JPH0320917Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cassette lid opening/closing device, and in particular is configured to open and close a lid held in a closed lid position and an open lid position using the movement of the cassette descending and rising. An object of the present invention is to provide a cassette lid opening/closing lid device.

The applicant has previously developed a tape cassette that is smaller than a standard tape cassette, an adapter used to attach this small tape cassette to a standard type recording/playback device, and a tape cassette that is smaller than a standard tape cassette. We proposed a small, wearable recording and reproducing device. In order to reduce the size of this tape cassette, its lid mechanism uses a leaf spring (described later) to adjust the lid position and opening position, unlike the conventional structure that incorporates a torsion spring that biases the tape cassette in the closing direction. It has a structure that allows it to be held in position with a click. For this reason,
The lid, which is open when it is installed, does not close when the cassette simply rises and is released from the lid opening member, as in the past, but remains open and the operator can remove it from the cassette and housing. It is necessary to close the lid by hand after use, which is undesirable in terms of operability and tape protection. Therefore, in a cassette having the above-mentioned lid mechanism, a special mechanism for closing the lid in conjunction with the cassette removal operation is required in order to improve operability.

The present invention was developed in response to the above-mentioned needs, and one embodiment thereof will be described below with reference to the drawings.

1 and 2 show the states of a recording and/or reproducing apparatus 1 in a stop mode and a recording/reproducing mode, respectively, to which the cassette lid opening/closing mechanism of the present invention is applied.

This recording/reproducing apparatus 1 is roughly constructed by providing a guide drum 3, a cassette mounting section 4, etc. on a chassis 2, and further providing a tape loading mechanism 6, shown separately in FIG. 3, on the upper and lower surfaces of the chassis. This recording and reproducing apparatus 1 is a dedicated machine for the small cassette 10 shown in FIG. 4, and is smaller than the recording and reproducing apparatus for standard type cassettes.

A small cassette 10 shown in FIG. 4 is attached to this recording/reproducing apparatus 1. As shown in FIG. This small cassette 10
As shown in the figure, the cassette casing 12 is made up of a cassette casing 12 containing a magnetic tape 11, and a lid 13 which is provided on the front side of the cassette casing 12 so as to be openable and closable and which is normally closed. As shown in FIG. 1, the cassette housing 12 includes a small-diameter supply reel 14 and a take-up reel 15.
are placed side by side. The supply reel 14 is exposed through an opening 16 at the bottom of the cassette housing 12. The outer periphery of this lower flange of the take-up reel 15 is the gear part 1.
7, and a portion of this gear portion 17 is exposed through a side window 18 of the cassette housing 12. The magnetic tape 11 is attached to guide poles 19a, 19 on the left and right ends.
b, forming a tape path 11A along the front surface of the cassette housing 12. Furthermore, transparent tape portions (not shown) of a predetermined length are provided at both ends of the magnetic tape 11 to be detected by tape end detection means. This transparent tape portion is detected by a tape end detection device 5 comprising a light emitting source 130 and an end sensor 133 and a start sensor 134 facing thereto. This tape end detection operation is for tape 1
1 forms a loop 11B.

The tape loading mechanism 6 of the recording/reproducing apparatus 1 and related mechanisms will now be described with reference to FIG. 5.

The tape loading mechanism 6 includes timing gears 20, 2
1 rotates, the timing belt 22,
23 is running, loading poles 24, 25
is configured to move along the guide grooves 26, 27 of the chassis 2 from the position shown in FIG. 1 to the loading completion position shown in FIG. 2, and to load the tape into a predetermined tape path.

The timing gears 20 and 21 are superimposed with the main gear 28 in the center, the cam disc 29 at the top, and the angle detection disc 30 at the bottom, so that the main gear 28 corresponds to the horizontal position of the chassis 2, and the gears 20 and 21 correspond to the horizontal position of the chassis 2, respectively. The shaft 31 is rotatably fitted to the shaft 31 in a height relationship in which the lower side and the upper side of the shaft 2 are opposite to each other. Cam board 2
9 and the angle detection board 30 are the main gear 28 and pin 3.
2, and a timing gear 20, 2.
1 is connected to the pin 32 by coil springs 33 and 34, and the cam disk 29, angle detection disk 30, and timing gears 20 and 21 are substantially integrated with the main gear 28, and rotate clockwise during loading and counterclockwise during unloading. It is rotated approximately 360 degrees.

The timing belt 22 is connected to the timing gear 20
and guide rollers 35 to 38, with one end directly connected to the loading pole support 39 and the other end connected to the same support 39 via a coil spring 40.
9 to form a closed loop along the lower surface side of the chassis 2. Another timing belt 23 includes a timing gear 21, a guide roller 41 to
43 and a stop pole 44, one end is directly connected to the loading pole support 45, the other end is connected to the same support 45 via a coil spring 46, and the upper surface of the chassis 2 is They form a closed loop. Support stands 39 and 45
are fitted into guide grooves 26 and 27, respectively, so as to be movable along them.

A substantially spiral cam groove 47 is formed in the cam disc 29. This rotation of the cam disk 29 causes the audio control head 48 and the pinch roller 4 to
9 is moved as described below. Before loading the tape,
As shown in FIG.
The pinch roller 49 is located further back so as not to interfere with the tape loading operation, and the pinch roller 49 is separated from the cassette loading section. The head 48 is mounted on the tip of a support arm 51 that is pivotally supported on a shaft 50. The auxiliary arm 52 is pivotally supported by a pin 54 on the support arm 51, and has a pin 55 at its tip. The pin 55 fits into the cam groove 47. Further, a pin 56 of the auxiliary arm 52 is fitted into an elongated hole of the support arm 51. A torsion spring 57 is provided between the support arm 51 and the auxiliary arm 52, and the spring 57 biases the auxiliary arm 52 in a counterclockwise direction. Also, the bell crank lever 58 is attached to the mounting plate 59.
It is pivotally supported by the upper pin 60, and the pin 61 of the lever 58 fits into the cam groove 47. 62 is a roller that prevents the belt 23 from coming off.

The angle detection board 30 has a reflection plate 6 of a predetermined shape on the bottom surface.
3 is attached. Three light-emitting/light-receiving elements 64, 65, and 66 are fixed on a base facing the reflecting plate 63. The reflecting plate 63 and the elements 64 to 66 cooperate to detect the rotation angle positions of the detection plate 30, that is, the cam plate 29, and the timing gears 20 and 21, and control tape loading operations and the like.

Next, the operation of the recording/reproducing apparatus 1 having the above configuration will be explained.

The small cassette 10 is inserted into the housing 70, moved down, and mounted on the cassette mounting portion 4 as shown in FIG. The lid 13, which is the main part of the present invention, is opened by an opening/closing lid mechanism 71 as shown in FIGS. The gear part 1
7 meshes with the small diameter gear 73a of the tape winding gear body 73. Furthermore, the loading pole 24,2
5. The tension pole 74 and the capstan 75 relatively enter into the front notch of the small cassette 10.

Next, when a recording or playback operation is performed, the loading motor 76 starts, and the belt 77 and worm 7
8, via the worm gear 79 and the drive gear 80,
The timing gears 20, 21, the cam disk 29, and the angle detection disk 30 rotate clockwise (arrow _A1 direction) together with the main gear 28.

Due to the rotation of the timing gears 20 and 21, the timing belts 22 and 23 run in the directions of arrows B and C, and the support stands 39 and 45 move into the guide grooves 26 and 27, respectively.
move along. At this time, poles 24 and 25
The magnetic tape 11 is secured to the cassette 10.
Bring out more. The support stand 39 moves by pushing aside the impedance roller 81, and finally the loading pole 24 is pressed against the stopper 82. The impedance roller 81 and the full-width erasing head 83 are mounted on a rotating support base 85 supported by a pole 84.
Both are positioned by a coil spring 86 and a stopper 87. The support stand 45 moves past the front side of the head 48 which is in the retracted position, and finally the loading pole 25 is pressed and locked to the stopper 88.

Also, due to the rotation of the cam disc 29, the loading pole 25 passes in front of the head 48, and then the pin 5
5 is guided by the cam groove 47 and displaced toward the outer circumference of the cam disc 29. As a result, the support arm 51 and the auxiliary arm 52 rotate together in the clockwise direction, and the head 48 approaches the magnetic tape 11 drawn out of the small cassette 10 and attaches thereto. Eventually, as shown in FIG. 2, the auxiliary arm 52 rotates independently of the support arm 51, and the support arm
1 is biased clockwise by the spring force of the torsion spring 57 and presses against the stop pole 44, and the head 48 is positioned.

Further, due to the rotation of the cam disk 29, the lever 58 rotates the pin 61 counterclockwise with the pin 61 guided by the cam groove 47, and the pinch roller support arm 92 is rotated counterclockwise about the shaft 93 via the connecting levers 90, 91. The pinch roller 49 rotates clockwise and the capstan 7
Crimp to 5. The pressing force of the pinch roller 49 against the capstan 75 is obtained by the spring force of the coil spring 94 between the levers 90 and 91.

Further, due to the rotation of the support arm 51, the L-shaped lever 101 is moved to the shaft 102 via the lever 100.
The string 103 is loosened, and the L-shaped lever 104 is rotated clockwise by the spring 105. The string 103 is guided by guide rollers 106 and is mounted at right angles along the periphery of the device, and is connected to the lever 101 and the L-shaped lever 104.
are connected. As the lever 104 rotates, the tension arm 107 is rotated counterclockwise about the shaft 109 by the spring 108, the tension pole 74 reaches the operating position, and the brake band 110 is tensioned.

As a result, the recording/reproducing apparatus 1 enters the state shown in FIG. 2, and the magnetic tape 11 pulled out from the supply reel 14 is attached to the fixed guide pole 111, the tension pole 74, and the full-width erasing head 83, and then the impedance roller Attached to 81. The magnetic tape 11 is further helically attached between poles 24 and 25 to the circumferential surface of a guide drum 3 having a rotating video head. Tape 11 is guide drum 3
A rotating video head records or reproduces video signals while traveling along the vehicle.

Tape 11 released from attachment to guide drum 3
is attached to the audio control head 48, guided by the guide pole 112, driven by the pinch roller 49 and the capstan 75, enters the cassette 10, and is taken up on the take-up reel 15. Capstan 75 is rotated by capstan motor 113.

In addition, as the reel drive motor 120 on the lower side of the cassette mounting section 4 rotates clockwise, the oscillating idler 121 that is in pressure contact with the rotating shaft 120a is rotated clockwise.
moves by rolling on the idler movement assisting plate 122 and comes into pressure contact with the intermediate gear 123 meshing with the large diameter gear 73b of the gear body 73. As a result, the rotation of the motor 120 is controlled by the idler 121 and the intermediate gear 12.
3. It is transmitted to the take-up reel 15 via the gear body 73, which rotates clockwise to wind up the tape.

Further, the plunger solenoid 125 is energized and the sliding plate 126 moves to the left. As a result, the brake shoes 127 and 128 are separated from the supply reel stand 72 and the gear body 73, respectively, and the braking is released.

When a stop operation is performed during the recording/reproduction mode, each mechanism that operated during the tape loading operation operates in the reverse direction in the reverse order to the loading operation, and an unloading operation is performed.

Further, in FIG. 4, the lid 13 is rotatably attached to the cassette housing 12 by a pin 140.
The pressing piece 141 is once pushed away by the corner 13b of the bent portion 13a, and rotated between the closed lid position shown by the two-dot chain line and the opened lid position shown by the solid line. The pressing piece 141 is slidably provided in a groove in the side wall of the cassette housing 12, and its rear end is biased in the direction of the arrow by a U-shaped leaf spring 142. When the lid 13 is rotated to the vicinity of the closed position, it is automatically rotated to the closed position by the action of the pressing piece 141, and the one side wall 13c of the bent portion 13a is pressed by the pressing piece 141 to close the lid. Clicks into position. Similarly, when the lid 13 is rotated close to the opening position, it is automatically rotated to the opening position by the action of the pressing piece 141, and another side wall 13d of the bent portion 13a is pressed by the pressing piece 141. Clicks into open position. Here, the pressing piece 141 and the U-shaped leaf spring 142 are both incorporated within the thickness of the side wall of the cassette housing 12, and the cassette 10 becomes smaller accordingly.

Next, the opening/closing lid mechanism 71, which is a main part of the present invention, will be explained with reference to FIGS. 6 to 9.

6 and 7 show the states of the opening/closing lid mechanism 71 before and after opening the lid, respectively. Opening/closing lid mechanism 71
is disposed at the front left side of the cassette mounting section 4, and includes a U-shaped bracket 150 fixed on the chassis 2, and a lid opening lever 15 provided on the bracket 150.
1 and a closing rod 152.

The lid opening mechanism 71A consists of one vertical plate 150a of a U-shaped bracket 150 and a lid opening lever 151 pivotally supported by a shaft 153. Lid opening lever 15
1 is urged to rotate clockwise by a strong coil spring 154, and normally comes into contact with a stop pin 155 and is inclined as shown in FIGS. 6 and 8A. Moreover, this lever 151 has a tip portion 151a.
A cassette housing 1 of a small cassette 10 to which a small cassette 10 is attached
It is arranged so as to face the notch 12a of No. 2. This lever tip 151a is attached to the small cassette 1.
0 is attached to the attachment portion 4, the cutout portion 12
a and is pushed down by the top plate 12b of the cassette housing 12 at the final stage of installation.
The coil spring 154 does not stretch while the lid 13 moves along the upper end surface 151b of the lever 151, but has such strength that it stretches when the tip 151a is locked by the top plate 12b and pushed down. That is, at the final stage of mounting the small cassette 10, the lever 151 rotates counterclockwise against the coil spring 154, and the tip 151a escapes downward, thereby allowing the small cassette 10 to move downward to the final position. , is mounted on the mounting section 4.

Further, the upper end surface 151b of the lever 151 and the upper end surface 151a1 of the vertical plate _150a function to pry open the lid 13 of the small cassette 10 in conjunction with the mounting operation, as shown in FIGS. 6 and 8A. In this state, the inclined upper end surface 151b and the upper end surface _151a1 are bent and continuous in a side view.

The lid closing mechanism 71B is connected to another vertical plate 15 of the U-shaped bracket 150 (on the outside of the cassette attachment part).
0b, and a closing rod 152 that is implanted therein and extends horizontally. This rod 152 is
In the side view, the lever 151 is located above the lever 151 (at a height corresponding to the top plate 156 of the recording/reproducing apparatus 1), and in the plan view, the lever 151 is located at a position opposite to the right end portion of the open lid 13 of the mounted cassette 10. When the small cassette 10 is removed from the mounting part 4 and moves upward, the lid 13 is locked and pushed relatively to rotate in the closing direction.

Next, the opening/closing operation of the cassette lid by the opening/closing lid mechanism 71 will be explained.

Here, the housing 70 is attached to a pop-up mechanism (not shown), and by pushing down the housing 70 into which the small cassette 10 is inserted, the small cassette 10 moves downward in a slight arc and is attached to the mounting section 4. By performing the eject operation, the small cassette 10 rises and is removed from the mounting section 4.

In connection with loading the cassette, the lid 13 is opened as shown in FIGS. 8A-E. First, when the housing 70 into which the cassette 10 with the lid 13 closed is pushed down, the tip (lower end) portion 13e of the lid 13 comes into contact with the inclined upper end surface 151b of the lever 151, as shown in FIG. The lid 13 is guided by this inclined end surface 151b and is pried open as shown in FIG. When pushed down further, the lid 13 moves from the upper end surface 151b to the vertical plate 1 as shown in FIG.
It is smoothly transferred to and guided by the upper end surface _150a1 of 50a, and then further opened and enters the lower side without hitting the rod 152. If you press down further,
As shown in FIG. D, the top plate 12b has a notch 12a.
The coil spring 15 presses against the lever tip 151a that has entered the lever 151.
4, the cassette 10 is lowered to its final position and is mounted on the mounting portion 4 as shown in FIGS. 2, 7 and 8E.
At this time, the lever 151 is in a rotating state with the upper end surface 151b being horizontal, and the lid 13 is rotated a little further than the state shown in FIG.
42, it is rotated to the horizontal position and held in that position by the action of the rod 152, and is located above the upper end surface 151b of the vertical plate 150b and at a position below the rod 152.
It goes under 6.

When the small cassette 10 is raised from the mounting section 4 by the eject operation, the open lid 13 is closed as shown in FIGS. 9A to 9C. First, when the cassette 10 rises together with the housing 70 with the lid 13 open, the lid 13 comes into contact with the rod 152 and is prevented from rising with the lid open, as shown in FIGS. 9A and 9B. 13 is relatively pushed (guided) by the rod 152 in conjunction with the subsequent rise of the cassette housing 12 and rotates in the closing direction against the leaf spring 142. When the cassette case 12 further rises, the lid 13 rotates to a position where it can be clicked to the closed position by the action of the leaf spring 142 and the pressing piece 141. As shown by the chain line, it moves away from the rod 152 and independently rotates in the closing direction regardless of the rise of the cassette housing 12, and is held in the closed position by a click. As a result, when the housing 70 has finished rising, the lid 13 of the small cassette 10 is in a completely closed state, as shown in FIG. 9C.

Therefore, the small cassette 10 is pulled out from the housing 70 with the lid 13 closed, which is convenient for protecting the tape, and improves operability since there is no need to close the lid 13 by hand after pulling it out. do. In addition, since the lid 13 closes in conjunction with the upward movement of the housing 70, it is closed at the beginning of the cassette removal operation, and when the cassette 10 is removed from the inside of the recording/reproducing apparatus 1, the lid 13 is closed and the inside of the cassette 10 is closed. The magnetic tape 11 is no longer exposed to the outside, and the tape is best protected. Furthermore, since the lid 13 of the small cassette 10 is already closed before it is pulled out, the small cassette 10 can be pulled out from the housing 70 smoothly. Further, the front surface of the lid 13 will be pressed against the rod 152 when the lid is closed, but since this position is located away from the pin 140, the pressing force will be small, and the lid 13 will be pressed against the rod 152. Since it hits the circumferential surface of the column, there are almost no scratches.

It is also conceivable to close the lid 13 that is open in connection with the operation of pulling out the cassette 10 from the housing 70, but in this case, if the housing 70 remains raised, the tape 11 will remain exposed to the outside. This is not desirable in terms of protecting the tape, and it also makes it difficult to pull out the cassette, and the lid 13 is pushed at a position very close to the pin 140, which makes the operation to pull out the cassette even more difficult and can seriously damage the cassette. This will cause damage and is not practical.

Also, due to the rise of the housing 70, the lever 15
1 is rotated clockwise to the original position as shown in FIG. 9C, and the lid opening mechanism 71A is in the state shown in FIG. 6.

In addition, the opening mechanism 71A and the closing mechanism 71B are integrally provided, requiring a small installation space.
Moreover, it becomes possible to mount with high precision.

As described above, the cassette lid opening/closing lid device of the present invention has a cassette casing having a top plate, a rotation fulcrum is provided at a position close to the front of the casing, and a lid covering the front of the casing is provided. , the above-mentioned attachment mechanism that rotates in a click-like manner between an open lid position and a closed lid position, and lowers and raises the type of cassette held in each position together with a housing to be attached to and detached from the attachment portion. A cassette lid opening/closing lid device for opening and closing a lid, which is rotatably supported on a fixed member and has an inclined portion that comes into contact with the lid when the cassette is lowered, and the lid is initially opened along this inclined portion. The first step is to
a spring stretched over one end of the first opening lid; a locking member provided on the fixing member to prevent rotation beyond a predetermined angle due to the tension of the spring; a second lid opening part having a shape that is more horizontal than the inclined part of the first lid opening part that contacts the lid and further opens the lid after the first lid opening by the first lid opening part; The opening lid is configured such that the inclined part of the first opening part comes into contact with the top plate of the cassette housing and can be moved down against the tension of the spring before the cassette finishes lowering. and a device, which is provided opposite to the lid at a height lower than the raised position of the cassette, and when the cassette is raised, is located on the upward locus of the opening lid of the cassette and comes into contact with the opening lid to close the lid. Since the structure is equipped with a lid-closing device, even if the cassette has a short horizontal dimension between the rotation fulcrum of the lid and the point of application of the lid-opening force, the moment in the lid-opening direction can be effectively applied. This allows for smooth opening of the lid.

Further, the lid is provided opposite to the lid at a height lower than the raised position of the cassette, and when the cassette is raised, the lid is located on the upward locus of the opening lid of the cassette and comes into contact with the opening lid to close the lid. Since the structure is equipped with a lid device, it can be made thinner than a structure in which the closing lid member is placed higher than the cassette's rising position, and furthermore, the lid closes while the cassette is rising. , the tape can be effectively protected.

And, since the first lid opening part is rotatable,
The cassette case can be brought to a predetermined position without any hindrance, and in conjunction with this, the lid can be rotated to the fully open position.In particular, the pivot point is located close to the front of the case. This is suitable for a cassette which has a lid that is difficult to open and has a lid that covers the front part of the casing, and is held at each position by being rotated in a click-like manner between an open lid position and a closed lid position.

In addition, since the second lid opening part is configured to further open the lid by contacting the lid in the initial opening state by the first lid opening part, the shape of the second lid opening part is Since the inclined part of the first lid opening part is in a state that is closer to horizontal, the lid can be opened smoothly, and the opening angle of the lid relative to the amount of downward movement of the cassette can be increased, allowing the lid to be opened more efficiently. The effect is that it can be opened to

[Brief explanation of the drawing]

FIGS. 1 and 2 respectively show the state of a recording and reproducing apparatus to which an embodiment of the cassette lid opening/closing lid device of the present invention is applied, before loading a tape, and in the recording and reproducing mode after tape loading is completed. FIG. 3 is a perspective view showing the tape loading mechanism taken out from FIG. The figure is an exploded perspective view of the structure of the timing gear part in Figure 3, and Figures 6 and 7 are taken out of the cassette lid closing device (opening/closing device) in Figures 1 and 2, respectively. Figures 8A to 8E are diagrams illustrating the opening operation when the cassette is installed, and Figures 9A to C are perspective views showing the states before and after the cassette is installed. FIG. 4 is a diagram illustrating a lid closing operation using the cassette lifting movement of the cassette lid closing mechanism in the figure. 1...Recording/reproducing device, 3...Guide drum, 4
...cassette mounting section, 5...tape end detection means,
6...Tape loading mechanism, 10...Small cassette,
11...Magnetic tape, 12...Cassette housing, 1
2a... Notch, 12b... Top plate, 13... Lid,
13a...Bent part, 13b...Corner part, 13c, 1
3d... Side wall part, 13e... Lower end part, 14... Supply side reel, 15... Winding side reel, 20, 21
...Timing gear, 22, 23...Timing belt, 24, 25...Loading pole, 2
6, 27... Guide groove, 28... Main gear, 2
9...Cam disk, 30...Angle detection plate, 47...Cam groove, 48...Audio control head, 49...Pinch roller, 70...Housing, 71...Opening/closing lid mechanism (cassette lid opening/closing device) ), 71A...lid opening mechanism, 71B...lid closing mechanism,
75... Capstan, 76... Loading motor, 83... Full width erase head, 140... Pin, 141... Pressing piece, 142... U-shaped leaf spring, 150... U-shaped bracket, 150a, 1
50b... Vertical plate, 150a ₁ ... Upper end surface, 15
1... Lid opening lever, 151a... Tip, 15
1b...Upper end surface, 152, 162...Closing rod, 153...Shaft, 154...Coil spring, 1
55...Stop pin, 156...Top plate.

Claims (1)

[Claims for Utility Model Registration] In a cassette casing having a top plate, a pivot point is provided near the front of the casing, and a lid that covers the front of the casing is arranged in a position where the lid is open and when the lid is closed. a cassette lid that opens and closes the lid in conjunction with a mounting mechanism that rotates in a click-like manner between positions and lowers and raises the cassette with a housing that accommodates the type of cassette held at each position to attach and detach the lid to and from the mounting section; The opening/closing lid device is rotatably supported by a fixed member, and has an inclined portion that comes into contact with the lid when the cassette is lowered, and a first opening lid that performs initial opening along this inclined portion. a spring tensioned at one end of the first opening lid part; a locking member provided on the fixing member to prevent rotation beyond a predetermined angle due to the tension of the spring; After the initial lid opening by the lid opening section, the first lid contacts the lid and further opens the lid.
and a second opening part having a shape that is more horizontal than the inclined part of the opening part, and before the cassette finishes lowering, the inclined part of the first opening part touches the top of the cassette case. a lid opening device configured to abut within a plate and be moved downward against the tension of the spring; and a lid opening device provided opposite to the lid at a height lower than the raised position of the cassette, when the cassette is raised; A cassette lid opening/closing device comprising: a lid closing device positioned on the upward trajectory of the opening lid of the cassette and abutting the opening lid to close the lid.