10a, crank arm 10, and arm IOC rotate clockwise as shown by arrow C in FIG. is removed from the upper bent portion 18.

As a result, the elasticity of the spring 15 causes the control plate 13 to move rearward as shown by arrow d in FIG.

Thus, when the roller 36 reaches the bent portion 34a of the groove 34, the sliding plate 33 slides to the left (upward in FIG. 1), and as shown in FIG. The roller 39 comes into contact with the tape 37 of the cassette 2, and the tip of the detection arm 45 comes into contact with a position 37a between the tape 37 reel and the head.

In this state, the tape 37 is fed by the pinch roller 39 and the capstan 22, and the recording is played back by the head 3B.

Thus, when all the tapes 37 of the cassette 2 have been fed and it is time to finish, tension is applied to the portion 37H between the feed reel and the head, and the tip of the detection arm 45 is pushed to the right as shown by arrow e in FIG. .

As a result, the detection lever 43 is rotated counterclockwise as shown by the arrow f in FIG. It rotates against the elasticity of the spring 54.

As a result, the bent portion 50a is connected to the flywheel 27.
into the circular trajectory h of the roller 55.

When the roller 55 engages with the bent portion 50a due to the rotation of the flywheel 27, the control plate 13 is moved in the direction of the arrow i against the elasticity of the spring 15 via the shaft 51 of the operating lever 50.
is pushed forward as shown in .

As a result, the sliding plate 33 first moves to the right due to the engagement of the roller 36 and the groove 34, and the head 38 pinch roller 3
9 and the detection arm 45 escape from the box 3.

Next, the hook 17 of the control plate 13 presses the pin 16 forward, and the arm 10C, crank arm 10, and arm 10a
In the figure, the notch 10b pin 3 is rotated counterclockwise.
The box 3 is rotated upward via the arrow a and returns to the state shown in the second figure, and the cassette 2 is automatically ejected.

At this time, the claw 6 engages with the lower front surface of the box 3 due to the elasticity of the spring 8, and the upper bent portion 1B of the control plate 13 engages with the stopper pin 19 and is held in this state.

As described above, according to the present invention, the cassette is automatically ejected when the tape ends, which is convenient and prevents deformation of the pinch roller. The head is moved to the position where it engages with the flywheel, and the sliding plate is moved to the position where it engages with the flywheel.
As the pinch roller is removed from the tape on the cassette, the hook on the control plate rotates the box upward via the crank arm, and the force of the flywheel is used to operate the control plate and eject the cassette, so the structure Since it is simple and reliable in operation, and all parts can be constructed by press punching, it is suitable for mass production and can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an outline of an embodiment of the present invention, Fig. 2 is a side view of the box in the raised state, Fig. 3 is a plan view of the control panel, and Fig. 4 is the box lowered. FIG. 2... Kasetsu I, 3... Box,
13... Control board, 37... Tape, 2
7... Flywheel, 45... Detection arm, 50... Actuation lever, 50a, 56...
...Engagement part.

Claims (1)

[Scope of utility model registration request] One end of a cassette insertion box is pivotally supported on the board for vertical movement, the other end of the box engages with one end of the crank arm, and a control plate is provided on the board for sliding back and forth,
The control plate has a hook shape that engages with the other end of the crank arm, and a sliding plate that moves left and right in conjunction with the back and forth movement of the control plate is provided with a head and a pinch roller that contact the tape of the cassette, The detection lever is provided with a detection arm that detects the tension of the tape, and the control plate is pivoted with an operating lever that operates at a position where it engages with the flywheel in relation to the operation of the detection lever. The tension of the detection arm operates the operating lever via the detection lever to a position where it engages with the flywheel, and the flywheel slides the control plate via this operating lever, actuating the sliding plate to move the head, An automatic stop device for a cassette box, characterized in that the pinch roller is removed from the tape of the cassette, and the hook of the control plate rotates the box upward via a crank arm to eject the cassette.