JPH1092067A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the controlling and the detecting of an ejection by performing the push-in operation of a tape cassette by detecting the rotational angle of a main cam converting the operation mode of a device. SOLUTION: In the state shown in the figure, one part of a tape cassette 1 is projected from a VTR 2, the loading/unloading of the cassette 1 is possible from the VTR 2. In order to load the tape cassette 1 in the prescribed position of the VTR 2, at first, the projected part of the tape cassette 1 is pushed into the inside direction (the direction of the arrow C) of the VTR2. Then, since the rotor of a mode switch 3 is similarly rotated by 8 deg. and electric conductions between terminal 41 and 42, terminal 41 and terminal 43 and terminal 41 and terminal 44 are all extinguished, it can be detected that the tape cassette 1 is pushed in.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder including a tape cassette mounting mechanism for inserting a tape cassette containing a magnetic tape from outside the apparatus and mounting the tape cassette at a predetermined position in the apparatus. Things.

[0002]

2. Description of the Related Art Recently, video tape recorders (hereinafter referred to as V
TR) or digital audio tape recorder (D
AT, etc., there is a strong demand for improved performance, lower cost, lower power consumption, and the like. Accordingly, a magnetic recording / reproducing apparatus including a tape cassette mounting mechanism has also been required to improve response, reduce component costs, and reduce power consumption in a standby state.

Hereinafter, a conventional magnetic recording / reproducing apparatus will be described. FIG. 7 is a plan view of a conventional magnetic recording / reproducing apparatus, showing a state where a part of a tape cassette 101 is projected outside a VTR 102 as a magnetic recording / reproducing apparatus (hereinafter, referred to as an eject state), and FIG. 7 is a right side view of FIG.

The VTR 102 includes a slot-in 103 as a tape cassette mounting mechanism, a main cam gear 104 as a cylindrical member that controls the operation of the slot-in 103 by being driven to rotate, and a speed reduction mechanism 105 that drives the main cam gear 104 to rotate. A mode switch 106 as an operation mode detector for detecting an operation mode of the VTR 102 by engaging a shaft of the main cam gear 104 and detecting a rotation angle of the main cam gear 104; At the time of rewinding, it is composed of a tape leading end detecting device 107 provided near the tape leading end for detecting a transparent leader tape, and a chassis 108 to which these are attached.

The slot-in 103 holds the tape cassette 101, engages with the cassette holder 109 having a plurality of guide pins, and controls the movement of the cassette holder 109 and the posture during the movement. Plate 110 having a plurality of guide grooves
S, 110T, a wiper arm 111S having a groove (not shown) engaging with a guide pin passing through the side plate 110S, a wiper arm 111T having a groove 112T engaging a guide pin passing through the side plate 110T, and a gear 113. , Wiper arm 111S,
111T are fixed in phase with each other, and the side plate 1
A synchronous shaft 114 rotatably attached to the chassis 108 by 10S and 110T;
A drive rack 118 having a first cutout 116, a second cutout 117, and a rack 115 that is linearly slidably mounted at its ends and meshes with the gear 113 of the wiper arm 111T; A drive plate 120, which is slidably mounted linearly and has an engagement pin 119 at an end, a drive rack 118 and a drive plate 12;
0, an insertion spring 121 stretched between the
And a drive arm 125 rotatably attached to the chassis 108 having a long hole 122 loosely fitted into the engagement pin 119, a cam follower 123, and a rotation shaft 124 fitted into a hole in the chassis 108. Have been.

The main cam gear 104 has a gear 126 on its outer periphery that meshes with the speed reduction mechanism 105, a groove cam 127 that fits loosely on the cam follower 123 of the drive arm 125, and a key-shaped part at the end that fits into a hole in the chassis 108. Shaft 128
It is composed of

The speed reduction mechanism 105 is controlled by a control circuit (not shown), a loading motor 129 capable of rotating forward and reverse, a worm gear 130 having a small advance angle, and a worm wheel meshing with the worm gear 130, the worm gear 130 having a self-lock mounted on its output shaft. A gear 131, a first reduction gear 133 formed of a gear 132 integrally formed coaxially with the worm wheel gear 131, a gear 134 meshing with the gear 132, and a gear 126 formed on the outer peripheral portion of the main cam gear 104. The gear 135 is constituted by a second reduction gear 136 formed coaxially and integrally, and the driving force of the loading motor 129 is adjusted at a predetermined reduction ratio to the main cam gear 10.
4 is transmitted.

[0008] The mode switch 106 is fitted to a key-shaped portion of the shaft 128 of the main cam gear 104 to rotate the rotor 137 at the same angle as the rotation angle of the main cam gear 104.
And a main body 138 to which the rotor 137 is rotatably attached and has a plurality of terminals.
7, the presence or absence of conduction between the terminals is sequentially switched according to the rotation angle of 7, so that the rotation angle of the rotor 137 can be detected.

The tape start detecting device 107 includes a light emitting diode (hereinafter, referred to as an LED) 139 and a slot-in 103.
And a phototransistor 140 disposed outside the side plate 110T.

The operation of the conventional magnetic recording / reproducing apparatus configured as described above will be described below. First, the cassette loading operation of pulling the tape cassette 101 into the VTR 102 and fixing it at a predetermined position will be described.

In the state shown in FIG. 7, it is detected from the rotation angle of the main cam gear 104 and the mode switch 106 that the VTR 102 is in the eject state. In the eject state, the drive rack 118 is connected to the optical path from the LED 139 of the tape start detecting device 107 to the phototransistor 140.
Of the LED 139 is not interrupted in the optical path, and the light of the blinking LED 139 is received by the phototransistor 140.

In this state, when the tape cassette 101 protruding from the VTR 102 is pushed in the direction of the arrow P, the cassette holder 109 also moves in the direction of the arrow P, and the wiper arms 111S and 111T engaged with the guide pins move in the directions of the arrow R. Rotate in the direction. (FIG. 8) The drive rack 118 moves in the direction of the arrow T because the rack 115 is engaged with the gear 113 of the wiper arm 111T.

On the other hand, the speed reducing mechanism 105 is
The self-lock of 0 prevents rotation from the main cam gear 104 side, so that the drive arm 125 does not rotate and the drive plate 120 does not move. Here, when the tape cassette 101 is pushed in the direction of arrow P with a predetermined force or more, the insertion spring 121 stretched between the drive rack 118 and the drive plate 120 is extended, and only the drive rack 118 moves in the direction of arrow T. Then, the first notch 116 also moves, interrupts the optical path of the tape leading end detecting device 107, and detects that the tape cassette has been pushed in because the phototransistor 140 cannot receive light.

After the detection, the loading motor 129 is rotated, the main cam gear 104 is rotated in the direction of the arrow V via the first reduction gear 133 and the second reduction gear 136, and the drive arm 125 is actuated by the action of the groove cam 127 and the cam follower 123. Is rotated in the direction of arrow X, and the driving plate 120 is moved in the direction of arrow T. At this time, since the drive rack 118 can be moved integrally with the drive plate 120, the gear 113 meshing with the rack 115 is rotated, and the wiper arm 111 is rotated.
S, 111T are rotated in the direction of arrow R (FIG. 8), the cassette holder 109 holding the tape cassette 101 is moved in a predetermined posture along the guide grooves of the side plates 110S, 110T, and the tape cassette 101 is moved to the VTR 10
The cassette can be fixed at a predetermined position in the cassette 2 and brought into a cassette down state.

In this state, since the second cutout 117 of the drive rack 118 has moved to a position coinciding with the optical path of the tape start detecting device 107, the start of the tape can be detected when the tape is rewound.

Next, the cassette ejecting operation of the tape cassette 101 will be described. Loading motor 12
By rotating the cassette 9 in a direction opposite to the cassette loading operation, the operation mode of the VTR 102 can be shifted from a predetermined operation mode to a cassette down state and an eject state.

By rotating the main cam gear 5 in the direction of arrow W from the cassette down state, the groove cam 127 is rotated.
By rotating the drive arm 125 in the direction of the arrow Y by the action of the cam follower 123 and the cam follower 123, the drive plate 120 and the drive rack 118 are integrally moved in the direction of the arrow U, and the gear 113 meshing with the rack 115 is rotated. 111
S, 111T are rotated in the direction of arrow S, and the cassette holder 109 holding the tape cassette 101 is moved to the eject state.

During this movement, the mode switch 106 detects the ejection state of the operation mode of the VTR 102,
In addition, the drive rack 1
The first notch 18 coincides, the light of the LED 139 reaches the phototransistor 140, and the loading motor 129 is stopped upon detecting that the drive rack 118 has reached the eject position.

However, due to the inertia of the slot-in 103 during operation and the loading motor 129 during rotation, it cannot be stopped immediately, and the guide pin of the cassette holder 109 hits the end of the guide groove of the side plate 110S, 110T. Stop by touching.

[0020]

However, in the above-described conventional configuration, when the VTR is in the eject state, the press-down of the tape cassette is detected by the phototransistor 140 being unable to receive light, and the tape can be detected at any time. It is necessary to keep the start-end detection LED on at all times. Especially in the latest VTR, if the tape cassette is pushed in even if the power of the device is turned off, the power is turned on and the loading operation of the tape cassette is started. In such a case, the lighting time of the LED becomes longer, and the life of the LED becomes a problem.

[0021] Also, in the control of the VTR,
Considering the service life of the cassette, complicated control of blinking at a predetermined interval is required during cassette ejection, and the blinking of the LED delays the detection of the insertion of the tape cassette and delays the subsequent operation. Had.

The present invention solves the above-mentioned conventional problems. A low-cost LED can be used, the tape cassette can be pushed in and the ejection can be detected with simple control, and
It is an object of the present invention to provide a magnetic recording / reproducing apparatus having a good response after pushing a tape cassette.

[0023]

In order to achieve this object, a magnetic recording / reproducing apparatus according to the present invention performs a pushing operation of a tape cassette by detecting a rotation angle of a main cam for converting an operation mode of the apparatus. have.

With this configuration, it is possible to reduce the cost of the LED, press the tape cassette, simplify the ejection detection control, and obtain a good response operation after the tape cassette is pressed.

[0025]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention has at least three rotation angles, a first angle, a second angle,
A cylindrical member having a cam-shaped portion capable of controlling the operation of a mechanism in the device according to the operation mode of the device by changing the rotation angle to a third angle; and a second angle from at least a first angle of the cylindrical member. And an operation mode detector capable of detecting that the rotation angle of the cylindrical member has reached the third angle, and when the rotation angle of the cylindrical member is the first angle, a part of the tape cassette is projected out of the apparatus. Moving the tape cassette to a first position where it can be attached and detached from outside the device,
When the protrusion of the tape cassette is pushed into the apparatus, the cylindrical member rotates to a second angle. When the rotation angle of the cylindrical member is a third angle, the tape cassette is moved to a predetermined position in the apparatus. A magnetic recording / reproducing apparatus having a tape cassette mounting mechanism capable of holding a magnetic recording medium in the tape cassette at a second position at which a signal can be recorded / reproduced. The cylindrical member has a function of changing a rotation angle from a first angle to a second angle, and the change can be detected by the operation mode detector.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a plan view of a magnetic recording / reproducing apparatus according to the present invention, in which a part of a tape cassette 1 is projected outside a VTR 2 as a magnetic recording / reproducing apparatus (hereinafter referred to as an ejected state). FIG. 2 is a right side view of FIG. 1, FIG.
FIG. 3 is a sectional view showing an AA section in FIG. 2.

FIGS. 4 and 5 are plan views of the magnetic recording / reproducing apparatus of the present invention. FIG. 4 shows a state in which the projecting portion of the tape cassette 1 is pushed inward in the VTR 2 in an ejected state, and FIG. Cassette 1 is pulled into VTR 2,
This shows a state in which the cassette is mounted and fixed at a predetermined position (hereinafter, referred to as a cassette down state). FIG. 6 is a timing chart showing the rotation angle of the mode switch 3 as the operation mode detector and the state of conduction between the terminals.

The VTR 2 has a slot-in 4 as a tape cassette mounting mechanism, a main cam gear 5 as a cylindrical member that controls the operation of the slot-in 4 by being driven to rotate, and a reduction mechanism 6 that drives the main cam gear 5 to rotate. ,
A mode switch 3 as an operation mode detector for detecting an operation mode of the VTR 2 by detecting a rotation angle of the main cam gear 5 by engaging with a shaft of the main cam gear 5 and a chassis 7 to which these are attached. .

The slot-in 4 holds the tape cassette 1 and guide pins 8S, 8T, 9S, 9T, 1
0S, 10T, and engage with guide pins 8S, 9S, 10S of the cassette holder 11,
Side plate 1 having a plurality of guide grooves having similar functions
5S, guide pins 8T, 9T of the cassette holder 11,
10T, guide grooves 12T, 13T, which control the movement of the cassette holder 11 and the posture during the movement.
14T, a wiper arm 18S having a groove (not shown) for engaging a guide pin 8S passing through the side plate 15S, and a groove 16 engaging a guide pin 8T passing through the side plate 15T.
A wiper arm 18T having a gear T and a gear 17 and wiper arms 18S and 18T are fixed to each other in the same phase, and a synchronous shaft 19 rotatably attached to the chassis 7 by the side plates 15S and 15T;
A rack 20 which is slidably mounted linearly on T and meshes with a gear 17 of a wiper arm 18S at an end;
A drive rack 22 having an engagement pin 21 at the opposite end;
The drive arm 26 has a long hole 23 that loosely fits into the engagement pin 21, a rotation shaft 25 that fits in the cam follower 24 and a hole in the chassis 7, and is rotatably attached to the chassis 7. It is configured.

The main cam gear 5 has a gear 27 on its outer periphery which meshes with the reduction mechanism 6, and a cam follower 2 of the drive arm 26.
4 and a groove cam 28 which fits loosely into the hole of the chassis 7
The shaft 30 has a key-shaped portion 29 (FIG. 3) at the end.

The speed reduction mechanism 6 is controlled by a control circuit (not shown).
A forward / reverse rotatable loading motor 31, a worm gear 32 attached to its output shaft, a worm wheel gear 33 and a gear 34 meshing with the worm gear 32
Are formed coaxially, and a second reduction gear is formed integrally with a gear 36 meshing with the gear 34 and a gear 37 meshing with a gear 27 formed on the outer peripheral portion of the main cam gear 5. The driving force of the loading motor 31 is transmitted to the main cam gear 5 at a predetermined reduction ratio.

The mode switch 3 is composed of a rotor 40 having a key groove-shaped portion 39 to be fitted with the key-shaped portion 29 of the shaft 30 of the main cam gear 5, and a main body 45 having terminals 41, 42, 43, and 44, as shown in FIG. Rotor 4 as shown
According to the rotation angle of 0, the conduction of the terminals 41 and 42, the terminal 41 and the terminal 43, the conduction of the terminals 41 and the terminals 44 is switched, and the rotation angle of the rotor 40 can be detected.

With respect to the magnetic recording / reproducing apparatus configured as described above, first, a cassette loading operation for pulling the tape cassette 1 into the VTR 2 and fixing it at a predetermined position will be described.

In the state of FIG. 1, a part of the tape cassette 1 is V
The tape cassette 1 protrudes from the TR2 and can be attached and detached from outside the VTR2. At this time, the mode switch 3 is in the state where only the terminals 41 and 42 are conducting in the 0 ° state in the timing chart of FIG. 5, and it has been detected that the operation mode of the VTR 2 is in the eject state.

From this state, the tape cassette 1 is moved to the VTR 2
When the tape cassette 1 is pushed into the VTR 2 in the direction of the arrow C, the state shown in FIG. 4 is obtained.
゜ It turns to the rotating state, and the rotor 4 of the mode switch 3
1 is also rotated by 8 °, and the terminals 41 and 42, 41
When the tape cassette 1 is pushed in, it is possible to detect that the tape cassette 1 has been pushed in, since all the continuity between the terminal 41 and the terminal 43 and the terminal 41 and the terminal 44 are lost.

At this time, the pushing force of the tape cassette 1 depends on the idling torque of the loading motor 31 and the cassette holder 11 of the slot-in 4 from the loading motor 31.
, And the product of the transmission efficiency from the cassette holder 11 to the loading motor 31. By optimizing each of them, an optimal pushing force can be generated.

After detecting that the tape cassette 1 has been pressed, the loading motor 31 is rotated, and the first reduction gear 35,
The main cam gear 5 is rotated in the direction of arrow E via the second reduction gear 38. At this time, by the action of the groove cam 28 and the cam follower 24, the drive arm 26 is rotated in the direction of arrow G, and the drive rack 22 is linearly moved in the direction of arrow I, whereby the gear 17 meshing with the rack 20 is moved. Rotate
By rotating the wiper arms 18S, 18T in the direction of arrow K and moving the cassette holder 11 holding the tape cassette 1 in a predetermined posture along the guide grooves of the side plates 15S, 15T, the tape cassette 1 in the VTR 2 is moved. It can be moved and fixed to a predetermined position.

FIG. 5 shows this cassette down state. At this time, the main cam gear 5 is rotated by 80 ° from the ejected state in FIG.
゜ Rotate, only terminal 41 and terminal 43 conduct, VTR2
Can be detected that the operation mode is in the cassette down state. After that, the loading motor 31 is further rotated,
By stopping the rotation, the main cam gear 5 can be rotated and stopped, and the operation mode of the VTR 2 is set to the RE shown in FIG.
The mode can be switched to a V (review) mode, a PLAY / CUE (play / fast-forward) mode, or the like, to control the operation of a mechanism other than the slot-in 4 (not shown).

Next, the ejecting operation of the tape cassette 1 will be described. The loading motor 31 is rotated in the opposite direction to that during the cassette loading operation, and the main cam gear 5 is rotated.
Can be rotated in the direction of arrow F to shift the operation mode from the predetermined operation mode of the VTR 2 to the cassette down state and the eject state. From the cassette down state, with the rotation of the main cam gear 5, the drive arm 26 is rotated in the direction of the arrow H by the action of the groove cam 28 and the cam follower 24, and the drive rack 22 is linearly moved in the direction of the arrow J. By rotating the gear 17 meshing with the tape holder 1, the wiper arms 18S and 18T are rotated in the direction of arrow L, and the cassette holder 11 holding the tape cassette 1 is rotated.
Is moved from the cassette down state of FIG. 5 to the eject state of FIG.

During this movement, the state where there is no conduction between the terminals of the mode switch 3 is changed to the state where only the terminals 41 and 42 are electrically connected, and the loading motor 31 is stopped. However, the slot-in 4 during operation and the inertia of the loading motor 31 during rotation act, and cannot be stopped immediately, and the guide pin (not shown) on the opposite side corresponding to the guide pin 8T of the cassette holder 11 is guided by the side plate 15T. It stops by contacting the groove 12T with the terminal end of the guide groove (not shown) of the side plate 15S. At this time, the angle of the main cam gear 5 is 0 ° shown in FIG. 1, and the rotation angle of the mode switch 3 is also 0 °.

As described above, according to the present embodiment, the pushing of the tape cassette 1 is performed by the terminal 41 of the mode switch 3.
And the terminal 42 can be detected, thereby simplifying the configuration, simplifying the electrical control, and improving the response.

[0042]

As described above, according to the present invention, the pushing of the tape cassette is linked with the rotation of the mode switch.
Since the LED for detecting the start and end of the tape cassette is not used as in the related art, it is not necessary to turn on the LED when the tape cassette is ejected, so that a low-cost LED with a short life can be used.

At the same time, the electrically complicated control of blinking the LED at predetermined intervals can be simplified, and the LE
An excellent effect of improving the response by improving the delay in detecting the tape cassette press-in caused by the blinking of D is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing an ejected state of a magnetic recording and reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view showing an ejected state of the magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2;

FIG. 4 is a plan view showing a state where the tape cassette is pushed in the magnetic recording / reproducing apparatus according to the first embodiment.

FIG. 5 is a plan view showing the cassette down state.

FIG. 6 is a timing chart of a mode switch used in the magnetic recording / reproducing apparatus.

FIG. 7 is a plan view showing an ejected state of a conventional magnetic recording / reproducing apparatus.

FIG. 8 is a side view showing an ejected state of the conventional magnetic recording / reproducing apparatus.

[Description of Signs] 1 Tape cassette 2 Video tape recorder (VTR) 3 Mode switch 4 Slot-in 5 Main cam gear

Claims (1)

[Claims] At least three rotation angles, a first angle,
By changing the rotation angle to the second angle and the third angle,
A cylindrical member having a cam-shaped portion capable of controlling the operation of a mechanism in the device in accordance with an operation mode of the device; a change in a rotation angle of the cylindrical member from at least a first angle to a second angle; When the rotation angle of the cylindrical member is the first angle, a part of the tape cassette is projected outside the apparatus, and the operation mode detector is moved to a first position where the tape cassette can be attached and detached from the outside of the apparatus. When the tape cassette is moved and the protrusion of the tape cassette is pushed into the apparatus, the cylindrical member rotates to a second angle, and when the rotational angle of the cylindrical member is a third angle, the tape cassette is rotated. A magnetic recording / reproducing apparatus comprising a tape cassette mounting mechanism capable of holding a signal at a predetermined position in the apparatus at a second position where signals can be recorded / reproduced on / from a magnetic recording medium in the tape cassette.